Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152. |
QUEEN—Length 21-23 mm., breadth of abdomen 95-l1 mm.; black including legs, spurs and tegulae; wings quite uniformly, deeply infuscated, veins brownish to piceous; pubescence in general quite short but dense, black on head, yellow on scutum, scutellum, pronotum, and on pleura to bases of legs, scutum with a median, narrow, bare area which is fringed with a few short black hairs; pubescence black on venter of thorax and legs, very short on legs, but front and mid femora with posterior fringes of somewhat more elongate hairs, the corbicular fringe entirely black laterally and along the narrow apical margin, and terga 3-6 entirely black, hairs quite short but dense and suberect; clypeus closely and finely punctate laterally and above; the broad median area smooth and somewhat shining; labrum rather broadly rounded or subtruncate apically, with a pair of basal ridges separated medially by a rather broadly rounded concavity which is slightly elevated above the margin on each side, with an apical fringe of very short yellowish hairs; apex of mandible with a pair of slight notches near the upper angle, outer face toward base somewhat shining, with extremely minute, rather close punctures; malar space smooth and shining, without distinct punctures, somewhat shorter than basal width of mandible, about one-fifth length of eye; punctures of face fine and very close, becoming somewhat more distinct and more widely separated below ocelli, surface between lateral ocelli and eyes smooth and nearly impunctate; vertex finely and very densely punctate medially, punctures becoming somewhat more distinct but still close laterally; lateral ocelli slightly nearer eyes than to each other, distinctly below supraorbital line, slightly nearer each other than to margin of vertex; antennal scape somewhat more than half total length of flagellum, basal segment of flagellum only slightly shorter than segments 2 and 3 combined, 3 slightly longer than 2; posterior margin of hind basitarsus very slightly curved, median width slightly less than half the length; tergum 6 shining, very minutely punctate, narrowly rounded apically.
WORKER—Length 9.5-18 mm., breadth of abdomen 5-8.5 mm.; resembles queen except for the usual smaller size.
MALE—Length 15-19 mm., breadth of abdomen 6-7 mm.; black, legs and tegulae somewhat more reddish-piceous, spurs brownish-testaceous; wings rather lightly but uniformly infuscated, veins testaceous to piceous; apical margins of the abdominal terga very narrowly yellowish-hyaline; pubescence in general rather short and dense, largely pale yellowish on face above and below antennae and on clypeus, with scattered, erect, black hairs intermixed; vertex and occiput with intermixed yellowish and black hairs medially, cheeks with more fuscous hairs above, becoming yellowish below; scutum with a small median fuscous pubescent area posteriorly, and pleura with a few fuscous hairs above mid coxae, otherwise entire thorax densely yellow pubescent; all femora fringed beneath with elongate yellowish hairs, these becoming more fuscous on upper surface; tibiae largely blackish or fuscous pubescent, with posterior fringes of elongate hairs; and basitarsi with some elongate, dark hairs posteriorly, clothed beneath with short brownish hairs; basal abdominal tergum, and basal margin of tergum 2 medially, with erect, yellowish pubescence, remainder of terga 2 and all of 3-7 black pubescent, hairs very short, dense and suberect; clypeus finely and quite closely punctate beneath dense pubescence, but with a median, apical, shining, impunctate area; labrum broadly truncate, somewhat shining, especially on each side basally, with obscure, irregular and rather shallow, fine punctures; mandibles slender, bidentate apically, outer surface densely short pubescent, this yellow in part but fringed along lower margin with elongate fuscous hairs; malar space smooth and shining, with very minute, barely visible punctures, its median length about half basal width of mandible, only about one-tenth length of eye; face very narrow, eyes very slightly convergent above, lateral ocelli separated from eyes by less than half their diameter, and much below supraorbital line, nearer to each other than to margin of vertex; facial punctures very fine and close beneath dense pubescence, becoming rather sparse on shining surface below ocelli, punctures of vertex medially quite deep and distinct but close, becoming somewhat finer laterally; basal segment of flagellum subequal to segment 3, segment 2 considerably shorter; hind tibiae shining, somewhat convex, very sparsely punctate, basitarsi elongate and parallel-sided; sterna 7 and 8 and genital armature as shown (fig. 132).
DISTRIBUTION—Quebec and Maine to Florida, and throughout the West, February to August.
FLOWER REORDS—Apocynum, Aronia, Asclepias, Ceanothus, Chamaecrista, Cirsium, Eryngium, Helenium, Helianthus, Hypericum, Ilex, Itea, Malus, Pontederia. Rhus, Rubus, Silphium, Solidago, Vaccinium and Vicia. Robertson (1929) gives the following additional records: Abutilon. A cerates, Actinomeris, Aesculus, Agastache, Amorpha, Arabis, Asclepias, Aster, Astragalus, Baptisia, Bidens, Blephilia, Brauneria, Camassia, Campanula, Cassia, Caulophyllum, Ceanothus, Cephalanthus, Cercis, Cirsium, Collinsia, Cornus, Crataegus, Delphinium, Dentaria, Desmodium, Diantliera, Dicentra, Diospyros, Dodecatheon, Erigeron, Eryngium, Eupatorium, Fras era, Gerardia, Geranium, Gleditzia, Helenium, Helianthus, Hibiscus, Hous tonia, Hydrangea, Hypericum, Hydrophyllum, Ipomoea, Iris, Krigia, Liatris, Lobelia, Lythrum, Marubium, Melilotus, Mertensia, Monarda, Nelumbo, Nepita, Pastinaca, Pentstemon, Petalostemon, Phlox, Podophyllum, Polemonium, Prunellct, Prunus, Psoralea, Pycnanthemum, Pyrus, Rhus, Ribes, Robinia, Rosa, Rubus, Rudbeckia, Saici, Seutllaria, Silphium, Siyrinchiurn,
SoZidctga Specularia, Symphoricarpus, Taenidia, Teucrium, Tradescantia, Trifolium,
Verbena, Vernonia, Viburnum, Viola, Vitis, Uvularia and Zizia.
Extracted from Bumble Bees and Cuckoo Bumble Bees of California by Thorp, R. (1983). |
Apis griseocollis Degeer, 1773, Mem. Serv. Hist. Insectes, 3:576 w. Lectotype w, no locality (Natl. Riksmus., Stockholm, Sweden) (selected by Milliron, 1960).
Map 2, Nearctic distribution of Bombus griseocollis.
Geographic range (Map 2). Southern Canada and most of the United States, except the southwestern states; Maine to Florida W to British Columbia and northeastern California.
California records. MODOC Ca: CedarviOe; Davis Creek; Fan¬dango Pass; NewelL SHASTA Ca: McArthur, and 11 km E. Stsu. YOU Ca: Copco; Etna; Gazelle, 5 km N; Lower Klamath Lake; Montague, and 16 km NE; Yreka, SkroW.
Seasonal flight period (Fig. 2). QUEENS (86): late March to early October. WORKERS (357): late April to late September. MALES (307): late June to early October.
Flower records. QUEENS (17): Compositae 41%; Leguminosae 35%; Asclepiadaceae 12%; Rosaceae 12%. WORKERS (137): Leguminosae 45%; Compositae 29%. MALES (106): Compositae 75%; Leguminosae 19%. Total: 260 in 13 families with 29 genera as follows: Althaea: 4w, lrn; Asdepku: 2q, 8w; Borago: lw; Bmnnkhkt: 4w; Caragana: lq; Cercis: lq; Chrysothamnus: lOw, 24m; Cbsium: lq, 3w, 9m; Convolvulus: 2w, Gossyphm: 4w, Helkmthm: 2q, 25w, 42m; Lotus: lw, Medkago: 2q, 27w, lm; Melihtus: 25q, 18m; Mentha: lm; Monarda: 3w, Petakatemon: lw, Pontederta: lw, 2m; Prunus: lq; JPycnanthemm: 3w, 2m; fyrrhopappus: lw, /fas: 2w; Robinia: lq; /tuba: lq, lw, Sato/a: lw, SoUdago: lq, lw, 4m; Trifblhan: lq, 8w, lm; Kerfemi; iw; Wyethia: 3a.
Discussion. B. griseocollis is most closely related to £. morrisoni. Its females are readily recognized by the yellow hair on the pleura and black hair on metasomal tergite 3 (cf. Figs. 133, 134). Males can be distinguished from morrisoni by the apices of the penis valves, which are short, abrupt, and curved mesad but not recurved (cf. Figs. 35b, 36b).
This species is rare in California and occurs prin-cipally in the northern transmontane area. Most of the flight and flower records are based on data from specimens collected outside the state.
The biology of this species is discussed by Plath (1927, 1934) and Medler and Carney (1963). The perching habit of males is mentioned by Plath (1934). In southern Michigan, RWT observed males perching and darting out at approaching insects or small objects tossed near them and returning to their original perch.
Extracted from: Laverty T.M., & Harder L.D., (1988). The Bumble Bees of Eastern Canada. Can. Ent. 120: 965-987.
Description. Body size of all castes medium to large. Head broadly rounded with malar space approximately two-thirds as long as wide in female, and one-third as long as wide in male. Tongue length medium. Eyes enlarged and bulging in male. Colour pattern as in Figure 4. The yellow pile often faded to tawny-brown. In some specimens brown pile on T2 extended to lateral margins; brown pile on T2 occasionally yellow.
Extracted by H. E Milliron. A Monograph of the Western Hemisphere Bumblebees (Hymenoptera: Apidae; Bombinae) II. The Genus Megabombus Subgenus Megabombus. The Entomological Society of Canada, Ottawa 1970. pp. 239-330.
Description. Queen. Length, 21.0 mm; width at wing bases, 10.0 mm; abdomen, 11.0 mm, width across T2, 11.0 mm; front wing length, 17.5 mm, width, 6.0 mm. Head: Frontal outline (excluding mouthparts) trapezoidal except evenly rounded over temples, the vertex weakly arcuate to nearly straight across, the widest part about equal to the median height; vertical region nearly flat and weakly inclined toward occiput, mostly covered with small irregular punctures; ocular half of ocellocular area with few small and medium punctures, the ocellar half largely smooth; compound eyes somewhat more broadly rounded below than above, their inner margins nearly parallel except slightly converging above; ocelli rather large, situated in a weak arc distinctly below the supraorbital line, separated from one another by only about \ their diameters, the interocellar line distinctly greater than the ocellocular line; malar space rather short, only about f as long as the distance between (and including) mandi bular articulations, mostly weakly convex and with few microscopic punctures; labrum more than twice as wide as its greatest thickness, its ventral margin rather evenly arcuate, the labral shelf not very sharp or prominent and extending transversely not much beneath the tubercles which are subconical and mostly irregularly punctate, their inner summits separated by an intertubercular depression that is at least as wide as the length of the first flagellar segment; flagellum only slightly longer than scape, FI nearly equal to combined lengths of F2 and F3,
the latter distinctly longer than quadrate F2; clypeus rather evenly but not strongly convex, little wider near its base than its median height, moderately well but not densely covered with mostly small punctures. Legs: Mesobasitarsite subrectangular, about 4 times longer than widest part, its outer surface nearly flat, the blunt distoanterior angle and somewhat sharper disto posterior angle about equally extended with a shallow emargination between; outer surface of hind tibia mostly minutely granulose with a weak longitudinal convexity anteriad of the middle, behind for the most part shallowly concave to nearly flat; metabasitarsite subrectangular with its outer surface shallowly concave longitudinally, its posterior margin evenly arcuate from base to distal end, the acute distoposterior angle extended somewhat beyond the blunter disto anterior angle with a shallow emargination between. Pubescence: Short, dense, and rather even except somewhat longer posteriorly on the scutellum and abdomen; hairs of the posterior fringe of mesobasitarsite mostly straight, longest basally and gradually becoming very short at the distal end; metabasitarsal posterior fringe comparatively shorter, most hairs being slightly
arcuate, longest along the basal half and gradually becoming very short beyond. Color: Head (except for traces of intermixed drab yellow on most of face and vertex), the innermost thoracic venter, most of the distal half of abdominal T2 and all of T3-6, abdominal venter and legs black, remainder of thorax (except for few intermixed blackish hairs at the very center of disc), abdominal T1 and a wide more or less proximal patch on T2 tawny yellow (often this patch is very drab yellow or even light reddish brown; cf. under Comments), wings infumated with reddish brown to blackish, usually darker beyond the venation especially
the front wings.
Worker. Length, 13.0 mm; width at wing bases, 6.5 mm; abdomen, 6.0 mm, width across T2, 6.5 mm; front wing length, 17.0 mm, width, 4.0 mm. Except for its smaller dimensions this caste is similar to the queen in all respects except (often) the wings are more evenly infu mated and slightly paler.
Male. Length, 14.0 mm; width at wing bases, 8.0 mm; abdomen, 7.0 mm., width across T2, 7.0 mm; front wing length, 14.0 mm, width, 5.0 mm. Head: Frontal outline (excluding mouthparts) roundly trapezoidal, distinctly wider through the widest part than the median height, the occiput transversely straight; vertical region nearly flat and for the most part covered with small irregular punctures; ocellocular area narrow, irregularly convex, and largely devoid of punctures; compound eyes bulging, almost evenly rounded below and above, their inner margins subparallel; ocelli large, situated in a weak arc far below the supraorbital line, close together, the ocellocular line being about twice as great as the interocellar line; malar space very short, only about i as long as the distance between (and including) manibular articu lations, transversely weakly convex and with few small irregular punctures; labrum nearly twice as wide as its greatest thickness, its ventral margin straight except arcuate at the corners, mostly irregularly punctate, the callosities only moderately prominent and not separated by any deep depression; flagellum nearly 3 times longer than scape, FI equal to F3, the latter about li times longer than rectangular F2. Legs: Mesobasitarsite elongate-rectangular, little more than 4 times longer than widest part, which is little more than i the length of longest basal hairs of the posterior fringe, the outer surface longitudinally only weakly concave, the distal end subtruncate with the distoanterior angle extended only slightly beyond the disto- posterior one; metabasitarsite rectangular, its average width much less than the length of longest hairs of the posterior fringe, its outer surface nearly flat, the distal end subtruncate.
Pubescence: In density and length similar to that of female, somewhat finer throughout. Meso- basitarsal posterior fringe composed of a mixture of short and medium long hairs on the basal third, beyond becoming very short distally; metabasitarsal posterior fringe mostly com posed of rather long and shorter hairs on the approximate proximal two-thirds, beyond becoming shorter. Genitalia and seventh and eighth abdominal sterna (PI. XVI). Color: Head with the face and vertex predominantly tawny yellow with some black intermixed, the genae and temples black or largely so (sometimes with considerable yellow); thorax tawny yellow (usually) with some black on the center of disc; abdominal T1 tawny yellow, T2 (usually) with an arcuate basal patch even more tawny to reddish brown (cf. under Comments), the abdominal venter usually predominantly black or blackish but often with considerable tawny yellow or mostly so; legs largely black but femora usually with at least some tawny yellow especially on the ventral surfaces. Wings evenly infumated but somewhat more lightly so than the wings of the queen.
Comments. Structurally this species shows very little variation. However, chromatically it does vary considerably especially with respect to the shade and extent of yellow on the head, thorax, and abdomen; usually it is drab or tawny but often all the yellow is quite pale. The amount and color of the lighter pubescence on abdominal T2 is very variable ranging from a rather narrow arcuate basal patch to one that enlarges to virtually cover most of this tergum; its shade might be concolorous with the yellow on the thorax but usually it is more tawny with at least a reddish cast to reddish brown. Sometimes abdominal T3, which is normally black, will have traces of yellow at the extreme sides. These latter remarks encompass the form described as a species, mormonorum, by Franklin (1911: 161) which was correctly placed in the synonymy of griseocollis by Stephen (1957: 50). Often the light abdominal pubescence especially on the male is pallid yellow or whitish. The color of this species varies to the extent of being aberrant for I have before me a queen (Rock Co., Minn.) which on ab dominal T2 there is a median yellowish arcuate patch, the basal corners are mostly black and the remainder of this tergum as well as all of T3 (except for the inter mixture of some black at its basal corners) is rufous; also before me is a male
(Minneapolis, Minn.) which has a few intermixed reddish yellow hairs along the distal margin of abdominal T2, a more conspicuous amount of the same color along the distal third of T3, and all except the bases of T4-5 is of this reddish yellow.