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Bombus crotchii Cresson, 1878
Bombus nigrocinctus Provancher, 1888; Bremus crotchii var nigricaudus Frison, 1927

Life   Insecta   Hymenoptera   Apoidea   Apidae   Bombus
Subgenus: Cullumanobombus

Bombus crotchii, female, face
Smithsonian Institution, Entomology Department · 9
Bombus crotchii, female, face

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Bombus crotchii, female, side
Smithsonian Institution, Entomology Department · 9
Bombus crotchii, female, side
Bombus crotchii, female, top
Smithsonian Institution, Entomology Department · 9
Bombus crotchii, female, top

Bombus crotchii, female, wing
Smithsonian Institution, Entomology Department · 9
Bombus crotchii, female, wing
Bombus crotchii, Robyn Judith Waayers
Robyn Judith Waayers · 1
Bombus crotchii, Robyn Judith Waayers

Bombus crotchii, Robyn Judith Waayers1
Robyn Judith Waayers · 1
Bombus crotchii, Robyn Judith Waayers1
Extracted from Jonathan Koch, James Strange,Paul Williams.2012. Bumble Bees of the Western United States. A product of the U.S. Forest Service and the Pollinator Partnership with funding from the National Fish and Wildlife Foundation

Crotch bumble bee

Status: Uncommon

Select food plant genera: Antirrhinum, Phacelia, Clarkia, Dendromecon, Eschscholzia, Eriogonum

Tongue Length: Medium

Distribution: Exclusive to coastal California east towards the Sierra-Cascade Crest; less common in western Nevada

Can be confused with B. caliginosus, B. occidentalis, and B. vandykei

Thorax anterior to black between wing bases yellow, scutellum black, T1 black at least medially, T2 predominantly yellow, T3-5 red or black, face square.

Mid leg basitarus with the distal posterior corner rounded. Cheek length as long as broad. Hair of the face and top of head black. On the side of the thorax, the lower anterior surface with long black hairs, corbicular fringes black.

Extracted from Bumble Bees and Cuckoo Bumble Bees of California by Thorp, R. (1983).

Bombus crotchU Cresson, 1878, Proc. Acad. Nat Sci. Phila., p. 184. q. Lectotype q, California (#2168 ANSP) (selected by Cresson, 1916). Geographic range (Map 4). Central California to Baja CaliforČnia del Norte, Mexico. California records. ALAMEDA CO.: Berkeley, Pteasanton; San Leandro. CONTRA COSTA CO.: Antioch; Moras*; ML Diablo. FRESNO CO.: Coalinga, 6.5, 11, and 23 km W; Firebaugh, 10 km NW; Five Points; Fresno; Huntington Lake; Jacolitos Canyon; Little Panoche Canyon; Mercey Hot Springs, 8 km E; Orange Cove, 6.5 km N; Oxalis; Panoche; Parlier, Piedra; Trimmer, 11 km SW and 27 km E; Trimmer Springs; Walts Valley. GLENN CO.: Artois; Orland. IMPERIAL CO.: Brawley. INYO CO.: Haiwee; Lone Pine; Owens Lake; Pine Creek. KERN CO.: Arvim Bakersfield, and 24 and 29 km E; Caliente, 5 km S; Camelo JcL; Cummings Valley; Frazier Park, 2 km S; Fort Tejon; Kern Canyon; Keraville; Lebec; McFarland, 14 km E; McKittrick, 16 km E; Mill Potrero; Mojave, 13 km W; Rosamond; Shafter, Tart; Tehachapi, and 39 km W; Wheeler Ridge; Woody. Los ANGELES Co.: Altadena; Azusa, 5 km N, San Gabriel Canyon; Baldwin HQIs; Big Pines, Angeles NatL For.; Big Rock Public Camp, Angeles Natl. For.; Castak. 16 km N; Claremont; Devils Gate Dam, Flint Ridge; El Segundo; El Segundo Sand Dunes; Glendale; Gorman, and 6 km E; Griffith Park; Jonsons Peak; Litucrock; Llano, and 8 km SE; Los Angeles; ML San Antonio; Newhall; Pasadena; Palmdale; Pomona; Santa Monica; Tanbark Flat; Walnut; Westwood Hills; Whittier. MADERA CO.: Nipinnawasee; San Joaquin Experimental For. MARIPOSA Ca: Exchequer Dam; Wawona. MERCED Ca: Delhi, 3 km S; Dos Pakw; Livingston; Merced Falls, 6 km SE; West Panoche Hills. MONTEREY Ca: Arroyo Seco Camp; King City, 14 fan E; Soledad. ORANGE Ca: Costa Mesa; Laguna Beach; Newport Beach; Santa Ana; Yorba Linda. RIVERSIDE Ca: Ansa, 6 km W; Banning; Corona; the Gavilan, 610 m; Hemet; Magnesia Canyon; Palm Springs; Penis, and 2 km W; Sage, 10 km W; Sunnymead, 13 km E; Temecula. SACRAMENTO Ca: Sacramento. SAN BENITO Ca: Bitterwater, 8 km S; Idria, 10 km SE SAN BERČNARDINO Ca: Bear Valley; Bloommgton; Cushenbury Spring, San Bernardino Mtns., 1220 m; Kramer Hills; Loma Linda; Mojave River, near Deep Creek, Mojave Desert; Morongo ValČley; Ontario; Phelan; Seeley Flat, San Bernardino Mtns.; Sidewinder Well, Mojave Desert; VerdemonL SAN DIEGO Ca: Anza-Borrego State Park; Banner, 5 km E; Borrego; Carbbad; Encinitas; La Mesa; Lake Henshaw; Ramona; Santa Ysabel; Spring Valley; Warner Ranch; Warner Springs. SAN JOAQUIN Ca: Tracy. SAN LUIS OBSTO Ca: Atascadero; Paso RoMes; Pozo, 16 km E; Sbandon, 11 km SW. SANTA BARBARA Ca: Aliso Canyon, 10 km SW New Cuyama; Cachuma Lake, 5 km W; Carpenteria; Cuyama; Cuyama Valley, Goleta; San Marcos Ranch Hdqtrs., Santa Inez Mtns.; Santa Barbara; Santa Rosa bland. SANTA CLARA Ca: Palo Alto; San Antonio Valley, San Jose. SONOMA Ca: Cloverdate; Sonoma. STANISLAUS Ca: Newman; Patterson; Turteck, and 16 km E. TEHAMA Ca: Red Bluff. TULARE Ca: Ash Mt, Sequoia NatL Park; Bubbs Creek; Idtewild; Kaweah; Kings Canyon; Lemoncove; Mineralking; OrosU Porterville; Sequoia NatL Park; VTsalia; Woodlake. TUOLUMNE Ca: JamesČtown; Oakland Recreation Camp; Rawhide. VENTURA Ca: Camarino; Hungry Valley, 8 km S Gorman; ML Pinos; Ojai; Santa Paula, Ventura. YOLO Ca: Davis. Seasonal flight period CRg. 4). QUEENS (225): late February to late October. WORKERS (349): late March to late October. MALES (122): late May to early September. Fbwer records. QUEENS (50): Leguminosae 36%; Labiatae 12%; HydrophyUaceae 10%. WORKERS (95): Leguminosae 36%; Asdepiadaceae 24%; Compositae 14%. MALES (41): Asdepiada-ceae 54%; Leguminosae 22%; Compositae 22%. Total: 186 in 15 families with 33 genera as follows: Amstndda'. 4q; Asckptas: 2q, 23w, 22m; Astragaha: 5q; Brassta: 3q, lw, Chaenactis'. lq, llw, Delphinium: 2w, Eriodkffon: 2w; Eriogonum: 3w; Eschschohki: 3q, 5w; Gutierrezta: lw; HeUanthm: 6m; Hemitonia'. 2m; Hypericum: lw; Isomerb: 3q; Lantana: lq; Lamyna: lq, lw; Lepldospartum: lm; Lofta: 6w, lm; Luplmts: 6q, 92; Medkago: lq, 16w, 7m; Oenothera: lq; Orthooatpta: lq; Parkinsonia: lq; Penstemon: 7w, PhaceUa: 5q, 2w; Raphama: lq; Sofofe: 5q, 2w; SoUdago: lq, lw; Triehostema: lq; Trtfbmim: lq, lm; Wefa: 2w; Hfefcenfa: lm; Wfrfcrfa: 3q. Discussion. B. crotchit appears most closely related to members of the subgenus Separate bombus. It can be separated from them by the charČacters given in the subgeneric diagnoses. The queen which Cockerell named 5. cro&fcff semisuffitsus is actually a female of 2?. nevadensis (see discussion for that species). Other infraspecific names represent extremes of infrapopulation color variants and do not merit subspecific rank. Most color variation occurs in the amount of reddish hair on the apical metasomal tergites. In both sexes, reddish hair may be present on all tergites from the apex of tergite 3 to the last tergite, or replaced by black hair on one or all of these. Replacement by black hairs occurs from anterior to posterior.

Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apocynaceae  Asclepias eriocarpa @ EMEC (7)

Asclepias fascicularis @ LACM_ENTB (3); EMEC (21)

Asclepias speciosa @ AMNH_BEE (8)

Asclepias @ UCRC_ENT (1); LACM_ENTB (3); EMEC (4)
Asteraceae  Centromadia pungens @ LACM_ENTB (1)

Chaenactis fremontii @ UCRC_ENT (3)

Chaenactis @ EMEC (8)

Ericameria @ LACM_ENTB (1)

Gutierrezia sarothrae @ UCRC_ENT (1)

Helianthus annuus @ EMEC (1); AMNH_BEE (2); LACM_ENTB (4); UCRC_ENT (3)

Lepidospartum squamatum @ LACM_ENTB (1); EMEC (2)
Bignoniaceae  Chilopsis linearis @ LACM_ENTB (1)
Boraginaceae  Amsinckia douglasiana @ UCRC_ENT (1)

Amsinckia @ EMEC (1)

Eriodictyon crassifolium @ UCRC_ENT (1)

Eriodictyon @ EMEC (2)

Heliotropium curassavicum @ UCRC_ENT (1)

Phacelia ramosissima @ LACM_ENTB (1); UCRC_ENT (2)

Phacelia tanacetifolia @ UCRC_ENT (1)

Phacelia @ LACM_ENTB (2)
Brassicaceae  Brassica rapa @ LACM_ENTB (3)

Brassica @ EMEC (1); LACM_ENTB (2)
Capparaceae  Wislizenia refracta @ AMNH_BEE (1)
Cleomaceae  Peritoma arborea @ EMEC (3)
Cucurbitaceae  Cucurbita @ EMEC (1)
Fabaceae  Acmispon americanus @ UCRC_ENT (3)

Acmispon glaber @ LACM_ENTB (1); UCRC_ENT (2); EMEC (1)

Astragalus douglasii @ UCRC_ENT (4); EMEC (1)

Lotus @ BMEC_ENT (1)

Lupinus excubitus @ UCRC_ENT (3)

Lupinus formosus @ UCRC_ENT (1)

Lupinus @ LACM_ENTB (1); UCRC_ENT (1); EMEC (10)

Medicago sativa @ EMEC (27); AMNH_BEE (1)

Parkinsonia @ CSCA (1)

Trifolium @ EMEC (1)

Vicia villosa @ BMEC_ENT (2)

Wisteria @ EMEC (3)
Hypericaceae  Hypericum perforatum @ BMEC_ENT (1)
Lamiaceae  Hyptis @ LACM_ENTB (2)

Marrubium @ LACM_ENTB (1)

Salvia apiana @ UCRC_ENT (1)

Salvia carduacea @ UCRC_ENT (5)

Salvia columbariae @ UCRC_ENT (1)

Salvia mellifera @ UCRC_ENT (1)

Salvia polystachya @ UCRC_ENT (1)

Salvia sp @ BBSL (1)

Salvia @ EMEC (9); BMEC_ENT (1); LACM_ENTB (4)

Trichostema lanceolatum @ UCRC_ENT (1)
Oleaceae  Olea @ LACM_ENTB (1)
Orobanchaceae  Cordylanthus @ UCRC_ENT (1)

Orthocarpus @ EMEC (1)
Papaveraceae  Eschscholzia californica @ UCRC_ENT (7)

Eschscholzia @ EMEC (1)
Plantaginaceae  Keckiella antirrhinoides @ UCRC_ENT (6); LACM_ENTB (1)

Keckiella rothrockii @ LACM_ENTB (2)
Poaceae  Bromus @ EMEC (2)
Polygonaceae  Eriogonum fasciculatum @ LACM_ENTB (2)

Eriogonum umbellatum @ BBSL (1)

Eriogonum @ UCRC_ENT (1); EMEC (1)
Ranunculaceae  Delphinium @ UCRC_ENT (1)
Rhamnaceae  Ceanothus @ LACM_ENTB (1)
Salicaceae  Salix lasiolepis @ LACM_ENTB (2)
Verbenaceae  Lantana montevidensis @ UCRC_ENT (1)

Lantana @ UCRC_ENT (1); AMNH_BEE (1)
Zygophyllaceae  Larrea tridentata @ LACM_ENTB (1)
_  Withheld @ BBSL (35)

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Bombus crotchii
Bombus crotchii
Bumble Bee
ID: 0000 0000 0504 0426 [detail]
© 2004 Tom Greer tbphotos@comcast.net

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