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|
Morrison bumble bee
Select food plant genera: Cirsium, Cleome, Helianthus,
Lupinus, Chrysothamnus, Melilotus
Tongue Length: Short
Distribution: Sierra-Cascade Crest east to the Intermountain
West and to South Dakota and south into Mexico; associated
primarily with arid environments
Can be confused with B. griseocollis
Thorax and T1-2 yellow, T3 yellow at least medially,
T4-5 predominantly black, face round.
Mid leg basitarsus with the distal posterior corner
rounded. Cheek length distinctly shorter than broad.
Hair of the face black and top of head yellow. On the
side of the thorax, the lower anterior surface with
medium black hair, corbicular fringes black. Hair
length short and even.
Extracted from Wallace E. LaBerge and Morgan C. Webb. (1962). The Bumblebees of Nebraska (Hymenoptera, Apidae, Bombinae). University of Nebraska College of Agriculture.|
This western species is rare in Nebraska. It has been colleCled only in the westernmost counties oC the Slate.
Females: H ead wilh hairs black except vertex with pale hairs medially; thorax with sides black except posterior pronotal lobes with yc llow pile and occasion:l ll y some yellow pile below and surrounding prono!.al lobcs: tcrga I and 2 with yellow pile; tergum 3 with pile cntirely yellow or yc llow ITIcdiobasally and black apica lly; tcrgum 4 with black or, in spccimens with tergulTI 3 entirely ycllow, ycllow llIediobasall y: terga :) and G black; leg hairs black: malar space with length subefJual LO width; ocelli placed sliglllly below supraorbital line.
1\1alcs: H ead hairs ycllow with area belween apices DC compound cyes usuall y with black hairs; thorax with sides black except posterior pronolal lobcs and ortcn area surrounding pronolal lobes yellow, dorsum ell t.irely yellow; tcrga 1 and 2 with ycllow pile; tergum 3 with yd low pile: tergum 'I wi Lh black pile or ye llow mcd iobasall y: terga 5-7 with black pile: leg hairs black: Olilcr surraces hind tibiae with medioapical area bare and impuncL < He; malar spacc much shon eI' than bro< ld ; compound cyes Illllch swollen; occlli placcd well below supraorbital line; rirsl rlagclIar segmcnl subequal to third and much longer I han second.
Extracted from Bumble Bees and Cuckoo Bumble Bees of California by Thorp, R. (1983). |
Bombus morrisoni Cresson, 1878, Proc. Acad. NaL Sci. Phila., p. 183. q, w, nf. Lectotype q, Colorado (#2632 ANSP) (selected by Cresson, 1916).
Geographic range (Map 3). W of 100° longitude, western South Dakota S to New Mexico and W to southern British Columbia, Canada, and S to Sonora, Mexico.
California records. ALPINE Ca: Carson Pass; Leviathan Peak, 2710 m; Woodfords. INYO Ca: Alabama Hills; Big Pine, and 5 km E and 6.5 km S; Bishop, 16 km N; Deep Spring Lake; Independence; Lone Pine; Mazourka Canyon; Oak Creek; Onion Valley, Inyo NatL For.; Panamint Mtns.; Silver Canyon, White Mtns.; Surprise Canyon; Westgard Pass; Whitney Portal;
BUMBLE BEES AND CUCKOO BUMBLE BEES OF CALIFORNIA 21
Wyman Canyon, White Mtns. LASSEN CO.: Honey Lake, Janes-vilte; Slandish, 6.5 km W. MODOC CO.: Cedar Pass; Jumper Flat; Lake City, Newell; Saddleblanket Flat. MONO CO.: Benton; Bridgeport; Convict Lake; Crestview, 13 km S; Crooked Creek, While Mtns.; Crowley Lake; Grant Lake; Mill Creek; Monitor Pass; Mono Lake, 16 km N Lee Vining; Pickel Meadows; Rock Creek; Tom's Place; Topaz Lake. NEVADA CO.: Truckee. PLUŽMAS Co.: Blairsden; Keddie, 3 km W. SHASTA CO.: Hat Creek P.O. SIERRA Co.: Sierraville. SISKIYOU CO.: Montague; Scott Bar; Tule Lake. TUOLUMNE CO.: Sonora Pass.
Seasonal flight period (Fig. 3). QUEENS (158): early March to late September. WORKERS (521): early June to late September. MALES (230): early July to late October.
Flower records. QUEENS (25): Composite 36%; Crucifcrac 24%; Gentianaccae 12%. WORKERS (163): Composite 32%; Leguminosae 16%; Ranunculaceae 12%; Capparidaceae 11%; Labiatae 10%. MALES (120): Compositae 96%. Total: 308 in 15 families with 32 genera as follows: Althaea: lq, 7w, Asckpias: 6w, Aster. 9m; Astragalus: lq; Babamorhim: lw, Brasska: lq; Chrysothamnus: lq, Uw, 26m; Clrshm: 7q, 15w, 12m; Ckome: 18w, Dalea: 4w; Delphinium: 20w; Eriogonum: lw, Frasera: 3q, 3w, GaiUardia: lw; Geranium: lm; Gutkrraia: lw, 2m; Heknhan: 3w; Hetianthus: 15w, 62m; Manubium: 7w, lm; Medh cago: 14w; Melilotus: 4w; Memtelia: 2q, 10w, Monarda: lw. Pen-station: lw. Salvia: 8w, lm; Senedo: 5w, 4m; Solatium: 2w, Sphaerakea: lq, lw, 2m; Stankya: Sq; Tamartx: 2q; Taraxacum: lq; Trifblium: 4w.
Discussion. B. morrisoni is most closely related to B. griseocollis and may be distinguished from it by
the characters mentioned in the discussion under that species.
This species occurs principally in transmontane California. Three California specimens are not listed in the above records because of the improbŽable validity of the data associated with them. The putative localities include Davis, Yolo Co.; Ahwahnee, Madera Co.; and Yosemite Valley, Mariposa Co. None of these localities have proŽduced additional specimens, and even if the bees were collected where the labels indicate, they may have been accidental introductions without species establishment and therefore of little biogeographical importance.