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.