378 AMERICAN HYMENOPTERA. 



Bombus oregonensis Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 



230. (Catal.). 

 ? " sitkensis Dalla Torre, Ber. naturw.-mediz. Ver. Innsbr., XII, 

 1882, p. 23, n. 19, cf . 

 " oregonensis Cresson, Syn. Hym. No. Amer., 1887, p. 308. 

 " sitkensis Cresson, Syn. Hym. No. Amer., 1887, p. 308. 

 '• " Ant. Handlirsch, Ann. naturh. Hofmus. Wien., Ill, 



1888, p. 232. 

 " oregonensis Dalla Torre, Cat. Hym., X, 1896, p. 538. 

 " sitkensis Dalla Torre, Cat. Hym., X, 1896, p. 549. 

 " mixtuosus Ashmead, Proc. Wash. Ac. Sci., IV, May 29, 1902, 

 p. 128, 9 a . 

 Ashmead, Hym. of Alaska, 1904, p. 134, 9 8 . 

 ? " " Viereck, Can. Ent., XXXVI, April, 1904, pp. 98 



and 99. 

 ? " oregonensis Viereck, Can. Ent., XXXVI, April, 1904, pp. 98 

 and 99. 

 " sitkensis H. Friese, Ann. du Mus. Zool. de I'Acad. Imp. des 



Sci. de St. Petersb., 1904, tome IX, no. 4. 

 " " Fletcher and Gibson, Can. Ent. Rec. (Ann. Rep't 



Ent. Soc. Ont.), 1908, p. 111. 



Types. — Nylander's specimens are probably lost. The type 

 of oregonensis Cress, is in the collection of the American 

 Entomological Society. The type specimens of mixtuosus 

 Ashmead are in the collection of the United States National 

 Museum. 



Pile rather long and fine. Females with face, occiput and dorsum of 

 thorax bearing mixed black and yellow pile, the scutellum being darker 

 than the anterior part of the dorsum; mesopleura pale yellow ; abdomen 

 with dorsum, yellow at base, dark in the middle and more or less whitish- 

 ferruginous at the apex ; corbicular fringes ferruginous ; wings light; 

 malar space medium. Males much like the females, but with pile of 

 head and thorax mostly pure yellow. A dull looking species. 



Queen. Head.—¥a.cQ often with a patch of pure yellow pile (some- 

 times whitish and sometimes ferruginous) , but usually with more or 

 less dark hair admixed. Occiput always with dark and light pile mixed. 

 Cheeks mostly dark, but the ventro-lateral portions often with some 

 light hair. Labrum with tubercle-like areas large and not very widely 

 separated, their margins rounded and summits only slightly concaved ; 

 the region between these areas and above the shelf-like projection 

 rather deeply excavated ; the shelf-like projection rather narrow and 

 not prominent. Malar space somewhat longer than its width at apex, 

 about one-fourth as long as the eye. Clypeus with disc rather sparsely 

 and delicately punctate, the corners coarsely punctate. Flagellum of 



