HENRY J. FRANKLIN. 413 



Genitalia. — Branches of claspers (figs. 73, 82 and 83) short 

 and very broad and square at apical end as seen from dorsal 

 side ; volsellae columnar, squarish at apex and of nearly even 

 width from about the ends of the branches to their apices ; 

 squamae very long and unevenly divided, the inner lobe 

 being a mere tooth at the base of the outer one ; heads of 

 sagittae very narrow, straight, elongate, with thin, strongly 

 serrate outer borders and with tips recurved ventrad ; shafts 

 of sagittae straight ; uncus unusually broad, especially the 

 basal portion. 



Bonibus (Bombias) auricomus (Robertson). 

 ? Apis pennsylvanica De Geer, Mem. Hist. Insects, III, 1773, p. 575, n. 



8; T. 28, F. 12, 9. 

 Bonibus pennsylvanicus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 94, 

 n. 11, 9 (pars.), S (pars.) and cf . 

 Robertson, Ent. News, I, 1890, p. 40. 

 " nevadensis Ant. Handlirsch, Ann. Naturh. Hofmus. Wien., 

 Ill, 1888, p. 245, cf; T. 10, figs. 3 and 11. 

 Bontdias aurtcontus Kohertson, Trans. Amer. Ent. Soc, XXIX, 1903, 



pp. 176 and 177, 9 S c?. 

 Bomb us nevadensis Howard, Insect Book, 1904, Plate II, fig. 3, cf. 

 Bombi as auricomus Viereck, Trans. Amer. Ent. Soc, XXXII, July, 

 1906, p. 240. 

 Swenk, Ent. News, XVIII, July, 1907, p. 295, n. 3. 

 Bombus auricomus Cockerell, Univ. Color. Studies, IV, 1907, p. 257. 



Types. — I have not seen the specimens from which this 

 species was described. They are probably still in Mr. 

 Robertson's private collection. 



Fe'inales with face dark ; occiput with some yellow pile ; anterior part 

 of dorsum, of thorax yellow ; black between the bases of the wings ; scu- 

 te Hum. variable, usually having black and yellow pile mixed, but some- 

 tim.es entirely black and sometimes entirely yellow ; pleura mostly dark ; 

 dorsum of abdomen with the second and third segtnetits yellow, the re- 

 mainder m,ostly black ; venter black; legs black; wings very dark. 

 Males with face and occiput having considerable yellow pile ; dorsum 

 of thorax yellow, except for sometimes an indefinite black interalar 

 band ; pleura mostly yellow ; dorsum of abdomen with the three basal 

 segme7its yellow and the remaining segments black. 



Queen. Head. — Face black ; occiput with some yellow pile, but 

 usually with a more or less strong admixture of black hairs with the 

 yellow, very rarely entirely black ; cheeks black. Front margin of 



TRANS. AM. ENT. SOC, XXX VIII. 



