118 PACKARD, HUMBLE BEES, ETC. 



and apical segments black. Beneath yellowish, hairy. 

 Length, 7 1-2 lines. 



Female and worker unknown to me. 



One specimen, Connecticut. (Coll. Norton.)" 



BOMBUS AFFINIS Cresson. 



" Female. Head black. Thorax in front and on the sides 

 yellow; between the wings black; scutellum, yellow. 

 Wings fusco-hyaline. Legs black. Abdomen with the 

 whole of the first and the sides and posterior margin of the 

 second segments above yellow; remainder of the second 

 segment rufo-fulvous ; remaining segments black ; be- 

 neath black. Length, 8 lines. 



Male. Colored the same as the female, except a slight 

 admixture of yellowish hairs on the vertex. Length, 8 

 lines. 



Canada, (Saunders) ; and New York, (Coll. Norton.)" 



APATHUS. 



The genus Apatlius may be distinguished from Bombus 

 by the males having broader fronts, and the tibias being 

 convex instead of concave on the outer side, the whole 

 joint being rounder and thicker, while the first tarsal joint 

 is longer and not so convex on the posterior edge as in 

 Bombus, being very straight and oblong. 



The females are more easily known by having very acute, 

 triangular, bidentate mandibles instead of having them spat- 

 ulate and three toothed as in Bombus. The head is also 

 shorter and broader ; the front is much broader, since the 

 eyes are a little smaller, as are the ocelli ; both the 

 clypeus and labrum are shorter and broader, and the 

 antennas are a little stouter. The tip of the abdomen is 

 larger, acute, the surface convex and not concave as in 

 Bombus, and the sides are flat, giving the tip a quadran- 

 gular form. 



APATHUS ASHTONI Cresson. 



This is the largest New England species yet discovered 

 and differs very considerably in its coloration from the 

 others. 



Female. The head is short and broad, the front broad 



