426 AMERICAN HYMENOPTKRA. 



Bombias separatus Viereck, Can. Ent., XXXVI, April, 1904, p. 97. 



Swenk, Ent. News, XVIII, July, 1907, p. 294, n. 1. 

 Bombus " Cockerell, Univ. Color. Studies, IV, 1907, p. 258. 



Types. — From Illinois, Pennsylvania and Canada ; in the 

 collection of the American Entomological Society. 



Pile short and rather coarse in texture. Dorsum of thorax and 

 pleura clothed with yellow pile. Dorsum of abdomen with the first seg- 

 ment yellow ; the second segment more or less brown-ferruginous on the 

 basal portion, especially in the middle, the remainder being black ; the 

 remaining segments all black. Malar space short. Face, venter and 

 legs of females black. Wings of queeti dark. 



Queen. Head. — Face black, but with a very faint sprinkling of light 

 yellow hairs usually present above the bases of the antennae ; occiput 

 usually entirely black, but often with touches of yellow pile ; ckeeks 

 black. Labrum with tubercle-like areas having their margins some- 

 what sharply elevated and their summits coarsely and somewhat 

 sparsely punctate and slightly concaved ; the surface between these 

 areas, and above the shelf-like projection, deeply excavated ; the shelf- 

 like projection wide and prominent. Malar space shorter than its 

 width at the apex, about one-sixth as long as the eye. Clypeus with 

 disc sparsely and delicately punctate, almost smooth ; the corners 

 coarsely punctate. Ocelli as in B. mormonorum. Flagellum of an- 

 tenna about one and four-fifths times as long as the scape ; the third 

 antennal segment much longer than the fifth, the fifth somewhat 

 longer than the fourth. 



Thorax. — Center of the disc naked, the dorsum otherwise being en- 

 tirely covered with yellow pile ; mesopleura always covered with yel- 

 low pile to, or very nearly to, the bases of the legs ; at least the upper 

 portions of the metapleura clothed with yellow pile ; sides of the me- 

 dian segment sometimes with mostly black pile and sometimes with 

 mostly yellow pile, but usually with a mixture of black and yellow 

 hairs. 



Abdomen.— Xyox?>ViVsi: segment one clothed with yellow pile; seg- 

 ment two with at least the basal middle, and often with the basal half, 

 covered with brown-ferruginous or brownish-yellow pile, the rest of 

 the segment being black ; the remaining segments entirely black. Ven- 

 ter black. 



Wings —Deeply stained with brown ; the fore pair lightest across 

 the middle and darkest in the region beyond the veins, often with very 

 slight violaceous reflections. 



Legs. — Black and with black corbicular fringes. 



Worker. — Much like the queen, but with wings usually lighter ; the 

 second dorsal abdominal segment sometimes almost entirely covered 

 with brown-ferruginous pile ; the posterior femora sometimes with a 

 noticeable amount of yellow pile. 



