86 AMERICAN HYMENOPTERA. 



entirely with pure yellow pile. Occiput bearing a large triangular 

 patch of pure yellow pile. Ventro-lateral portions of head bearing 

 mostly yellow hair. Beard of mandibles heavy and ferruginous. 

 Malar space slightly longer than its width at apex, about one-fifth 

 as long as the eye. Clypeus, for most part, densely covered with pure 

 yellow pile. Third and fifth antennal segments subequal, the fourth 

 shorter than either. 



Thorax. — Coloration of pile much like that of the worker ; meta- 

 pleura and sides of median segment rather heavily clothed with pure 

 yellow pile. 



Abdomen. — Dorsum: segments one and four yellow; segments two 

 and three ferruginous-red ; segment five mostly black, but with a 

 sprinkling of yellow hairs on the extreme sides ; segments six and seven 

 black. Venter with the apical margins of most of the segments heavily 

 fringed with pale yellow hairs. 



Genitalia. — About like those of huntii. 



JVings .—Only very slightly infuscate ; the fore pair clear trans- 

 parent, except in the region beyond the veins, this region being slightly 

 darker than the remaining portion. 



Legs.—Coxse, trochanters and femora all clothed very largely with 

 yellow pile, the femora, however, with dark hair on their upper sides 

 and around their distal ends. Fore and middle tibise mostly dark. 

 Hind tibiae with outer faces flat, or slightly convex, and very sparsely 

 hairy, almost entirely bare, their fore and hind fringes moderately long, 

 forming distinct, though weak, corbiculae, and rather strongly pale 

 ferruginous. Hind metatarsi with their outer faces somewhat con- 

 caved, their hind fringes moderately long toward their bases, but short 

 toward their apices. 



Dimensions. — Length : worker, 10 mm. to 12| mm. ; male, about 

 12 mm. Spread of wings: worker, 25 mm. to 27 mm. ; male, 26i 

 mm. 



This species is very closely related to huntii, from which 

 I have been unable to separate it structurally and of w^hich 

 it may really be a subspecies. The yellow pile of this spe- 

 cies varies from a pale straw-yellow to a light gold. The 

 red pile is normally quite a deep red, and has both red and 

 orange or ferruginous values, 



Boinbiis (Bombus) ephippiatus Say. 

 Bombus ephippiatus Say, Boston Journ. Nat. Hist., I, P. 4, 1837, p. 

 414, n. 2. 

 Smith, Cat. Hym. Brit. Mus., II, 1854, p. 399, 

 n. 56. 

 " " Le Conte, Writ, of Th. Say Ent., 1859, p. 788, 



n. 2. 



