128 PROC. ENT. SOC. WASH., VOL. 21, NO. 6, JUNE, 1919 



ventral side, is a long, black bristle. Front coxa quite long and yellow; 

 middle and hind coxae more normal and brownish, darker at the base. Legs 

 yellow except front femora, apical half front tibiae, front tarsi, apical half 

 hind femora, apical fourth of hind tibiae, and last two joints of hind tarsi, 

 blackish brown. 



Ambopogon hyperboreus GREENE. Fig. i, male; Fig. 2, forceps from 

 above. 



Front femora with numerous long, black bristles on the outside, more 

 closely set towards the base ; front metatarsus straight, cylindrical and slightly 

 longer than the four following joints; middle coxae each have a long, black, 

 hook-like spine on the inside and a long black bristle in front of it; middle 

 femora shorter than the first and much swollen on front side near the middle 

 with numerous, short, spine-like bristles on this swollen part; middle tibiae 

 with a row of heavy black spines on the upper side, spines longer near the 

 middle; middle metatarsus noticeably bent, with numerous short black 

 spines on under side, larger at base and on the upper side with a row, the en- 

 tire length, of black hairs, longer, curved and much closer set towards the 



