APPENDIX. 349 



ruginous at base ; posterior segments with yellow posterior 

 margins. 



Length more than half an inch. 



9 First and second joints of the antennae ferruginous ; 

 iergum with five yellow bands j first and second segments 

 ferruginous with yellow posterior margins, the latter seg- 

 ment with a large yellow spot each side, and more or less 

 of black in the middle. 



Size very little larger than the male. 



The very striking similarity in markings between this 

 species and the Pterochilus 5-fasciatus, led me at first to 

 consider it the male of that species, but having several 

 specimens, on submitting them to a more accurate inspec- 

 tion, I discovered that one of the number is a female near- 

 ly corresponding in size with the others, and agreeing with 

 them in the form of the termination of the hypostoma and 

 in the ventral bands, which specifically distinguish this spe- 

 cies from that just mentioned. 



NOMIA, Latr. 



N. ? heteropoda. Hairy, blackish-fuscous ; wings black= 

 ish at tip ; posterior tibia much dilated, triangular ; termi- 

 nal joint of the antennae compressed, dilated. 



Inhabits North-west Territory, Arkansa, and Maryland. 



% Body blackish-fuscous, with cinereous hair ; antennse 

 hardly as long as the thorax, terminal joint compressed and 

 dilated on the inner side, subsecuriform j mandibles un- 

 armed ; wings slightly tinged with dirty yellowish, with 

 a broad, blackish, terminal border, nervures reddish-brown ; 

 intermediate feet with the thighs very much dilated, 

 compressed, triangular, first joint of the tarsus dilated and 

 compressed before ; posterior feet with the thighs dilated, 



Vol. II. 45 



