236 long's second expedition. 



9 First and second joints of the antennae ferruginous; terguni 

 with five yellow bands ; first and second segments ferruginous., 

 with yellow posterior margins, the latter segment with a large yel- 

 low 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 b-fasciatus, led me at first to consider it the 

 male of that species, but having several specimens, on submitting 

 them to a more accurate inspection, I discovered that one of the 

 number is a female nearly corresponding in size with the others, 

 and agreeing with them in the form of the termination of the hy- 

 postoma and in the ventral bands, which specifically distinguish 

 this species from that just mentioned. 



NOMIA Latr. 



N. ? heteropoda. — Hairy, blackish-fuscous ; wings blackish at 

 tip; posterior tibia much dilated, triangular ; terminal joint of 

 the antennae compressed, dilated. 



Inhabits North-west Territory, Arkansa, and Maryland. 



% Body blackish-fuscous, with cinereous hair ; antennae hardly 

 as long as the thorax, terminal joint compressed and dilated on 

 tht inner side, subsecuriform ; mandibles unarmed ; wings slightly 

 tinged with dirty yellowish, with a broad, blackish, terminal bor- 

 der, 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 

 [350] dilated, particularly towards the tip; tibia remarkably dilated, 

 forming a rectangular triangle, much compressed, excepting at 

 the inner tip, and undulated on the inner side, first joint of the 

 tarsus elongated, much longer than the tibia, not dilated, densely 

 ciliated on the inner side with equal, fulvous hair ; venter sparse- 

 ly hairy ; fourth segment divided by a longitudinal suture in the 

 middle, at the posterior angles prominent, acute ; fifth segment 

 short, longitudinally carinated in the middle, and with a promi- 

 nent tubercle each side behind ; sixth segment longitudinally 

 divided in the middle by a suture. 



Length seven-tenths of an inch. 



This singular insect does not perfectly correspond in character 

 with the genus under which I have placed it, and it disagrees 

 still more with the neighboring genera as defined in the books. 



