S. W. WilUsto)! — North American Conops. 336 



front bv a black, o)»aqiK', transverse stripe, continued as a median 

 stripe to its divarication, near the base of the antenna;. Occiput 

 black, dusted with white, posterioi- orbit with a moderately bioad 

 yellowish white line. Thorax black, with whitish bloom, scutellum 

 wholly or in part red ; humeri red or reddish yellow, w'ith a very con- 

 spicuous spot of golden yellow dust above, contimied on their inner 

 sides, and less conspicuously behind ; the narrow, and on the upper 

 half indistinctly limited oblique stripes of the pleurae, upper border 

 of the disk of the metanotum and large spots on the sides with yel- 

 lowish gray dust. Abdomen black, more or less red near the tip of 

 second segment ; first segment with white, end of second with yellow- 

 ish dust; hind borders of thir<l, fourth, and fifth segments conspicu- 

 ously golden yellow, broadest on the fourth ; fourth, fifth and sixth 

 segments conspicuously dusted with w'hite or yellowish. Legs red or 

 reddish brown, often quite black on basal half of femora, behind ; ba- 

 sal halves of tibia? yellow, anterior paii's in their distal portions with a 

 satiny white luster, like the coxa? ; tarsi black near the tips. Anterior 

 half of wings brown, the markings quite as in tibialis, a small sub- 

 hyaline space more frequent in the first posterior cell. Long, corp., 

 11-13'""'. Long, al., S-10'""'. Seven specimens, Penn. (Say). Mass. 

 Conn. ; N. Carolina (Morrison). 



Loew's description oi (jenualis agrees very well, throughout, except 

 that the cheeks are brownish yelloio. C. castanopterus agrees in 

 some respects even better. I give here careful translations of both 

 descriptions, as they are rather inaccessible. 



Conops genualis Loew. 



Neue Beitr., etc.. i, p. 32. 



$> ? " Face yellow ; facial grooves black, the cheeks brownish 

 y el low, without luster except on the under half of the orbit, where 

 there is a white line. Front on the sides yellow with a narrow me- 

 dian black line, bifarious al)ove the antenna? and passing as a black 

 line upon each side of the face. Vertical callosity yellowish brown, 

 bordered in front by a narrow black transverse band. Occiput 

 blackish brown, posterior orbit with a border of yel- 

 lowish b row n d u s t, below yellow. Antennae dark brown, be- 

 low uearly ferruginous; first joint about half as long as the second; 

 the third at the end attenuated ; second joint of the style moderateU^ 

 large, strongly projecting, the third sjiort. Thorax black, humeri 

 and scutelluMi blackish brown, the former with nearlv golden vellow 



