156 kansas university science bulletin. 



Systropus. 



(Wiedemann. Nova Dipt. Genera; 1820.) 



Systropus snowi, n. sp. 



Male and female : Antenntr black, basal four-fifths of first 

 joint reddish ; front and face lemon yellow, in certain lights 

 silvery ; proboscis black, palpi yellow, linear ; cheeks and oc- 

 ciput black, grayish pollinose. Thorax black, whitish pile 

 very short ; mesonotum with the lateral margins reddish yel- 

 low ; this color occupies the lateral third of anterior margin of 

 mesonotum, then narrows considerably at a point midway be- 

 tween humeri and wings, widens at base of wings and reaches 

 posterior margin ; a spot above front coxiP lemon yellow ; pleura? 

 reddish centrally; halteres reddish, knobs black on one side, 

 lemon yellow on the other. Abdomen black, second, third, 

 fourth and basal half of fifth segments, except a stripe on 

 dorsum of each, reddish yellow. Legs reddish ; front coxae, ex- 

 cept base and apex, last four joints of front and middle tarsi 

 and hind tibiae and tarsi, blackish ; outer side of front and mid- 

 dle tibiae and metatarsi lemon yellow, in certain lights silvery. 

 Wings with a uniform fuscous tinge ; two submarginal cells 

 present. Length, 19-20 mm. 



Twenty-three specimens ; January. Dedicated to Mr. Frank 

 L. Snow, son of Dr. F. H. Snow, in deference to his interest and 

 energy in collecting insects while in Africa. Not only Diptera 

 but all orders yielded bounteously to his net, and the collections 

 of the Kansas University have been greatly enriched by the ad- 

 dition of this splendid material. 



EMPID^. 



Stilpon. 



(Loew, Neue Beitrag-e. VI, 34 and 43 ; 1859.) 



Stilpon obscuripes, n. sp. 



Female : Black, in large part shining. Front gray, with 

 parallel sides ; vertex with two pairs of forwardly directed 

 bristles ; occiput grayish subshining ; eyes emarginate opposite 

 antennte, and narrowly separated below, face receding ; an- 

 tennae black, pubescent, second joint with a rather long bristle 

 on under side at apex, third joint short, oval, arista subapical 

 and about three times as long as the antennto ; mouth-parts 

 black, proboscis much shorter than height of head, directed 



