NORTH AMERICAN DIPTEKA. 115 



abdominal segment, two lateral pairs tlie anterior stronger, and a 

 very weak subdiscal pair. Abdomen not wider than thorax, rather 

 oval, vaulted, first segment somewhat shortened ; macrochjetse only 

 marginal. Legs of moderate length, somewhat bristly ; claws and 

 jHilvilli of 9 a very little elongate. Wings longer than abdomen, 

 with small costal spine, third vein bristly at base ; apical cell closed 

 and rather short petiolate, terminating well before tip of wing; 

 fourth vein bent at an obtuse angle, with a rudiment of a wrinkle 

 at bend, apical cross-vein nearly straight; hind cross-vein curved, a 

 little nearer bend of fourth vein. Type, 0. kansensis n. sp. 



Olenocliseta kaii^ieiiMis ii. sp. ?.— Eyes brown, frontal vitta brown, 

 sides of front, face and cheeks silvery white, darker in some lights, anterior pair 

 of ocellar bristles strongest, directed backward at tips; first two antennal joints 

 reddish yellow, third joint and arista blackish, second joint with a bristle on 

 anterior edge; proboscis black, labella brown, paljii pale reddish yellow; occiput 

 blackish, gray-hairy, with fringe of black hairs on orbital margin. Thorax black, 

 grayish pollinose. leaving four more or less well-defined black vittje; scutelluni 

 black, brownish yellow on apical portion. Abdomen black, second to fourth 

 segments brassy-gray pollinose at base; first segment with a lateral macrochieta, 

 second with a lateral one and a median marginal pair, third with about eight 

 marginal, anal with six or more marginal macrochictae. Legs black, tibiae 

 bristly, pulvilli dirty whitish. Wings gray, tegulfe whitish, halteres blackish. 

 Length of body nearly 5 nun. ; of wing 4 mm. 



Described from one specimen ; Riley County, Kansas, September 

 (F. A. Marlatt). 



EURYCEROMYI.4 n. gen. 



Belongs in the group with Roeselia, but differs from that genus in 

 the greatly enlarged third antennal joint. Gray species. Head 

 more or less rectangular in ))rofile ; front prominent, very wide, 

 almost three-fifths the width of head ; frontal bristles descending a 

 little below base of antennse, the vertical bristles rather long, the 

 others not stout ; vertical bristles very much the strongest, directed 

 backward, others inward and forward ; three orbital bristles in the 

 female, the middle one weak, the posterior one directed outward and 

 upward, the other two forward ; frontal bristles interspersed with 

 short hairs. Face receding, epistoma not prominent ; facial depres- 

 sion very wide, fully two-thirds the width of head, rather shallow ; 

 facial ridges forming a nearly circular outline, with a few bristles 

 above the vibrissse, but not reaching over halt' way up the face; sides 

 of face narrow, bare ; cheeks wide, nearly as high as the hight of 

 eyes, l)ristly behind and below; vibrissje inserted on the oral margin. 



TRANS. AM. ENT. SOC. XIX. .MAY. 189'2. 



