FUNGUS GNATS OF NORTH AMERICA. I47 



I. Polylepta fragilis Loew. 

 1869. fragilis, Loew, Bed. Ent. Zeitschr. XIII. 138. 

 Female. Length 4 mm. Fuscous black, slightly white polli- 

 nose, subopaque. Antennae fuscous black, the scape and the 

 extreme base of the flagellum yellowish, the first joint of the 

 former fuscous above ; palpi yellow ; ocelli arranged in a flat- 

 tened triangle. Coxje and legs yellow, the tarsi except their 

 bases, fuscous. Wings subhyaline, cinereous fuscous tinted ; 

 veins fuscous ; costa not produced beyond the tip of R^+g ; cell 

 R^ nearly twice as long as wide, the subcostal crossvein placed 

 at the middle of the anterior margin of this cell ; subcosta is 

 strong from the base of the wing to the crossvein, then abruptly 

 interrupted; petiole of the media a little shorter than M^ but 

 over twice as long as the cell R^ ; cubitus forks distad of the 

 R-M crossvein ; R^^^ noticeably undulating. Halteres pale. 

 Recorded from A/Iassachusetts. 



2. Polylepta leptogaster Winnertz. 

 1863. leptogaster, Winnertz, Verb. Zool.-bot. Ges. XIII. 746. 

 Female. Length 4.5 mm. Body brown. Margin of the 

 mouth produced and bordered with hairs. The fiHform antennoe 

 I 1-3 times as long as head and thorax combined, the flagellar 

 joints 3 to 4 times as long as broad. Abdomen very slender, 

 cylindrical, 5 to 6 times as long as the very short thorax, con- 

 stricted at the base. Coxae and femora yellow, tibia slightly 

 darker, tarsi pale brown. Fore tarsus 2 1-3 times as long as 

 the tibia, the latter about 1-16 shorter than the metatarsus. 

 Wings hyaline, somewhat cinereous tinged, costa (fig. 90) pro- 

 duced beyond R^+r, to the apex of the wing; subcosta ends free 

 proximad of the R-M crossvein ; the subcostal crossvein far 

 retracted, cell R^ trapezoidal, 13^ to 2 times as long as broad; 

 petiole of the media about half as long as M^ ; cubitus forks 

 distad of the small cell ; anal vein slender, incomplete. Hal- 

 teres whitish, with fuscous knob. Recorded from N. H. and 

 Indiana. 



3. Polylepta obediens n. sp. 



]\[ale. Length 5 mm. Head black; proboscis reddish; palpi 



and basal joint of antennae yellow, face and flagellum fuscous, 



the intermediate joints of the latter about ^4 longer than the 



diameter. Mesonotum opaque with 3 dull dark brown conflu- 



