FUNGUS GNATS OF NORTH AMERICA. 261 



Ocelli 3 in number, placed high upon the front, laterals re- 

 mote from the eye margin. Legs strong, hind tibise with 3, 

 ranges of strong setse outwardly, the middle tibiae each with a 

 single long seta on the flexor surface beyond the middle. Wings 

 elongate oval; subcostal vein ends at about 1-3 the length of the 

 wing, the subcostal crossvein (Scs) wanting; the costa ends 

 far beyond the tip of the radial sector, but does not reach the 

 apex of the wing; basal cell R is about half the length of the 

 wing; the anterior branches of both media and cubitus are 

 detached at the base (Fig. 173). 



Table of species. 



a. Petiole of the media noticeably longer than the cell in the fork,, 

 which is wide open at the base ; Mi not distinctly sinuate. 

 (Fig. 173). I. abbreviata. 



aa. Petiole of the media and the cell subequal, the cell narrowly open at 

 the base, Mi sinuate. 2. sororcula^ 



punctata Bellardi and iinicolor Walker probably belong to Leia. 



1. Rondaniella abbreviata Loew, 

 Berliner Ent. Zeitschrift. XIII. 147. (Leja). 1869. 



Male and female. Length 2.5 mm. Pale yellow; apical por- 

 tion of the antennze, confluent thoracic stripes which are abbre- 

 viated anteriorly, metathorax and apex of each hind femur, 

 black ; each abdominal segment with subfuscous posterior mar- 

 gin. Hypopygium as figured (Fig. 142). Apex of wing widely 

 fuscous, the cell Rs noticeably more than twice as long as Mi 

 which is wide open at the base (Fig. 173). "Middle states;" 

 N. C, (W.B.) ; Wis., (W.M.W.) ; Selkirk Mts., B. C, 

 rj.C.B.) ; Ithaca, N. Y. ; and Orono, Maine. 



2. Rondaniella sororcula Loew. 

 Berliner Ent. Zeitschrift. XIII. 147. (Leja). 1869. 



Male. Length 2.5 mm. Pale yellow ; flagella of the antennae^ 

 posterior half of the thorax and apex of each hind femur, black; 

 posterior margin of each of the first 4 abdominal segments, 

 fuscous, fifth and sixth segments wholly black, apex of the 

 wings fuscous ; cell Rs about twice as long as cell Mi which is 

 narrowly open at the base. "New York." 



