FUNGUS GNATS OF NORTH AMERICA. 265 



of the base of the radial sector, cubitus forked under or proxi- 

 mad of it; anal vein does not reach wing margin (Fig. 177). 



Table of species. 

 a. Mesonotum black (N. H.). i. hyalinus 



aa. Mesonotum yellow with black markings. 



b. Mesonotum yellow, marked with a median Y and 2 lateral spots; 

 scutellum black. 2. ypsilon n. sp. 



bb. Mesonotum with 3 dark stripes, confluent posteriorly. 3. Walkeri. 

 L. parruhis belongs to Allocotoccra. 



I. Leptomorphus hyalinus Coquillett. 

 Proc. U: S. Nat. Mus. XXIII. 598. 1901. 

 Female. Length 9 mm. Yellow; an ocellar dot and the 

 mesonotum, except the lateral margin, interrupted above the 

 insertion of wings, black; antennae, except the 2 basal joints, 

 brown; abdomen with indications of an irregular brown fascia 

 at apex of each segment; body polished; wings hyaline, densely 

 short haired. "White Mts., N. H." 



2. Leptomorphus ypsilon. n. sp. 

 Female. Length 8 mm. Head and mouth parts yellow, ocelli 

 close together, surrounded by a blackened area ; antennse about 

 1.7 as long as the thorax, darker on apical 2-3, the first joint 

 with a protuberance below which is covered with a tuft of fine 

 black setae. Thorax yellow, shining; mesonotum with a pair of 

 broad black bands which arise behind the humeri, meet at about 

 the middle of the dorsum and thence continued in a single line 

 to the scutellum ; on each side of this is a large rounded spot 

 which does not reach the posterior margin ; scutellum black. 

 Abdomen yellow, posterior 1-3 of each tergite black. Legs 

 including coxse yellow, extreme tips of hind femora dark brown, 

 tarsi brownish; fore metatarsus 1.6 times the tibia in length. 

 Wings hyaline, apex from before the tip of Ri, with pale brown 

 cloud; venation as figured (Fig. 177). Halteres yellow. 

 Ithaca, N. Y. (2 specimens). 



3. Leptomorphus Walkeri Curtis. 

 British Entomology, 365. 183 1. 

 Male. Length 10 mm. Ferrugineous. Head, with proboscis, 

 palpi and basal antennal joints yellow, ocellar spot dark. 



