FUNGUS GNATS OF NORTH AMERICA. 289 



Specimens of both sexes taken June-September at Ithaca, 

 N. Y., do. not differ from the type in the museum at Cambridge. 

 Hypopygium and wing as figured. (Figs. 99, 204). 



20. Leia opima Loew. 



BerUn. Ent. Zeitschr. XIII. 145. 1869. (Glaphyroptera). 



Male and female. Length 3.8 mm.; wing 4.1 mm. Head 

 yellow, vertex and upper half of occiput fuscous; antennae fus- 

 cous, scape, first flagellar joint and palpi yellow. Thorax in- 

 cluding scutellum yellow ; dorsum shining, .on each side with 

 large, black, oval spot which is produced forward to the anterior 

 third of thorax leaving only a narrow yellow vitta in the center; 

 the metathoracic tubercles and the metanotum black. Pile yel- 

 low, on the darker parts, dusky. Abdomen largely black, the 

 base of the second tergite and the anterior angles of the follow- 

 ing ones, the hypopygium (Fig. 100) and the venter, yellow. 

 Coxge and legs pale yellow, extreme apices of hind femora black, 

 tarsi except their bases, fuscous black. Wings dilutely cin- 

 ereous, veins fuscous; the preapical fascia paler toward the 

 posterior margin ; a fuscous spot covers the base of the cross- 

 vein and the petiole of the media; another spot is behind Cua 

 (Fig. 205). Halteres yellow. "Connecticut;" Wis. and Wyo. 

 (W.M.W.); R. I. (J.B.); N. C. fW.B.) ; Mass. (C.W.J.) ; 

 Maine; N. H. ; N. J., (Weidt). 



21. Leia suhlunata Loew. 



Berlin. Ent. Zeitschr. XIII. 145. 1869. (Glaphyroptera). 



Female. Length 4.3 mm ; wing 4.5 mm. Head yellow, ocelli 

 margined with black, middle one minute ; antennae subfuscous 

 toward the tip ; palpi pale yellow. Thorax yellow ; mesonotum 

 on each side near the base of the wing and in front of it, with 

 a small black spot, metathoracic lobes sometimes margined with 

 subfuscous. Abdomen yellow, first and sixth tergite with nar- 

 row black margin ; the 4 intermediate with wide fasciae which 

 are suddenly narrowed at the lateral margins ; seventh wholly 

 yellow ; venter yellow. Coxae and femora pale yellow ; extreme 

 tip of hind femur black; tibiae and spurs yellow; tarsi except 

 their bases, fuscous black. Wings yellowish, veins fuscous, 

 toward the base in part yellowish ; near the tip with a slender 

 arcuate fascia ; Cu2 with a fuscous cloud behind it. "N. Y." 



