FUNGUS GNATS OF NORTH AMERICA. 305 



under the middle of the crossvein ; Cu2 somewhat sinuate; the 

 anal vein' and the petiole of the cubitus subequal in kngth. 

 Halteres yellow. Mt. Ascutney, Vt., July ( C.W.J. ). 



7. TricJionta foeda Loew. 

 Berlin. Ent. Zeitschr. XIII. 150. 1869. 



Female. Length 3.7 mm. Head and antennae fuscous black, 

 face and 3 basal joints of antennae, yellow ; palpi mainly yellow. 

 Horsum of thorax yellow, with 3 blackish stripes; metanotum, 

 scutellum and pleura more or less fuscous ; hairs of thorax pale, 

 setse black. Abdomen fuscous, each segment more or less yel- 

 low at the base. ' Coxse and legs .yellow, tarsi darker. Wings 

 cinereous, yellowish toward the costa, the stronger veins fus- 

 cous ; cubitus forks under or but very slightly proximad of 

 the fork of the media. Halteres yellow. "Middle States." 



8. Trichonta diffissa n. sp. 



Male. Length 2.2 mm. Head brownish yellow; face, palpi 

 and base of antennee yellow; antennae 1.5 as long as head and 

 thorax. Dorsum of thorax yellow with 3 brown stripes which 

 coalesce posteriorly; scutellum, metanotum, and hinder part of 

 pleura, brown ; hairs yellow, setae brownish. Abdornen brown ; 

 the venter and both front and hind margins of the segments 

 and the hypopygium (Fig. 113) yellow; larger part of fifth 

 and sixth segments dark brown. Coxae and legs yellow, tibiae 

 slightly darker, apex of each hind femur, and the whole of the 

 tarsi brown. Wings hyaline with a yellowish tinge ; venation 

 as figured. Halteres yellow. Ithaca, N. Y., and Brookline, 

 Mass., August ( C.W.J. ). 



9. Trichonta patens n. sp. 



Male and female. Length 2.2-2.5 J^^- I^^ color similar to 

 the foregoing. In the type specimen, the thorax is largely yel- 

 low, thoracic stripes pale brown, and the apex of the hind 

 femur is not brown. In other specimens the darker color pre- 

 dominates. »Differs from T. diffissa in wing venation, the cubi- 

 tus forking distad of the proximal end of the crossvein (Fig. 

 223). The hypopygium difTers in having a clavate lobe about 

 1-2 as long as the clasper articulated near the base of each 

 clasper; and in having the apex of the ventral sclerite densely 

 setose (Fig. 114). Ithaca, N. Y., May and August. 



