PUNGUS GNATS OF NORTH AMERICA. 305 



under the middle of the crossvein ; Cu^ somewhat sinuate; the 

 anal vein and the petiole of the cubitus subequal in length. 

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



7. Triclionta focda Loew. 

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



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

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

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

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

 setcC 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 Init very slightly proximad of 

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



8. TricJwnta diffissa n. sp. 



j\Iale. Length 2.2 mm. Head brownish yellow; face, palpi 

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

 thorax. Dorsum of thorax yellow wdth 3 brown stripes which 

 coalesce posteriorly; scutellum, metanotum, and hinder part of 

 pleura, brown ; hairs yellow, setae brownish. Abdomen 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. Coxse and legs yellow, tibise 

 slightly darker, apex of each hind femur, and the wnole 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. Triclionta patens n. sp. 



Male and female. Length 2.2-2.5 "'"''''• 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 dififers 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., Alay and .August. 



