FUNGUS GNATS OF NORTH AMERICA. 313 



and the wide margin of the scutellum yellow. Abdomen yellow, 

 the dorsum of each sclerite except narrow hind margin, the 

 entire last segment, and the tip of the large hypopygium (Fig. 

 124) black. Two scutellar and 2 posterior basal hind coxal 

 setge. Legs colored as in inflata. Wing yellowish gray hyaline, 

 subcosta ends in Ri (Fig. 235). Halteres yellow. Wis. 

 (W.M.W.) and Cornish, N. H. (C.W.J.) July. 



8. Rhyiiwsia captiosa n. sp. 



Alale. Length 5.5 mm. Head fuscous, face, palpi, scape 

 and base of flagellum yellow ; antennse about a third longer than 

 the thorax. Thorax yellow, the dorsum of mesothorax, the 

 disk of the scutellum, the center of the metathorax, and the 

 lower margin of the pleura, fuscous. The hairs of the head 

 and thorax appressed, pale, the setae black; 4 prominent scutel- 

 lar setae. Abdomen yellow, the dorsum of each of the first four 

 segments brown except toward the posterior margin, the whole 

 of the fifth and sixth brown; hypopygium large, about as long 

 as the last two abdominal segments taken together; yellow, 

 tipped with black. (Fig. 125). Coxae and legs yellowish, tarsi 

 and tibial spurs brown. Wings yellowish gray hyaline, sub- 

 costa ends in Ri (Fig. 236). Brattleboro, Vt., and N. H. 

 ( C.W.J. ). 



Female. Like the male in coloring except that the fifth and 

 sixth abdominal segments are marked like those preceding. 

 Hanover, N. H. ; Brattleboro, Vt. ; and North Adams, Mass. 

 ( C.W.J. ). June and July. 



9. Rhymosia diffissa n. sp. 

 Male. Length 4.5 mm. Head fuscous, face dusky yellow, 

 palpi and scape yellow ; antennae over twice as long as the 

 thorax. Thorax fuscous, the humeri and a narrow line to the 

 base of the wing yellow, hairs appressed, pale, set?e black, 2 

 scutellar setse. First and last segment of the abdomen largely 

 black, the intermediate segments yellow, each with a very large 

 triangular saddle which nearly reaches the posterior margin, 

 broadest anteriorly where it nearly reaches the sternite ; hairs 

 dusky; hypopygium large, yellow, tipped with black (Fig. 126). 

 Coxae and legs yellowish, tarsi and tibial spurs brown. Wings 

 yellowish gray hyaline, subcosta ends in Ri (Fig. 237). Hal- 



