FUNGUS GNATS OF NORTH AMERICA. 6l 



luin 4 in ' number. Abdomen brown, apical segments, and 

 hypopygium (Fig. 25) blackish. Legs and fore coxae yellow, 

 the middle and hind coxa;, tips of middle and hind femora and 

 of Libia?, dark brown; tibial spurs and tarsi brown. Wing 

 (Fig. 153) hyaline, with a brownish tinge; halteres yellow. 



Female. Similar to the male in coloring. Fore metatarsus 

 and tibia subequal; fore tarsal joints, 2-4 swollen beneath, tip 

 of the ist enlarged. R. I. and Ithaca, N. Y. ^larch and Aug. 



Var. a. Female. Similar to the foregoing but only the 4th 

 and tip of the third joint of fore tarsus distinctly swollen. 

 Ithaca, N. Y. 



3. Phroiiia vemista n. sp. 



]\Iale and female. Length 2.5 mm. Head and antennae 

 brown; palpi and scape dusky yellow; intermediate antenna! 

 joints about twice as long as wide. Thorax brown, including 

 hairs and setae; scutellum with 6 or more marginal setae. 

 Abdomen brown, hairs pale; hypopygium (Fig. 26) yellow 

 with blackish claspers. Coxae and legs yellow, tips of middle 

 and hind femora and tibiae slightly brownish, tibial spurs and 

 tarsi brown; fore metatarsus about 1-16 shorter than the tibia. 

 Wings (Fig. 154) yellowish hyaline; halteres yellow. Male, 

 Vollmer, Ida! (J.M.A.) Sept.; female, Brookings, S. D. 



\'ar. a. Female. Similar to foregoing but thorax more yel- 

 lowish with 3 subconflu'ent brbwn stripes. Antennae more 

 elongate, third joint nearly 3 times as long as wide. Moscow 

 Ida. (J.M.A. ). 



4. Phroiiia difficilis n. sp. 



Male. Length 2.5 mm. Head brownish ; face, palpi and 3 to 

 4 basal joints of antennae yellow, remainder of antennae brown; 

 intermediate segments about 1.5 times as long as wide. Thorax 

 yellow, the center of the mesonotum, scutellum and metanotum 

 from pale to dark brown ; hairs yellow, setae brown ; 4 marginal 

 setae on scutellum. Abdomen yellow, the dorsum of each 

 sclerite with a brown triangle the base upon the posterior mar- 

 gin, the fifth and sixth segments wholly blackish, hypopygium 

 (Fig. 27) yellow, its hairs darker especially at the apex. Coxae 

 and legs yellow, the tips of the hind femora and of hind tibiae. 

 and all the tibial spurs and tarsi, brown; fore metatarsus and 

 tibia subequal in length. \\'ings (Fig. 155) yellowish hyaline; 

 halteres yellow. Ithaca, N. Y. 2 specimens. 



