FUNGUS GNATS OF NORTH AMERICA. I37 



(fig. no). Cox3e and legs yellow, trochanters with black tips, 

 tarsi subfuscous, empodium bushy; each claw with a single 

 tooth; setae of fore and middle tibiae very small, sparse, those 

 of the hind tibiae on the lateral and extensor surfaces about 6 

 or 7 in each row, the longest about as long as the diameter of 

 the tibia ; fore metatarsus and tibia subequal, the second tarsal 

 joint about 0.6 as long. Wings yellowish hyaHne, veins brown- 

 ish yellow; the distance from the humeral crossvein to the sub- 

 costal crossvein 4 times as great as from the latter to the tip of 

 the subcosta; the subcostal crossvein is placed near the distal 

 end of cell R^, the latter is about 1.5 times as long as wide; 

 petiole of the media is about 0.5 as long as the R-M crossvein ; 

 the cubitus forks a very little distad of the tip of the subcosta ; 

 anal vein incomplete, but strong. Halteres yellow, with a black 

 knob. Ithaca, New York; Polk Co., Wisconsin. 



Var germana n. var. In one male from Polk Co., Wisconsin, 

 collected in July by Professor Wlieeler, the crossvein is near the 

 middle of the small cell. 



Var. socia n. var. Several male specimens from Burlington, 

 Vermont, collected in June by Mr. C. W. Johnson, have similar 

 hypopygium, structure and markings, but the small cell is about 

 twice as long as wide ; the subcostal crossvein is placed distad 

 of the middle, the tip of the subcosta thus ending but little be- 

 yond the distal end of this cell. A female from Boston also 

 belongs here. 



Some female specimens from Milwaukee, Wisconsin, do not 

 differ from Var. germana except that there are indications of 

 three slender brownish lines on the mesonotum. 



3. Sciophila niigax n. sp. 

 Male. Length 2.75 mm. ; wing 2.5 mm. Head fuscous, an- 

 tennae fuscous apically, basal joints, face, mouth parts and palpi 

 yellow ; hairs of head and antennae yellow, intermediate antennal 

 joints over 1.5 times longer than wide. Thorax yellow, sub- 

 shining, mesonotum with 3 brownish longitudinal stripes, abbre- 

 viated and paler anteriorly, dark, converging and almost meet- 

 ing posteriorly just in front of scutellum; metanotum brownish, 

 thoracic hairs yellow. Abdomen reddish yellow, median trans- 

 verse fascia on the intermediate segments black, posterior seg- 

 ments more blackish ; hypopygium yellow. Dorsal plate of 

 hypopygium (appendix externa) triangular in outline; apical 



