FUNGUS GNATS OF NORTH AMERICA. 169 



dd. Subcostal crossvein near base of cell R^. 



21. nugatoria n. sp. 

 CO. Cubitus forks under or proximad of R-M crossvein. 

 d. Mesonotum with 5 elongate spots or stripes, the 

 median and the oblique first laterals meeting in 

 front of the scutellum; petiole of media is equal 

 or greater than Mo. 7. ohliqua. 



dd. Mesonotum with 3 more or less distinct stripes ; 

 the subcostal crossvein at or distad of the middle 

 of cell Ri. 

 e. Petiole of the media about 1.5 times as long as 

 cell Rj ; middle thoracic stripe subobsolete. 



22. onusta. 

 ee. Petiole of the media about twice as long as the 

 cell R^ ; middle thoracic stripe distinct. 



12. imitans n. sp. 

 bb. Posterior margin of each tergite yellow, or abdomen is 

 uniformly colored. 

 c. Three elongate spots on each tergite. 13. biseriata. 



cc. Tergites marked otherwise. 



d. Fore metatarsus equal or shorter than its tibia, 

 e. Length 3.5 mm. 17. hirticollis. 



ee. Length 5 to 6 mm. ; petiole of media is shorter 

 than Mj. 20. inendax n. sp. and varieties, 



f. Cubitus forks distad of the R-M crossvein 

 and the subcostal crossvein is placed proxi- 

 mad of the middle of cell R^. 



20. var. a. of mendax n. sp. 

 ff. Cubitus forks under or proximad of R-M 

 crossvein, and subcostal crossvein is placed 

 at or distad of the middle of cell R^. 

 g. Fore metatarsus is 0.9 as long as its tibia ; 

 the cubitus forks under the R-M cross- 

 vein ; the subcostal crossvein is near the 

 middle of cell R^. 20. mendax n. sp. 

 gg. Fore metatarsus is 0.8 as long as its tibia ; 

 the cubitus forks proximad of the R-M 

 crossvein ; the subcostal crossvein is dis- 

 tad of the middle of cell R^. 



20. var. b. of mendax n. sp. 



