FUNGUS GNATS OL' NORTH AMERICA. II9 



g. Apical tooth of claspe r placed near the mesa! mar 

 gin of the apex (Fig. 115) ; species under 2.5 mm, 

 halteres dusky yellow. 40. varians, var. c. 



gg. Apical tooth of clasper placed at apex (Fig. 108) or 

 tooth wanting (Fig. 123). 

 ,h. Halteres blackish; hind coxae and legs brownish; 

 claspers without apical tooth (Fig. 123) ; wing 

 (Fig. 232). 23. jucunda n. sp. 



hh. Halteres and coxae yellowish; clasper with dis- 

 tinct apical tooth (Fig. 108). 

 i. Petiole of cubitus about .6 as long as the basal 

 section of M (Fig. 227). 15. prolifica. 



ii. Petiole of cubitus over .8 as long as the basa; 

 section of M. 

 j. \\'ing veins heavily shaded (Fig. 228). 



prolifica, var. a. 

 jj. Wing veins not shaded. prolifica, var b. 



cc. Ri erds at least 1-16 of the wing length proximad of the fork- 

 ing of yi : the base of Rs is distad of the mid point between 

 the humeral crossvein and the tip of Ri. 

 d. Fulvous mesonotum, abdomen more dusky; or reddish 

 species, 

 e. Dusky red species, female 4 mm. long, halteres white, 

 male not described. 16. silvestrii. 



ee. Fulvous mesontum, abdomen more dusky; length 2 mm., 

 or less, 

 f. Clasper without strong spines at apex (Fig. no) ; tip 

 of Rs far remote from apex of wing (Fig. 229). 



17. m el lea n. sp 

 ft. Claspe r with one or more apical spines. 



g.^Ii less than .8 as long as the petiole of the media. 



18. triticl 

 gg. Ml over .9 as long as the petiole of the media (Fig. 

 265). 48. o cellar is. 



dd. Black or fuscous species. 



e. Clasper with a mesal articulated process (Fig. 112) ; 

 Rs ends far remote from apex of wing (Fig. 230). 



19. hastata n. sp. 

 ee. Clasper without mesa! articulated process. 



f. Hypopygium near its base with a patch or tuft of 

 setae on the median ventral line (Figs. 117a, 123a 

 124) ; petiole of the cubitus under .6 as long as the 

 basal section of M. 

 g. Clasper with a terminal tooth. 



h. With about 10 setae in the basal median ventral 

 patch of the hypopygium (Fig. 117a). 



20. pauciseta. 



