FUNGUS GNATS OF NORTH AMERICA. II9 



g. Apical tooth of clasper placed near the mesal 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) ; wirg 

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



hh. Halteres and cox« 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. Wing veins heavily shaded (Fig. 228). ' 



prolifica, var. a. 

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



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

 ing of M: 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. mellea n. sp 

 ff. Clasper with one or more apical spines. 



g. Ml less than .8 as long as the petiole of the media. 



18. tritici 

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

 265). 48. ocellaris. 



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 mesal articulated process. 



f, Hypoji^ygium 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 setze in the basal median ventral 

 patch of the hypopygium (Fig. 117a). 



20. pauciseta. 



