FUNGUS GNATS OF NORTH AMERICA. I2T 



jj. Clasper without any, or with only a single 

 prominent apical or subapical tooth besides 

 the setae; or if 2 or 3 smaller spines are 

 present then tip of Rs is proximad of the 

 tip of M2. 

 k. Rt ends only slightly proximad of the fork- 

 ing of M (Fig. 255) ; knob of halteres 

 and coxse brownish; clasper (Fig. 115)- 

 40. varians, var c. 

 kk. Ri ends far proximad of the forking of At. 



I. Clasper subglobular. 



m. Clasper subglobular, with the tooth 

 subapical in position (Fig. 116) ; 

 wing broad. 27. S. sp. 



mm. Without subapical tooth. 



28. lugens n. sp. 



II. Clasper more slender, wing narrow. 



m. Halteres yellow ; Rs ends far proxi- 

 mad of the tip of M2 (Fig. 241). 



30. fatigans n. sp. 

 (See S. sp. p. 144). 

 mm. Halteres fuscous ; Rs and M2 end 

 about equidistant from base of 

 wing (Fig. 250). 44. acuta n. sp. 

 hh. Petiole of the cubitus at least half as long as 

 the basal section of M. 

 i. Rs ends proximad of .85 of the length of the 

 wing, 

 j. Clasper with 2 strong apical spines (Fig. 118) ; 

 wing veins strongly defined (Fig. 238) ; 

 thorax shining black. 29. parilis n. sp. 



jj. Clasper and wing of different structure. 



k. Costa produced less than 2-3 of distance 

 from Rs to Mi. 



I. Wing narrow (Fig. 240) ; hypopygium 



(Fig. 120). 31. sativae n. sp. 



II. Wing wider (Fig. 267) ; costa less pro- 



duced; hypopygium (Fig. 261). 



32. cticumeris n. sp 

 kk. Costa produced over 2-3 from Rs to Mi. 



I. Clasper with 2 apical teeth (Fig. 121) ; 



"petiole of cubitus about 3-4 as long as 

 basal section of M ; hind tarsus shorter 

 than the tibia. 2>2- S. sp. 



II. Clasper with a median process (Fig. 

 T22) ; petiole of the cubitus about half 



as long as the basal section of M (Fig. 

 242) ; hind tarsus and tibia subequal. 



34. neglecta n. sp. 



