FUXr.US GNATS OF NORTH AMERICA. »/ 



ii Fore tarsi robust, but not swollen below 

 ' j. Preapical wing cloud arises at the co'-,tal mar- 

 oiii proximad of the tip of Ri. 

 k. Preapical wing cloud reaches apex of Rs. . 



1 Length 5 mm; hypopygmm (Fig. 83). / 



27. pcrlouga n. sp. 



11. Length 3 mm. 26. nnitator n. sp. 



kk Preapical wing cloud does not reach apex 



of Rs; length 2.5 mm. 28. pohta. 



ji. Preapical wing cloud does not cover tip ot 



vein Ri. . , ^ 



k Hind margin of abdominal segments ^ 



broadly and distinctly yellow. 29. faUa.i. 



kk. Hind margins of segments not broadly and 



distinctly yellow. 



1 The superior forceps with about 6 blunt 



black spines and one longer curved 



one on each limb (Fig. 84)- 



30. pectita n. sp. 

 11. The limbs of the forceps with fewer 

 spines, 

 m. Preapical wing cloud produced to 

 unite with a gray cloud on poste- 

 rior margin; superior forceps with 

 3 or 4 blunt spines and a longer 

 curved one (Fig. 85). 



31. lassata n. sp. 

 mm. Preapical wing cloud abbreviated; su- 

 perior forceps with one short blunt 

 spine on each limb. 32. Icnta n. sp. 

 hh ^Middle tibiae each with i or 2 setae on flexor 

 surface, rarely with an additional smaller one 



above, 

 i Fork of the cubitus noticeably retracted proxi- 

 mad of the base of the crossvein; thorax red- 

 dish, slightly darker dorsally, margins o. 

 abdominal segments broadly yellow; length 4 

 n,in. 33. propmqua? 



ii. Fork of cubitus not retracted when thorax is 

 reddish. . , 



j. Species 4.5 mm long; preapical fascia extends 

 to Cui, apical wing cloud present; cox^e 

 and femora each with brownish spot ; inner 

 lateral side of hind tibire each cihate to 

 near the middle; hypopygium (Fig. 87). 



35. fatita n. sp. 



jj. Smaller species. 



