I'UNGUS GNATS OF NORTH AMERICA. I23 



k. Clasper with 2 or 3 apical or subapical 

 spines; halteres black or brown. 

 1. Black species 3 mm. in length, with 

 blackish legs, clasper subglobose (Fig. 

 128). 41. scita n. sp. 



11. Smaller species with yellow legs, clasper 

 more slender. 

 m. Spines of clasper short (Fig. 129) ; 

 pleura reddish. 42. fumida n. sp. 

 mm. Spines of clasper long (Fig. 130) ; 

 pleura fuscous. 43. trivialis n. sp. 

 kk. Clasper with 5 or more apical and sub- 

 apical setae or spines. 



I. Apex of clasper with 6 or 8 setae of 



which one is somewhat set apart from 

 the others (Fig. 137) ; halteres yellow ; 

 hind coxje dark; wing (Fig. 252). 



45. impatiens n. sp. 



II. Setae of apex of clasper subequal in 



size, 

 m. Antennas of male less than 3-4 length 

 of body in dried specimens ; coxae 

 yellowish. 46. coprophila. 



mm. Antennas of male over 3-4 of length 

 of body in dried specimens ; coxae 

 brownish, hind pair darker. 



47. caldaria. 

 Females may usually be traced by means of the key but to do so it 

 will be necessary to follow out several branches of the dichotomic 

 divisions. The females of the species pauciseta, multiseta, agraria, 

 coprophila, caldaria, and varians all bear a close resemblance to each 

 other; and are therefore separated with difficulty. 



Say's, Walker's and Fitch's species are not included in the table. 

 The descriptions of all are reproduced on page 138 and following. 



I. Sciara piceo Riibsaamen. 



Berlin. Ent. Zeitschr. XXXIX, 32. 1894. 



Female. Length 11 mm., wing 9 mm., antennae 4 mm. Head 

 and thorax black, the latter slightly pruinose. Abdomen ftiscous 

 with broad orange colored lateral spots, posterior margins of 

 the tergites narrowly yellow ; all the parts fuscous. Costal cell 

 of the wing broad, wing brown, costal, subcostal and cell Ri 

 darkest; subcosta ends free opposite base of Rs ; Ri ends some- 

 what distad of the base of the fork of M ; costa produced half 

 way from Rs to Mi ; petiole of the cubitus very short. "Ga." 



Twelve specimens, from N. C, Ga., and Fla., are as described 



