1918] Revision of the Genus Sciara 327 



pp. Clasper (Fig. 27) with no long subapical 



spines. The distance between the tip of 



Ri and the point on the costa opposite 



the forking of M is not greater than the 



distance between the tips of Mi and Ma. 



Wing. (Fig. 58).... 27. macroptera n. sp. 



ij. Clasper with two or more prominent apical teeth, spines, or 



with strong setae. 



k. Clasper with two or three apical or .subapical spines. 



Knobs of halteres black or brown. 



I. Black species 3 mm. in length, with blackish legs. 



Clasper subglobose (Fig. 128) scita Joh. 



11. Smaller species with fuscous yellowish legs. Claspers 



more slender. 



m. Spines of clasper unusually short (Fig. 129). The 



distance from the tip of Ri to the point on the costa 



opposite the forking of M is greater than the 



distance between the tips of Mi and M2. _ 



fumida Joh. 



mm. Spines of clasper not unusually short. The distance 



from the tip of Ri to the point on the costa opposite 



the forking of M is less than the distance between 



the tips of Ml and Mo. 



n. Clasper (Fig. 130) with three or four slender 



subequal spines, two or three near the apex, 



the other near the apical third, all on the inner 



margin. Petiole of cubitus about as long as or 



longer than the base of media (Fig. 249). 



trivialis Joh. 



nn. Clasper (Fig. 28) with three rather stout subequal 



spines, all clustered at the apex. Petiole of 



cubitus much shorter than the base of media 



(Fig. 59) 28. subtrivialis n. sp. 



kk. Clasper with five or more apical and subapical setae or 



spines. 



1. Apex of clasper with six or eight spines, one of which is 



set at an angle to the others. (Fig. 137). Halteres 



yellow. Wing (Fig. 252) impatiens Joh. 



II. Apex of clasper with spines or seta; subequal in size and 



distance from each other, 

 m. Clasper with about six stout conspicuous subequal 

 spines (Fig. 29). Wing (Fig. 60). 



29. sexdcntata n. sp. 

 mm. Clasper with no con.spicuous or stout spines. 



n. M2 distinctly shorter than length of petiole of 

 media. Coxae j^ellowish. (Fig. 133). 



coprophila Lint, 

 nn. M2 about equal in length to the petiole of media. 

 Coxae brown or black. Wing (Fig. 62). Clasper 

 (Fig. 31). (Compare caWan'a Lint.) 



caldaria var. 



