322 Annals Entomological Society of America [Vol. XI, 



h. Hypopygium with 2 clusters of setae, 1 on each side of the mid- 

 ventral line, no long slender seta on the inner margin of the 

 clasper (Fig. 9). Costa produced not over two- thirds the way 

 from the tip of Rg to the tip of Mi (Fig. 40). . .9. fochi n. sp. 

 hh. Hj'popygium with no cluster of set£e on each side of the mid- 

 ventral line, at least one long slender seta on the inner margin 

 of the clasper (Fig. 10). Costa produced over two-thirds the 

 distance from the tip of Rg to the tip of Mi (Fig. 41). . . . 



10. joffrei n. sp. 



gg. Clasper with no stout apical spines munda Joh. 



ee. Rs ends opposite or distad of the tip of M2. 



f. Ri ends distad of the forking of M; halteres dark. 



g. Clasper with a mesal process. Rg ends noticeably distad of the 

 tip of M2. 

 h. Mesal process of claspers robust (Fig. 106 m); wing (Fig. 225), 



di(x Joh. 

 hh. Mesal process of claspers slender (Fig. 107 m) ; wing (Fig. 226), 



imitans Joh. 

 gg. Clasper (-Fig. 11) with no mesal process. Rs ends about opposite 



the tip of M2 (Fig. 42) 11. quadrispinosa n. sp. 



ff. Ri ends about opposite the forking of M. 



g. Apical tooth of clasper placed near the mesal margin of the 

 apex (Fig. 115); Species under 2.5 mm. Halteres dusky yellow, 



varians Joh. 

 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); wing (Fig. 232). 



jucimda Joh. 



hh. Halteres and cox^ yellowish; clasper with distinct apical 



tooth (Fig. 108). 



i. Halteres and coxae yellowish. Clasper with no subapical 



spines. 



j. Petiole of cubitus about .6 as long as the basal section of 



M. (Fig. 227) prolifica Felt. 



jj. Petiole of cubitus over .8 as long as the basal section of M. 

 k. Wing veins heavily shaded (Fig. 228) .... prolifica var. a. 



kk. Wing veins not shaded prolifica var. b. 



ii. Halteres fuscous. Coxae dull brown. Clasper (Fig. 18 a, b) 

 with several subapical stout spines. Wing (Fig. 49). 



18. conglomerata n. sp. 



CO. Ri ends at least one-sixteenth of the wing length proximad of the forking 



of M; the base of Rs is distad of the mid point between the humeral 



cross vein and the tips of Ri. 



d. Fulvous mesonotum, abdomen more dusky; or reddish species. 



e. Dusky red species, female 4 mm. long, halteres white; male not 



described sylvestrii Kieffer 



ee. Fulvous mesonotum, abdomen more dusky, length 2 mm. or less, 

 f. Clasper without strong spines at apex. 



g. Tip of Rs ends far remote from apex of wing at a point on the 

 costa about opposite the mid point of branch Mi (Fig. 229). 

 Clasper with several rather slender spines on the inner margin 



proximad of the mid point (Fig. 110) mellea Joh. 



gg. Tip of Rg ends rather remote from apex of wing, but at a point on 

 the costa distad of the mid point of the branch of Mi. Clasper 

 (Fig. 12) with about 5 stout spines and one longer, more slender 

 spine at the middle of the inner margin. Wing (Fig. 43). 



12. luteola n. sp. 

 ff. Clasper with one or more apical spines. 



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

 gg. Ml at least .9 as long as the petiole of the media. 



