AMERICAN DIPTERA. 237 



As there are but a few specimens in the collection which can be 

 referred to Say's empiformis, it would be premature to assert that all 

 four species are synonymous, although the specimens agree in all the 

 salient characters with each description. 



For this reason there will be no change in the synonymy in the 

 present paper, and the species may still be known as empiformis Say. 



Euipiforinis Say.- Body whitish ; head cinereous, antennae whitish, ros- 

 trum pale; thorax dusky above; feet white, anterior thighs dilated, robust, 

 emarginate behind the inferior middle for the tip of the tibise, and armed be- 

 neath with distant, equidistant, rather long setae, tibiae incurved at tip and mu- 

 cronate, armed beneath with approximate, short setae, intermediate and posterior 

 feet white, tips of the tarsi blackish ; abdomen deep black, immaculate. 2.5 mm. 



Inhabits Illinois; New York {vittata Lw.), St. Vincent (sp. in- 

 nominata Willist.), Pennsylvania. 



Heinerodroinia defessa Williston. 

 Trans. Ent. Soc. Lond., 1896, p. 439, PI. XIV, fig. 166. 



Head and thorax shining, deep piceous or black, lower part of face and occipi- 

 tal orbits gray pollinose. Eyes broadly contiguous on face. Antennae light yel- 

 low, the third joint as long as the first two together. Bristles of thorax and scu- 

 tellum wholly inconspicuous. Abdomen opaque black, venter yellow. Legs 

 light yellow. Wings nearly hyaline, anterior cross-vein a little beyond the mid- 

 dle of the basal cells. Proboscis light yellow. 2-3 mm. 



St. Vincent, West Indies. 



Differs from captus Coquillett in the shining head and thorax. 



Heinerodroinia eaptus Coquillett. 

 Proc. Nat. Mus., 1895, p. .391. 



Head black, white pollinose. First antennal joint one-half the length of the 

 second, the third two and one-half times as long as the second, broadly oval, the 

 apical third styliform. Eyes widely separated (male). Thorax opaque gray 

 pollinose. Wings hyaline, second basal cell exceeding the first by about twice 

 the length of the cross-vein at the apex of the second. 



New York (Coquillett). 



Heinerodroinia albipes Walker. 

 List Dipt. Ins., iii, p. 505. 



" Body slender, hoary, with a slight tawny tinge ; eyes dark red, mouth tawny ; 

 feelers pale tawny; black towards tip; legs pale yellow; tips of feet piceous; 

 wings colourless; wing ribs pale yellow ; veins tawny, pale yellow towards base ; 

 poisers yellow. 3-4 mm. 



" Hudson Bay Territory (Barnston)." 



TRANS. AM. ENT. SOC, XXVIII. JULY, 1902. 



