224 Journal New York Entomological Society. [Vol. xxiii. 



Shining black, frontalia yellowish rufous, extreme base of antenna rufous, 

 face and front distinctly silvery. Mesoscutum thinly silvery before suture, 

 vittse faint. Wings clear, tegulse white. Legs wholly soft black. Third an- 

 tennal joint black with a faint grayish bloom, arista soft black. Ptilinal 

 suture rufous. 



Holotype, No. 19564 U. S. N. M. 



Family CROCUTID^. 



PHASIOSTOMA new genus 



Genotype, Phasiostoma aristalis Townsend new species. 



Differs from Epigrimyia as follows : Male. — Vertex about three 

 sevenths of head width, front slightly widening from same ; face above 

 middle slightly constricted from anterior frontal width, widening 

 slightly below. Outer verticals short, ocellars weaker ; two reclinate 

 f ronto-orbitals ; two moderately strong proclinate fronto-orbitals, 

 often a third weaker one in front of these with microch^etse forming 

 a continuation anteriorly in line with same as far as end of frontals, 

 latter reaching end of second antennal joint. Frontalia averaging 

 about as wide as one parafrontal, sometimes wider. Facialia quite 

 strongly diverging downwardly, their surface pressed flat and even 

 with that of the very narrowed parafacials, furnished with short 

 microchsetse nearly or more than half way up. Epistoma much pro- 

 jected anteriorly between the vibrissje, the oral margin arcuate, the 

 profile of epistoma projected from that of clypeus in a rather even 

 curve, the mouth very suggestive of the Phasiid type but epistoma 

 more prominent. Proboscis rather stout, the part below geniculation 

 little more than two thirds head height. Palpi shorter. Eyes not 

 reaching vibrissse, the cheeks about two fifths of eye height. An- 

 tennae reaching oral margin; third joint straight on upper edge, 

 slightly widened distally, evenly curved on under edge and tip in pro- 

 file; arista as long as third antennal joint, geniculate, thickened to 

 tip, first joint rather longer than broad, second nearly or quite as 

 long as third. Antennse inserted even with upper border of eyes, 

 antennal axis of head hardly as great as vibrissal and conspicuously 

 less than oral axis. Four sternopleurals ; median marginal pair of 

 first segment small, third and fourth segments with marginal row. 

 Hypopygium heavier, more elongate, with broader forceps. Middle 

 and hind tarsi normally longer than corresponding tibiae; tarsi very 



