NO. 2152. NEW MUSCOID FLIES— TOWNSEND. 303 



Genus MYOCEROPS Townsend. 



Myocerops Townsend, Ent. News, vol. 27, 1916, p. 178. 



Genotype. — Musca carinifrons Fallen, 1816, Vet. Acad. Handl. 

 for 1816, p. 243. 



Differs from Plwrostoma as follows: Male and female. Form more 

 narrowed. Proboscis and palpi more slender. Head more elon- 

 gate, the parafacials proportionately broader. Facial depression 

 not so broad, the vibrissae nearer to oral margin. Front of female 

 much wider, the vertex much exceedmg one-third head width. 

 Cheeks mder and longer. Three sternopleurals. Abdominal mac- 

 rochaetae not so strong; median marginal pair of first segment long 

 in male, vestigial in female. Wings narrower, apical cell less widely 

 open. 



Genus SUMICHRASTIA Townsend. 



Sumichrastia Townsend, Ent. News, vol. 27, 1916, p. 178. 



Genotype. — Ilystrichodexia aurea Giglio-Tos, 1893, Boll. Mus. Zool. 

 Anat. comp. Univ. Torino, vol. 8, p. 2; and 1894, Ditt. Mess., pt. 3, 

 p. 59. 



Differs from Eudexia as follows: Female. Abdomen broad-oval, 

 wider than thorax, thickly clothed with long golden-fulvous hair 

 especially conspicuous on last two segments; macrochaetae heavy 

 and spinelike ; first segment with only a lateral bunch ; second with 

 thicldy placed marginal row doubled at sides, and median discal 

 triangle of closely placed ones; third segment with about posterior 

 half covered with three irregular rows ; anal with a discal pair or so, 

 sometimes wantmg, and marginal ones among the pile. Venter 

 c[uite thickly set with black spines, except a broad area at base on 

 each side. Coxae thickly set with fulvous hair and bristles, mixed 

 with black bristles; the fulvous bristles predominating on anterior 

 pair. Scutellum with black spines. Peristomal bristles nearly all 

 rufo-f ulvous, two or three of the anterior frontals same color. Palpi 

 quite as long as clypeus, very narrow, a little widened on apical 

 third, with long fulvous hairs on apical half. Parafacials very broad, 

 about four-fifths as wide as middle diameter of one eye. The pile 

 of base of abdomen is shorter than the rest ; there is some shorter 

 pile on parafrontals, occiput, pleurae, posterior part of mesoscutum 

 and on scutellum. Cheeks nearly as wide as eye height. Arista 

 plumose, third antennal joint nearly twice second. Facial carina 

 moderately prominent, vibrissae well above oral margin, vertex 

 about two-sevenths head width; frontalia very broad, only slightly 

 narrowed posteriorly. 



Named in honor of Francois Sumiclii'ast, the eminent Swiss natu- 

 ralist, who did so much valuable pioneer work m Mexico in and after 



