No. 2301. NEW SPECIES OF MU8C0ID FLIES— TOWN SEND. 547 



segments; median discal pair on intermediate segments; median row 

 on last two, but that on anal weak; two strong discal rows rather 

 irregular on anal. 



STEVENIOPSIS SINUATA, new species. 



Length, 8 mm. One male, Manzanares Creek, Pecos National 

 Forest, New Mexico, 7,500 feet, August 30, 1916 (C. H. T. Townsend). 



Brown to blackish, very thinly cinereous pollinose. Palpi, antennae, 

 and frontalia black. Head black, thinly pollinose, more thickly 

 pollinose on sides of face and front. Thorax rather thinly pollinose, 

 leaving four narrow black vittae, the inner pair merged with blackish 

 area between them. Abdomen submarmorate with cinereous pollen, 

 hind margina of segments broadly brownish pollinose. Wings nearly 

 clear, veins dark brown. Tegulae whitish. 



Type.— C&t. No. 22255, U.S.N.M. 



OPELOUSIA, new genus. 



Genotype. — Opelousia obscura, new species. 



Clypeus nearly flush. Epistoma short, not warped. Facialia bare. 

 Proboscis very short; palpi short and rather stout. Third antennai 

 joint about two and one-half times second in male. Arista long- 

 pubescent haKway on upper side only. Eyes bare. Male vertex 

 about one-sixth head v>'idth. Frontals stopping at base of antennae. 

 Ocellars present. Parafacialia bare, equilateral. Cheeks over one- 

 fourth eye length. Two sternopleurals, postintraalars, and posta- 

 crostichals; three postsuturals; one lateral scutellar; no preacro- 

 stichals; short erect decussate apical scutellar pair. Costal spine 

 long, doubled. Third vein v/ith one long bristle and some minute 

 ones at base; others bare. Apical cell narrowly open to nearly closed 

 in tip. Hind crossvein about in middle or nearer to small crossvein. 

 Male claws as long as last tarsal joint. No median marginal on first 

 segment; median marginal pair and incomplete marginal row on 

 second; marginal row on last two segments; discal row on anal. 



OPELOUSIA OBSCURA, new species. 



Length, 4.5 to 5.5 mm. Three males, Opelousas, Louisiana, May, 

 1897; one male, Fargo, North Dakota. 



Brownish, cinereous pollinose. Palpi fulvous. Frontalia and 

 antennae brownish; base of latter obscurely fulvous. Face, cheeks, 

 and sides of front ashy-silvery; occiput cinereous. Thorax subshin- 

 ing, very thinly pollinose, more thickly on humeri; vittae indistinct; 

 a pair more or less visible before suture. Abdomen more thickly 

 cinereous, subsliining, leaving an obscure brown median vitta and 

 brownish hind margins to segments. Femora reddish-brovv-n, tibiae 

 fulvous, tarsi dark. Wings clear. Tegulae glassy- whitish. 



Tyjye. — Cat. No. 22249, U.S.N.M., from Opelousas, Louisiana 



