43 



opposite sexes; in the femtile the abdoiiien is bhick, while in the male i1/\.4^l^[_^ 

 it is largely or wholly yellow ; in the female the thorax is gray pollinose, V ^jt? Ur*/ 

 marked with two black vitta'; in the male it is yellowish pollinose, yYiJ. 

 marked with four black vittfe; length, 5 to 7 mm. Grimsby, Canada; iC-.'^l^Xv- 

 Maine; Franconia and White Monntains, New Hampshire; District of . ^,^ . 



Columbia; North Carolina: Tifton, (xa. ; Texas, Colorado, and California, '^^'-'"^j^^^ 

 (Dipteres Exotiqnes, Vol. 11, Part III, p. 233(70); 1842. (Ij/mnosoma >^-t*^. 



ocv'ulua Walker, List Dipt. Insects, Part IV, p. G02; 1849. ChtogaHter 

 (livisa Loew, Diptera Amer. Sept. Indig-., Centnria IV, No. 88; 1803. 

 Gymnodytki divisa Braner and Bergenstamm in lift.) . . imnuicidata Macq. vx 



/ Genus GYMNOSOMA Meig. ' 



Gymnosoma Meigeu, iu Illiger's Maga/.in fiir lusektenknndo, "\'ol. 11, p. 278; 1803. 



In our single sj^ecies the abdomen is yellow and nnirked with a black ^^..^Jt i^T. 

 dorsal vitta or row of spots; dorsum of thorax of male in front of the 

 suture yellowish pollinose and marked with four black vitta*, but in *''t^2ZL* 

 the female the dorsum is destitute of pollen except the humeri and nar- C<-^.C4rc(- ■^h^^ 

 row lateral margins; length, 5 to 8 mm. (Jrimsby, Canada; White J^^. ^^- . 

 Mountains and Franconia, N. H. ; Maryland; District of Columbia; ^^ 



Virginia; Michigan; Agricultural College, Miss.; New Orleans, La.; \,^,,g.^.,e.^,^ 

 Missouri; Kansas; GreeuRiver City, Wyo.; Colorado, Idaho, and Call- J^^ 



fornia. (Essai sur les Myodaires, p. 237; 1830. Gymnosoma par 

 Walker, List of Dipterous Insects, Part IV, p. 092; 1849. Gymnosoma 

 filiola Loew, Dipt. Amer. Sept, Indigena, Centnria X, No. 00; 1872. 

 Gymnosoma sp., Brauer and Bergenstamm in Hit.) fidiijinoxa Desv. 



Genus PHORANTHA Rond. - P h ^ & '. * h ^^r-- '? OJ-" 



Phoraniha Roudani, Diptcrologia' Italicii' rrodromns, \<A. V, p. 21; 1862. 



Our species are black, the palpi and apex of proboscis sometimes 

 yellow; only one postsutural and one sternopleural macrocha'ta; wings 

 not marked with brown beyond the base of the discal cell, costa nearly 

 straight: 



1. Thorax subshining, almost destitute of pollen, not marked with dis- 



tinct black vittai; last section of the thinl vein nearly one half 



as long as the preceding section 2. 



Thorax opaque, densely gray pollinose, marked with four shining 

 black vitta^; frontal vitta of female at the mirrowest point 

 slightly wider than the distance between the posterior ocelli, 

 last section of the third vein one-fourth as long as the i)re- 

 ceding section, calypteres white; length 7 mm. Los Angeles 

 County, Cal. (Tijdsch. voor Entomologie, Vol. XXXV, p. 185; 

 ^1892 : Hyalomyia.) niffrens v. d. W. 



2. Calypteres whitish, second and third segments of abdomen thinly 



whitish i)ollinose, frontal vitta^f/female at the narrowest i)oint 

 less than one-third as wide as the distance between the posterior 

 ocelli; length, 2..") too mm. I-'ortlMcLeod, British America: Mary- 

 land; southern Illinois; Georgia; Nueces, Tex.; South Dakota; 



ii^^^M^ fa^^-^-^ K^^-^ca^ rr^JTtt^^ 



