March, 1907.] AlDRICH : NORTH AMERICAN DiPTERA. 5 



THEREVA. 



novella Coquili.ett, Canad. Ent., XXV, 200. — Los Angeles Co., Cal. 



ATOMOSIA. 

 pusilla Macquart, Dipt. Exot., i, 2, 76. — N. A. 



DASYLLIS. 

 albicoUis Bigot, Annales, 1878, 229. — Me.\ico. 



ERAX. 

 dubius WiLLiSTON, Trans. Amer. Ent. Soc, 1885, 64, mentioned in the table ; the 

 " Erax n. sp." described on p. 68 of the article is the same, according to Snow, 

 Kans. Univ. Quart., IV, 184, 1896. 



PSILOPODINUS. 

 carolinensis Bigot, Bull. Soc. Ent. France, 1888, xxix [Psilopus). — Carolina. 

 occidentalis Bigot, Bull. Soc. Ent. France, 1888, xxix [Fsilopus). — Cal. 

 pampaecilus Bigot, Bull. Soc. Ent. France, 1888, xxix {Psilopus). — Hayti. 

 astequinus Bigot, Bull. Soc. Ent. France, 1888, xxx {Fsiloptis). — Mex. 



AGONOSOMA. 



pallescens Bigot, Bull. Soc. Ent. France, 1888, xxix {PstVopus). — North 



Carolina. 

 polychroma Bigot, Annales, 1890, 289 [Psiiopus). — Hayti. 



RHAMPHOMYIA. 

 morrisoni Bigot, Bull. Soc. Ent. France, 1887, cxli ; Annales, 1889, 132 (both 

 morissoni ) . — ■ Nevada. 



NAUSIGASTER. 



unimaculata Townsend, Annals and Mag. Nat. Hist., XX, 24. — Cal. 



MELANOSTOMA. 

 bellum GiGLio-Tos, Bull. R. Univ. Torino, VH, no. 132; Ditt. del Mess., H, pi. 

 II, f. 7, 7a. — Mex. 



SPH^ROPHORIA. 



syrphica Giglio-Tos, Bull. R. Univ. Torino, VII, no. 132; Ditt. del Mess., II, 

 pi. II, f. 5, 5«. — Orizaba, Mex. 



VOLUCELLA. 

 trigona Gigi.IO-Tos, Bull. R. Univ. Torino, VII, no. 123 ; Ditt. del Mess., I, 52. 

 — Orizaba, Mex. 



CRIORHINA. 



nigra Williston, Synops. N. A. Syrph., 214 {Cynorkma). — White Mts. , N. H. 



CONOPS. 

 quadrimaculatus Ashmead, Orange Insects, 69, f. 63. — Fla. 



SARCOPHAGA. 

 ? despecta Thomson, Eugenics Resa, 540. — Puna ; a doubtful variety from Panama. 



