1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 409 



Genus MICROPHORUS, Macquart. 

 MICROPHORUS RAVIDUS, new species. 



M(de. — Black, only the halteres whitish. Eyes contiguous, third 

 auteuual joint elongate, conical, the apical style slightly longer thau the 

 third joint; proboscis nearly perpendicular, from two-thirds as long to 

 as long as height of head. Thorax, pleura, scutellum, and abdomen 

 opaque gray pollinose, the bristles black, scutellum bearing four bris- 

 tles; hypopygium rather large, bent around against the right side of 

 the abdomen. Wmgs grayish hyaline, slightly smoky along the veins, 

 stigma and veins brown, no vein issues from the anal cell: this cell is 

 nearly as long as the second basal, the vein at its apex arcuate and not 

 parallel with the hind margin of the wing. 



Female. — Eyes broadly separated; abdomen very blunt at apex; 

 otherwise as in the male. 

 1 Types.— ISo^. 3188 and 3189, U.S.E".M.; length, 2 mm. :Nine males 

 and twelve females collected by the writer in March and April. 



Localitt/. — Southern California. 



Differs from the description of Microphorus drapetoides., Walker (the 

 only other described iSTorth American species), by its hyaline instead of 

 dark brown wings. 



Genus MYTHICOM YIA, Coquillett. 



ANALYTICAL KEY TO THE SPECIES OF MYTHICOMYIA. 



Tibi;¥, halteres, first vein and second section of costa, yellow rileyi. 



Tibia^, except at base, black ; npper side of knob of halteres also black, first Tein 



and costa brown 1 tibialis (p. 409). 



MYTHICOMYIA TIBIALIS, new species. 



2laJe. — Black, the frontal triangle, face, cheeks, humeri, and each 

 hind corner of thorax, whitish; halteres, except upper side of the 

 knob, hypopygium largely, knees and base of hind metatarsi, yellowish. 

 Head, sides of thorax, jdeura and scutellum, gray pollinose, abdomen 

 deep velvet black; pile of head and body whitish. Wings wholly hya- 

 line, veins black, the auxiliary and bases of the other veins yellowish. 

 On the under side of the hind metatarsi, before its middle, is a rounded 

 notch, in front of which is a rounded process. 



Type. — No. 3190, TJ.S.N.M.; length, 3h mm. A single male specimen 

 captured by the writer in July. 



Locality. — Los Angeles County, California. 



Genus RH AMPHOMYIA, Meigen. 



Rliamphomyiacrassinervis, Loew, is the other sex of B. sordida, Loew; 

 and his E. nmjulala is the other sex of R. timhilicafa, Loew. 

 The following have not been recognized by me, and the descriptions 



