NEW GENERA AND SPECIES OF MUSCOID FLIES. 



By Charles H. T. Townsend, 



Custodian of Muscoid Diptera, United Stales National Museum. 



During the past year or two many new forms of muscoid flies have 

 been described by the writer, and the manuscripts placed with various 

 serial publications. A large part of the descriptions has already been 

 published, but a considerable portion of them has not yet appeared. 

 The present paper contains descriptions of the most noteworthy 

 remaining new muscoid genera thus far studied in the United States 

 National Museum collection. Tlie forms here treated are from North 

 and South America, Eurasia, and Malaysia, with one from Australia. 



Family MUSCIDAE. 

 TRONGIA, new genus. 



Genotype. — Trongia viridis, new species. 



Seems to approach Catajncephala, differing in f acialia thi<3kly ciliate 

 with ordinary bristles to a little above middle, and head but slightly 

 broader than the thorax. Strong approximated proclinate ocellar 

 bristles. One strong reclinate imier orbital bristle in male; inner 

 verticals cruciate, outer almost as long as imier. Vertex about one- 

 sixth head-width. Oral margin very prominent; the strong vibrissae 

 practically on same, and not narrowing the facial plate. Third 

 antennal joint six or seven times second, narrow, of even width, 

 rounded apicaUy. Arista plumose almost to tip. Claws slender, 

 extremely long, almost twice last tarsal joint. Two strong median 

 marginal macrochaetae on second segment; marginal row of strong 

 ones on third and fourth segments. Hypopygium not prominent. 

 Cubitus subangular, last section of fourth vein evenly bent in, apical 

 cell open well before wingtip. Proboscis short and fleshy. Tegulae 

 bare. 



TRONGIA VIRIDIS, new species. 



Length of body, 13.5 mm.; of wing, 11.75 mm. One male, Trong, 

 Lower Siam, February, 1899 (W. L. Abbott). 



All metallic green; face and front lightly golden or brassy, cheeks 

 silvery; antennae, palpi and pulviUi pale fulvous, the third antennal 



Proceedings U. S. National Museum. Vol. 5I-No. 2152. 



