1916] Malloch — The Genus Agromyza {Dipfera) 51 



Agromyza subangulata sp. no v. 



Male: Black. Head black, only the apex of proboscis yellow; 

 frons opaque, brown-black, orbits subshining; lunule whitish 

 pollinose. Thorax shining black, disc of mesonotum distinctly 

 brownish pollinose, central vertical suture and upper margin of 

 pleurae from wing base nearly to anterior extremity narrowly 

 lemon-yellow; roots of wings lemon-yellow; scutellum concolorous 

 with disc of mesonotum. Abdomen unicolorous glossy black. 

 Legs black; fore knees and bases of tarsi yellowish. Wings clear, 

 bases of thick veins lemon-yellow, remainder brown. Squamse 

 pale yellow, fringe concolorous. Halteres pale yellow. 



Frons more than a third the width of head; orbits distinct, each 

 at widest part about half as wide as is center stripe at same part; 

 five orbital bristles present, which are of moderate length, slightly 

 decreasing anteriorly, the anterior two pairs incurved ; orbital hairs 

 sparse; antennae small, third joint disc-like, slightly pilose; arista 

 bare, tapering, its length about one third more than anterior width 

 of frons; face very slightly receding below; cheek very narrow, at 

 middle about one eighth as high as eye, the latter about one and a 

 third times as high as long; marginal hairs not very numerous, but 

 distinct, vibrissa moderately differentiated. Mesonotum with 

 four pairs of dorso-central bristles; discal setulae rather long and 

 hairlike, about eight rows between the anterior dorso-centrals; the 

 pair of bristles between the posterior dorso-centrals hardly dis- 

 tinguishable from the discal setulae. Abdomen ovate; surface with 

 many setulose hairs; hypopygium of normal size. Legs normal; 

 mid tibiae with the posterior bristles small. Wing with costa to 

 end of fourth vein; veins 3 and 4 distinctly divergent at apices, 

 reaching wing margin at about equal distances before and behind 

 wing tip respectively; inner cross-vein in vertical line with apex 

 of first vein, and distinctly beyond middle of discal cell; outer 

 cross-vein distant its own length from inner; last section of fourth 

 vein four times as long as penultimate section; last section of fifth 

 subequal with the preceding section; auxiliary indistinct but com- 

 plete; sixth vein reaching three fourths of distance to wing margin. 

 Length, 2.5 mm. 



Type locality, St. Joseph, 111., May 3, 1914 (Hart and Malloch). 

 Food plant unknown. 



