312 Annals Entomological Society of America [Vol. VI, 



37. Agromyza parvicornis Loew. 



Plate XXIX, Fig. 11; Plate XXXI, Figs. 35, 37. 



Syn: Agromyza parvicornis Loew. Dipt. Amer. Sept. Indig., Cent. 8, 1869, 

 species 92. 



Male and Female: Frons black or black-brown, opaque, orbits 

 slightly shining, black, four orbital bristles present; orbits difleren- 

 tiated from center stripe, bristles situated nearer inner than outer 

 margin of orbits, a few weak hairs in an irregular row laterally beyond 

 them; antennas brown or brownish black, rather below the normal size;, 

 third joint short, rounded in front, thickly covered with soft, short, 

 whitish pilos'ty; arista brown, generally yellowish near base, except 

 on the short thickened portion which is glossy black; pubescence very 

 close, generally distinct; length of arista equal to from its base to upper 

 orbital bristle; face brown, nearly perpendicular in profile, the central 

 keel slight ; cheeks brown, or yellowish brown, very much higher poster- 

 / iorly than anteriorly, at highest part one-third as high as eye; marginal 

 bristles numerous; vibrissa differentiated, but not very strong; proboscis 

 brown; palpi black, very slightly dilated, weakly bristled. Mesonotum 

 glossy black; disk thickly covered with short setulas; two pairs of 

 dorso-centrals present; the bristles between the posterior pair distinct; 

 pleurae, scutellum and postnotum concolorous with disk of mesonotuin, 

 pleural sutures rarely, and beneath wing bases generally yellowish; 

 squamae whitish yellow, fringes brown. Abdomen colored as thorax; 

 hypopygium of male as Fig. 35, Plate XXXI. Legs black, the tibi« and 

 tarsi sometimes paler, brownish yellow, most distinct on knee joints; 

 mid tibia with the posterior bristles distinct. Wings clear, slightly 

 grayish on anterior half; venation as in figure, halteres yellow, 

 the knob whitish. 



Length 3-4 mm. 



Originally described from District of Columbia, (Osten 

 Sacken). Larva lives in mines in leaves of corn; occurs in the 

 following states: Florida, District of Columbia, Indiana, 

 Vermont, Maine, Massachusetts, Connecticut, New Hamp- 

 shire, Wisconsin, Alabama, South Carolina, Illinois and Texas. 

 Probably generally distributed throughout the United States. 

 A full list of localities will be given in the bulletin in preparation 

 dealing with the economic importance of this species and several 

 others affecting field and forage crops. 



