288 Annals Entomological Society of America [Vol. VI, 



of Agromyza with the costa to third vein only. This char- 

 acter is not of such importance that it may be considered 

 as of generic value, and I therefore am not using Rondani's 

 generic name Domomyza, as species which are very dissimilar 

 are thrown together in Domomyza, and thus separated from 

 forms to which they are more closely allied in Agromyza. 



14. Agromyza nitida, new species. 

 Plate XXVIII, Fig. 1; Plate XXX, Fig. 26. 



Female: Frons reddish yellow, distinctly longer than broad- 

 ocellar region black; vertex and orbits posteriorly blackened; upper 

 parts of frons shining, lower and central parts opaque; five pairs of 

 moderately strong orbital bristles present, w^hich are of almost uniform 

 size and situated nearer to inner margin of orbits than to eyes; face 

 slightly keeled, brown, in profile a little concave; antennas brownish 

 yellow, very short, second joint almost bare, the dorsal bristle weak, 

 third joint longer than broad, twice as long as second, regularly rounded 

 at apex; arista brcmni, slightly thickened at base, almost bare, not as 

 long as half the length of from its base to vertex; cheeks yellow, lower 

 margin narrowly shining black, in outline 4ower margin rounded, height 

 posteriorly rather less than one-third that of the vertically elongate eye, 

 anteriorly not so high; marginal bristles very weak, vibrissa present but 

 not strong; proboscis yellowish brown; palpi concolorous, small, not 

 dilated, bare. Thorax rounded above; mesonotum about one-third 

 longer than broad, glossy black, covered on the disk with short setulose 

 hairs, two pairs of rather widely placed, post-sutural, dorso-central 

 bristles present, the pair of strong hairs between the posterior pair 

 absent; humeri pale yellow, margins of mesonotum brownish; pleurse 

 brownish-black, glossy, upper margin narrowly yellow along suture; 

 in front of wing base also yellowish; squamas yellowish, the margin and 

 fringe brown; scutellum rounded, concolorous with mesonotum, four 

 marginal bristles present. Abdomen glossy black-brown, segments 

 with an indication of a linear, yellow, posterior margin; ovipositor 

 glossy black, barely longer than preceding segment; all abdominal 

 segments with scattered hairs, those on the apical segment not much 

 longer than the others. Wings grayish; auxiliary vein complete, but 

 indistinct; second costal division about two and one-third times as 

 long as first; outer cross vein situated directly below end of first vein 

 and at its own length from inner cross vein, portion of fourth vein 

 anterior to inner' cross vein slightly more than twice as long as section 

 beyond it; third and fourth veins regularly divergent on the whole of 

 the last section, latter much less distinct than the longitudinal veins 

 anterior to it; penultimate section of fifth vein one-third as long as 

 ultimate section; costa reaching slightly beyond end of third vein. 

 Halteres with yellow stalk and white knob. 



Length, 1.5 mm. 



Type: Cat. No. 15566, U. S. N. M. 

 Locality: Cabin John Bridge, Maryland, April 28, 1912, 

 (Knab and Malloch). Food-plant unknown. 



