284 Annals Entomological Society of America [Vol. VI, 



pale yellow, fore tibia and tarsi brownish; mid tibia without posterior 

 bristles. Wings very similar to those of parvicella; subcostal vein 

 incomplete; fourth vein not so indistinct as in parvicella. 



Halteres yellow. 



Length, 2 mm. 



Type: Cat. No. 15562, U. S. N. M. 



Locality: Glacier National Park, Montana, (Hopkins 

 No. 5932c.), one female. 



10. Agromyza davisi Walton. 

 Plate XXVIII, Fig. 7. 

 Syn: Agromyza davisii Walton.. Ent. News Vol. 1912. 



Female: Frons opaque, clear yellow, slightly broader than long, 

 slightly more than one-third as wide as head, ocellar region shining 

 black, orbits blackened posteriorly, back of head black; four pairs of 

 orbital bristles present, the lower pair much the weakest; besides those 

 bristles there is a row of short hairs, nearer to eye margin, almost on 

 the whole length of orbit; antennae above the average size, deep black, 

 third joint subquadrate, covered with very fine short pilosity; arista 

 gradually tapering, almost bare, as long as from its base to vertex; face 

 brown, almost perpendicular, slightly keeled, mouth margin not pro- 

 duced, cheeks opaque, clear yellow, higher posteriorly than anteriorly, 

 but at highest part only about one-fourth as high as eye-height; pro- 

 biscis yellow; palpi black. Mesonotum opaque gray, four pairs of 

 dorso-central bristles present, anterior pairs slightly weaker than the 

 posterior two pairs; between the dorso-centrals there are on the anterior 

 half of disk ntmierous setulae which are irregularly arranged, but which 

 represent at least four rows; anterior pair of dorso-centrals as widely 

 placed as posterior pair; all bristles on margins very long; pleurse sub- 

 shining gray black, the upper margin narrowly yellow, as well as a 

 patch below wing base, and the suture behind middle coxae; squamae 

 pale whitish yellow, fringe concolorous; scutellum concolorous with 

 mesonottmi, four marginal bristles present; postnotum shining black. 

 Abdomen brownish black, apices of segments yellowish, ovipositor 

 glossy black, distinctly longer than sixth segment; all abdominal seg- 

 ments with scattered hairs, which are strongest on the posterior mar- 

 gins. Legs black, knees narrowly yellowish; mid tibia without pos- 

 terior bristles. Wings with costa to slightly beyond third vein, outer 

 cross vein below one-fourth from end of first costal division, and at 

 about one-half its own length from inner cross vein; discal cell shorter 

 than lower basal cell; third and fourth veins regularly divergent on 

 their last sections; fourth vein indistinct from outer cross vein; last 

 section of fifth vein about two times as long as penultimate section. 



Halteres yellow. 



Length, 2.5 mm. 



Type: Cat. No. 15563, U. S. N. M. 

 Locality: Lafayette, Ind. (J. J. Davis). 



