I7 2 ENTOMOLOGICAL NEWS. [April, '14 



punctures; prescutum with a complete, longitudinally foveolate fur- 

 row; notauli foveolate, U-shaped posteriorly where they are more 

 strongly foveolate but are not depressed; suture between the scutum 

 and scutellum with three strong longitudinal rugae; scutellum shin- 

 ing, with a few fine punctures ; dorsal aspect of the propodeum 

 coarsely reticulate and not separated from the posterior aspect which 

 is also coarsely reticulate; mesepisternum ' reticulate, more strongly 

 so anteriorly, with a rather small, shining, punctured spot on the 

 posterior part; sides of the propodeum strongly reticulate; first ter- 

 gite coarsely, longitudinally striato-reticulate, the striae predominat- 

 ing, no complete, well defined median stria; second and third tergites 

 sculptured similarly to the first, but not so strongly so; the apex of 

 the third tergite almost impunctate and shining, as are the follow- 

 ing tergites. 



Black; palpi pale brown; mandibles, scape, pedicel, tegulae in part, 

 ruf o-ferruginous ; legs ferruginous ; wings hyaline, iridescent, vena- 

 tion pale brown, stigma dark brown. 



Chain Bridge, District of Columbia. Described from one 

 female recorded under Bureau of Entomology Number Hopk. 

 U. S. 102193, collected by Mr. C. T. Greene and reared from 

 species of Agromysa. A paratype from Ithaca, New York. 



Type. Cat. No. 16474, U. S. N. M. 



New American Diptera. 



By J. R. MALLOCH. 



The species included in this paper are described from types 

 in the Academy of Natural Sciences, Philadelphia. 



Hydrotaea cressoni, new species. 



Male. Glossy black, with a distinct, bluish tinge. Frontal lunule, 

 face and eye margins beneath level of antennae silvery pollinose. 

 Proboscis and palpi black. Mesonotum without any indications of 

 stripes or pollinosity. Abdominal segments 3, 4 and 5 with a very 

 distinct, elongate, anterior marginal spot on each side, forming an in- 

 terrupted white fascia on each segment. Legs black. Wings clear. 

 Calyptrae white, margins and fringe yellowish. Halteres yellow. 



Eyes distinctly, but not thickly, pubescent; frontal stripe narrow; 

 third antennal joint not twice as long as second; arista with an elon- 

 gate swelling at base, microscopically pubescent; cheeks linear, bris- 

 tles numerous and moderately strong; palpi elongate, with numerous 

 hair-like bristles. 



