478 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



short and thick, nearly" bare; palpi yellow, large and strongly bris- 

 tled, proboscis long, yellow, chitinous, projecting as far as end of palpi> 

 rather thin; thorax brown, shining, mesopleura bare; scutellum 

 rather broad and short, about three times as broad as long, two 

 widely placed, strong, marginal bristles; abdomen broad at base? 

 rather conical in shape, first segment rather longer than usual, about 

 as long as second, second dilated laterally and with a few weak bris- 

 tles, sixth segment elongate, very glossy, with several long pre apical 

 hairs, apex yellow, ovipositor brown; legs yellow, hind pair darker, 

 hind femora and tibise very strong, the dorsal ridge of latter promi- 

 nent; setulse (8-9) on apical two-thirds strong; costa to slightly 

 beyond middle, thickened on basal half, first division distmctly 

 longer than other two together, fork of third vein acute, third 

 division about one-fifth as long as second, fringe of moderate length, 

 widely placed and delicate, fourth vein distinctly bent at base and 

 evenly arcuate, ending slightly recurved at much in front of wing 

 tip ; halteres whitish yellow. 



Length, 2^-3 mm. 



One female, Plummers Island, Maryland, August 12, 1905 (E. A. 

 Schwarz); three females, Cabin John Bridge, Maryland, September, 

 1900 (no collector's name). These latter specimens are rather darker 

 in color than the type, and also a little smaller. 



Type.— Cat. No. 14869, U.S.N.M. 



APmOCHiETA ARIZONENSIS, new species. 



Male. — Black, hardly shining; frons dull, lower pair of post- 

 antennal bristles closer together but nearly as strong as upper pair, 

 center pair of bristles in first row nearer to outer bristles than to 

 post-antennals, and not much lower than the outer pair, antennae 

 large, oval, at least half as large as eye, black, arista nearly bare, of 

 moderate length, palpi black, paler at tip, normal in size and bris- 

 tling; thorax dull, one very long and strong mesopleural bristle situ- 

 ated rather low on mesopleura, the usual small bristles present; 

 abdomen dull black, segments subequal, no particularly noticeable 

 bristles, anal protuberance small brown-black, two weak terminal 

 hairs; legs black, only the anterior pair brownish, hind tibial setulse 

 indistinguishable; wings clear, costa to about two-fifths the wing 

 length, first division equal to about twice the other two together, 

 fringe very long on apical two-thirds, fourth vein slightly bent at 

 base and ending at distinctly in front of wing tip, seventh vein indis- 

 tinct; halteres black. 



Length, 1^ mm. 



One male, Williams, Arizona, June 30, 1901 (H. S. Barber). 



Readily distinguished by its black color and the very large third 

 antennal joint. 



Type.— C&t. No. 14870, U.S.N.M. 



