656 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. ^ 



shining at apices and with distinct whitish lateral post-marginal 

 dusting; basal fringe very short, black; scattered black hairs on 

 lateral margins of segments, those on apical segment more distinct 

 and extending to disk; hypopygiiim large, distinctly cleft on left 

 side, apical depression absent; the ventral processes large. (See 

 fig. 2.) Legs black, only the extreme apices of femora and bases of 

 tibiae yellowish; fore and mid femora whitish dusted posteriorly, hind 

 femora glossy posteriorly; ventral thorns present on apical half of mid 

 femora only, no long pubescence, either on femora or tibiae, all femora 

 slender; hind tibiae \vith rather distinct setulose hairs on apical half 

 of antero-dorsal surface, and apical half of postero-ventral surface as 

 well as same surface of basal hind tarsal joint with short, stiff, golden 

 hairs; claws as long as apical joint of tarsi, which have three long 

 apical hairs. Wings grayish, stigma slightly short of end of auxiliary 

 vem, second costal division twice as long as third; inner cross vein 

 at just beyond end of auxiliary vein and at sHghtly short of basal 

 third of discal cell, outer cross vein straight, at its own length from 

 apex of fifth vein, outer portion of fourth vein straight. Halteres 

 brown, pale at base of knob. 



Length. — 2 mm. 



Type.— Cat. No. 15309, U.S.N.M. 



One male, Plummers Island, Maryland, October 12, 1912 (H. L. 

 Viereck). 



AUied to sfigmatica MaUoch and also to altematus Cresson. The 

 unthickened costa readily separates it from the former and the smaller 

 size and differently shaped antennae from the latter. 



STEINOMYIA, new genus. 



Eyes in male separated at vertex by one-fifth the width of head, 

 besides the strong cruciate frontal rows of bristles situated on the 

 inner edge of the orbits there are two pairs of strong bristles situated 

 on the orbits, the upper, backwardly directed pair slightly in front of 

 the anterior ocellus and the lower, outward and slightly backwardly 

 directed pair the breadth of frons lower down from these, in addition 

 to these bristles there is a continuous row of short setulse from upper 

 angle of orbits to lower angle of frontal stripe; lower margin of frons, 

 at above antennae, twice as wide as at vertex. Sides of face diver- 

 gent, one- third wider at epistome than at base of antennae, orbits 

 higher than facial ridge, vibrissEe strong, incurved, the upper strong- 

 est, not continued to apex of thu'd antennal joint, in profile the head 

 is as in Fannia. Antennae shorter than face, arista very indistinctly 

 pubescent. Mesonotum with 2 pairs of presuturals and 3 pairs of 

 postsuturals ; acrosticals in three rows; 2 sternopleurals, 5-6 meso- 

 pleurals, and 2 moderately strong discal scutellar as well as the nor- 

 mal marginal bristles and discal hairs. Abdomen ovate, flattened, 



