NO. 1945. NEW DIPTEROUS INSECTS— MALLOCH. 657 



one and one-half times as long as greatest breadth, hypopygium very 

 inconspicuous. Legs somewhat similar in form and chsetotaxy to 

 some species of Fannia but in one specimen there is a distinct bristle 

 on the ventral surface of the mid tibia, which I consider abnormal. 

 Wing venation as in Fannia. 



Type of genus — Steinomyia steini, new species. 



STEINOMYIA STEINI, new species. 



Male. — Black, shining; frontal orbits silvered, frontal stripe vel- 

 vety black, face brown, gray dusted; besides the vibrissse there are 

 3-4 smaller bristles external to the anterior pair; palpi black, of 

 moderate length, with hau"-like bristles; proboscis as in Fannia, 

 antennas black, third joint 2^ times as long as second, gray pruinose. 

 Mesonotum unstriped, the sides white dusted; pleurae white dusted, 

 scutellum concolorous with mesonotum. Abdomen with very slight 

 whitish surface dusting, no trace of any dorso-central stripe; second 

 segment shghtly longer than third, third and fourth subequal, fifth 

 longer than second, first very short, all segments with numerous 

 short discal hairs, second with long lateral, third and fourth with 

 long lateral post-marginal, and fifth with several long lateral and two 

 apical bristles; on ventral surface the last segment is distinctly bris- 

 tled; hypopygium black, gray prumose, symmetrical, the two rounded 

 lateral plates inclosmg the genital organs each with one long and sev- 

 eral shorter apical bristles, ventraliy the organs are yellowish brown. 

 Legs black; fore femora with three rows of bristles, one on each of 

 the three posterior surfaces, fore tibiae with one bristle at near to 

 apex on dorsal surface, mid femora not distinctly constricted on 

 apical third, antero-ventral surface with a series of 7 evenly spaced 

 bristles on basal three-fifths the last two of which are distinctly 

 stronger than first five, beyond these is a series of about 12 comblike 

 short bristles which decrease slightly toward tip, antero-dorsal row 

 of 16 bristles decreasing slightly in size beyond middle and the last 

 3-4 at apex suddenly enlarged, postero- ventral row with 1 very 

 long hairlike basal bristle, 9 hairlike bristles on basal two-thirds, 

 and 2 strong and several successively weaker bristles on apical 

 third, posterior row long and hairlike except apical 3-4 which are 

 strong; mid tibiae slightly thickened on apical two-fifths, the pubes- 

 cence barely longer on ventral surface than on dorsal, one antero- and 

 one postero-dorsal bristle at apical third and one dorsal bristle at 

 apex; hind femora bare on antero-ventral surface, two long bristles 

 on apical third of postero-ventral surface and the normal curved pos- 

 terior row present, the last 3 being strongest; hind tibiae slightly 

 bent, antero-dorsal surface with a continuous row of short bristles 

 (17-18) the last (apical) 3-4 strongest and most widely spaced, the 

 usual 2 dorsal bristles as in Fannia, antero-ventral surface with 1-2 

 48702°— Proc.N.M.vol.43— 12 42 



