AMERICAN DIPTERA. 171 



Face sordid white; mystax ver>^ sparse, white; front and occiput in 

 certain hghts almost brownish-gray, bristles of occiput very fine, 

 whitish; the ocellar tubercle polished black. Proboscis black, at ex- 

 treme base yellowish. Antennae reddish, the third segment rather 

 oval, darker than the basal segments and considerably shorter than 

 the bristle-like style. Thorax dark testaceous; the dorsum light 

 brownish pruinose with an indistinct median line of lighter bloom 

 extending from the pronotum to the base of the scutellum; lateral 

 margins, posterior callosities, pleurae and scutellum with a moderately 

 dense light brownish-gray bloom which before the halteres is more 

 white; bristles of dorsum fuscous. Halteres with sordid yellow pedun- 

 cle and darker knobs. Abdomen brown, the lateral margins rather 

 broadly, and the posterior margins of the segments more narrowly, 

 grayish pruinose; the scant pile of the abdomen whitish. Front and 

 middle legs when viewed from below appear whitish, the tibi« and 

 tarsal segments tipped with red; when viewed from above, the tibiae, 

 especially the middle pair, are more brownish-yellow; the femora are 

 whitish toward the base, but more reddish-yellow on the distal two- 

 thirds and bear on the outer part an ill-defined dark ring, which on the 

 front pair scarcely meets below, but is more distinct on the middle 

 pair. The hind femora slender at base but gradually incrassate dis- 

 tally; the slender basal portion whitish below, above and without 

 brownish-black; the swollen portion brownish-black with two distinct 

 and prominent yellow rings. Hind tibiae moderately thickened with 

 white terminal bristles, and, not counting the extreme base, black; 

 four-banded as follows: — band 1, whitish; bands 2 and 4, dark brown- 

 ish; band 3, reddish-yellow; the dark color of the second band extends 

 upward in a narrowing line on the inner and outer sides of the first 

 band. Hind metatarsi white with white bristles, the following segments 

 and their bristles blackish. Claws stout, wholly black; empodia 

 wanting. Wings hyaline, slightly tinged with a darker color; the 

 second submarginal cell about three times the length of its peduncle, 

 the second posterior much longer than the third posterior, with its 

 base slightly nearer the base of the wing than that of the second sub- 

 marginal, the fourth posterior cell with a short peduncle. The anterior 

 intercalary vein does not form a distinct angle with that portion of the 

 posterior cross- vein which closes the second posterior cell behind. 



Type. — Brooklyn Institute. A single female. 



Habitat. — Brownsville, Texas, May (type). 



Another specimen from the same locality, but collected in 

 April, agrees with the type specimen except that the bloom 

 of the pleurae appears lighter in color and the posterior por- 

 tion of segments 2-4 of the abdomen is noticeably yellowish, 



TRANS. AM. ENT. SOC, XXXV. MAY, 1909. 



