AMERICAN DIPTERA. 361 



Deromyia platyptera. 



Diogmites platypterus Loew, Cent., VII, 36, 1866. 



Deromyia platyptera Jones, Trans. Am.Ent. Soc, XXXIII, 280, 



1907 (locality note). 



% 9 • — Length 16-20 mm. — Black, the wings of the same color, the 



thorax, excepting the dorsal stripes, brownish, or brownish-black f 



antennae and legs yellowish; face golden pruinose; mystax whitish; 



palpi black-haired. 



Black; face and front pale golden pruinose, the mystax whitish; 

 the face immediately above mystax with a few black inconspicuous 

 hairs. Occiput brownish pruinose, and, together with the front, with 

 black hair and bristles. Antennae reddish-yellow, the second seg- 

 ments nearly twice as long as the first; both with black hair; third 

 segment with blackish hair on the basal half; style black. Palpi black 

 or brownish with black hair. Thorax, excepting the black dorsal 

 stripes wholly brownish or brownish-black, rather more bare; the 

 short hair and all the bristles black. Scutellum of like color with black 

 bristles. Abdomen almost uniformly black, nearly opaque, toward 

 the tip polished; the bristles on the sides of the first segment and the 

 short hair of the entire tergum, black. Hypopygium polished black, 

 black pilose. Coxae of same color as pleurae, with scant blackish hair. 

 Legs sordid yellowish, the tibiae reddish, tips of tibiae and of the tarsi 

 and the claws black; pulvilli yellowish-white; hair and bristles wholly 

 black. Halteres brownish, the knob often yellowish. Wings broad, 

 black or blackish, paler toward the posterior angle. 



Type. — M. C. Z. Two male specimens; one with abdomen 

 wanting. 



Habitat.— III. (type); Carbondale, 111. (Aug. 11, G. H. 

 French) ; Peru and Union, Neb. (P. R. Jones) ; Ames, Iowa 

 (J. M. Aldrich); Opelousa, La. (June, C. W. Johnson)- Miss. 

 (Sept., D. W. Coquillett). 



This species is most easily recognized by the contrast be- 

 tween the black head and abdomen and the brownish thorax. 

 In some specimens the dorsum of the thorax is quite blackish- 

 brown and shows almost no trace of the stripes, and in some 

 greased specimens the stripes do not show. The wings vary 

 in intensity of their color; one specimen has the wings very 

 black with the centers of the discal, second, third, fourth and 

 fifth posterior, anal and auxiliary cells clear. 



Deromyia pulchra. 



%, . — Length 26 mm. — -Brassy-yellow pruinose, the golden pruinose 

 lines separating the three blackish thoracic stripes extending from the 

 humeri to the base of the scutellum; when viewed from above, all the 



TRANS. AM. ENT. SOC, XXXV. (46) SEPTEMBER, 1909 



