362 ERNEST A. BACK. 



abdominal segments dark brownish with the posterior margins and 

 angles broadly covered with golden bloom which, becoming gradually- 

 attenuated, reaches the anterior lateral angles, thus leaving the dark 

 basal two-thirds of the segments semi-circular; still looking at the 

 insect from above, there appears an interrupted golden line extending 

 from base to tip of the abdomen along the middle. 



Face and front, light golden pruinose; the occiput black, except at 

 the vertex, but light golden pruinose; palpi and antennae reddish, the 

 proboscis so only at the base; mystax, pile of palpi, beard and the 

 bristles on under side of the second antennal segment, occiput, pro- 

 thorax, coxae, before the halteres and on the sides of the first ab- 

 dominal segment, whitish or yellowish. Remaining hair of antennae, 

 dorsum of thorax and legs black; the bristles of the last two and the 

 scutellum black. Ground color of the pleurae chiefly black. The 

 median dorsal stripe is composed of two blackish lines extending from 

 the prothorax to the base of scutellum, narrowly separated by a line 

 of dull bloom as far as the transverse suture, thence united and soon 

 becoming reddish. Lateral stripes broad, attenuated, constricted on 

 the sides at the transverse suture but not bisected; the golden lines 

 separating the median and lateral stripes reaching from the prothorax 

 to the base of the scutellum. Abdomen stout, with blackish hairs on 

 the black part, on the golden pruinose areas and on the distal portion 

 yellowish; genitalia blackish above, reddish below, with long light 

 colored pile; the dark areas of the abdomen become brassy-yellow 

 pruinose in different lights, but when viewed from above, as described 

 above. Legs reddish-yellow; the tarsi, distally, reddish-brown. 

 Wings rather small, subhyaline, the veins blackish and broadly mar- 

 gined with fuscous; the fourth posterior cell with a comparatively 

 short peduncle. 



Type.—U. S. N. M., Cat. No. 11,027. A single male. 



Habitat. — Los Angeles Co., Cal. (D. W. Coquillett). 



This is one of the most striking species of Deromyia that I 

 have seen. 



The dorsal stripes are not now velvety black, though I half 

 suspect that they may be in fresh specimens. 



Deromyia rufesceiis. 



Dasypogon rufescens Macquart, Hist. Nat. Dipt., I, 295, 1834. 



Dasypogon rttfescens Walker, List, VI, 426. 



Dasypogon rufescens Osten Sacken, Cat., 1878,232 (note on type 



and syn.). 

 Diogmites rufescens v. d. Wulp, notes from the Leyden Mus., IV, 



76, 1882. 

 Deromyia rufescens Williston, Trans. Am. Ent. Soc, XI, 24, 1884 



(note) . 



