AMERICAN DIPTERA. 315 



Type.— Bigot collection. 



Habitat. — California (type). 



H. tenerum is a Chilian species. The points of similarity 

 between it and the above are " antennse at the base black 

 (rest wanting) * * hair of vertex, front and occiput black, 

 beard white; face of a pale yellow; * * coxas with white 

 reflections and white bloom * * legs polished, covered 

 with a white bloom beneath, pulvilli whitish. 



I have never seen either nitidiventris or tenerum, but doubt 

 the generic position of nitidiventris. 



Holopogon phseonotus. 



Holopogon phcBonotus Loew, Berl. Ent. Zeit., XVIII, 3G6, 1874. 

 $ . — -Length about 6 mm. — Translation. — Black; thorax opaque, with 

 very broad dorsal stripes, confluent, brownish-black, the median one 

 entire, the lateral ones abbreviated; humeri and the lateral margins 

 as far as the wings broadly grayish-white pruinose; wings grayish, veins 

 brownish-black. Oral margin, Ijasal segments of antennae, front, upper 

 half of occiput, thoracic dorsum, excepting the posterior angles and the 

 tarsi, black pilose; the scutellum covered with longer black and 

 shorter white pile. Mystax except the oral margin, posterior angles of 

 thorax, pleura?, abdomen, coxae, femora and tibia? white pilose ; the 

 stouter bristles of the tibiae and the bristles of the tarsi are black. A 

 truly normal Holopogon: 



Type. — M. C. Z. A single female specimen. 



Habitat. — Texas (type) ; Highrock, N. M. (June 2, Am. Ent. 

 Soc). 



This species is based upon a single female, which, by direct 

 comparison, differs so little from the female guttula that it is 

 almost impossible to separate them in a key. The legs are 

 wholly black. 



Holopogon seniculus. 



Holopogon seniculus Loew, Cent., VII, 62, 1866. 

 Holopogon seniculus J ones, Trans. Am. Ent. Soc, XXXIII, 279, 

 1907 (locality note). 

 <$ 9- — Length 5-7 mm. — Wholly black; easily distinguished from 

 all the other species herein described by the long white or whitish 

 pile of the head, thorax, basal segments of abdomen and legs, and by 

 the pure hyaline wings with yellowish veins. 



Black, polished; head and thoracic dorsum covered with a whitish 

 bloom, which on the middle of the dorsum is very thin, but more dense 



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



