ART. 4, REVISION OF THE FAMILY THEREVIDAE—COLE. 79 
terior. The genus was founded on D, anilis, the only European 
representative. In the opinion of the writer Tabuda is best kept as 
a separate genus. 
DIALINEURA MELANOPHLEBA (Loew). 
Plate 9, figs. 108, 111, and 112. 
1876. Thereva melanophleba Loew, Zeitschr. Ges. Natur., new ser., vol. 14, p. 317. 
This small species should be quite easily recognized from Loew’s 
description and the figures given on plate9. In spite of the partially 
hairy face this species seems to fit well in the genus Dialineura, 
The female frons suggests Tabuda and Metaphragma more than 
Thereva. The types were collected in San Francisco, California, by 
Edwards, and are presumably in the Loew and Osten Sacken collec- 
tion in Cambridge. Ina female from Nevada the crossband on the 
frons shows blackish in certain lights beneath the blackish pile. 
Type locality —San Francisco, California (Edwards). 
Type.—In the Museum of Comparative Zoology at Cambridge. 
Distribution—The two males and one female examined were from 
the following localities: 
Nevada: No other data, in Loew collection [M. C. Z.]. 
California: San Francisco, May 25 (EK. C. Van Dyke) and February 
22 (F. X. Williams), [Cal. Acad. Sci.]. 
DIALINEURA CRASSICORNIS (Williston). 
Plate 9, figs. 109 and 110. 
1886. Thereva crassicornis WiLLIstoNn, Trans. Amer. Ent. Soc., vol. 13, p. 293. 
1893. Psilocephala crassicornis WiLLIston, Coquillett in Can. Ent., vol. 25, 222. 
Male.—Uength 11 to12 mm. Head black; eyes separated by only 
a pollinose line; ocellar tubercle gray pollinose; frontal triangle dark 
gray with silvery reflections, lighter on the sides. Jace and cheeks 
silvery white pollinose, also the lower occiput; upper occiput more 
gray; occiput and cheeks with dense white pile, which reaches up a 
short distance on the face. Palpi and proboscis black, white pilose, 
with a few black hairs. First antennal joint gray pollinose, about 
twice as long as the second and third combined, with long erect 
black bristles and white pile, a few of the hairs black (fig. 109); the 
second and third joints also gray pollinose, the second short black 
pilose; the style black, with a short apical bristle. Bristles of occi- 
put slender and black. 
Thorax and scutellum black, gray pollinose, darker on the meso- 
notum, with two light-gray vittae; mesonotum with erect black pile 
and more or less reclinate white pile, the bristles black; pile of scu- 
tellum long and white; four black marginal bristles. Pleura and 
coxae black, dense silvery gray pollinose and long white pilose, a 
