72 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 62. 
21; De Funiak Springs, October 17 [Amer. Mus.]; Gotha, March 
[Cornell]; Turkey Creek, March 3; Anna Maria Key, March 30; Seven 
Oaks, May 1 (M. C. Van Duzee), [all M. C. Van Duzee]. 
PSILOCEPHALA SENILIS (Fabricius). 
1805. Bibo senilis Fasricius, Syst. Antliat., p. 68. 
1821. Thereva senilis WIEDEMANN, Exot. Dipt., vol. 4, p. 112. 
Kroéber redescribes the species from two poorly preserved speci- 
mens in his paper on the North American Therevidae, but his de- 
scription is quite complete. The male was from Brazil, the female 
from Savannah, Georgia; these specimens were not acquired by the 
National Museum. It would be difficult to place the species with 
relation to others without seeing specimens. 
PSILOCEPHALA POLLINOSA, new species. 
Plate 8, fig. 92. 
Male.—Black, white pollinose. Frons black, silvery white pollinose, 
with a central depression, deeper above the antennae. Antennae 
short, black, the first and second joints with short black bristles; 
third joint almost as long as the first and second combined and a 
little wider; the arista short. (Fig. 92.) Face silvery white polli- 
nose; palpi black, white pollinose. Occiput whitish pollinose and 
pilose, the post-ocular bristles black; short pile on ocellar tubercle 
black. 
Thorax black, the mesonotum and pleura rather long, erect white 
pilose and gray pollinose; scutellum the same color, almost shining 
black in the middle, with four black marginal bristles and long white 
pile. Knob of halteres largely yellowish, whitish pollinose, the basal 
part and stem blackish. 
Abdomen black, gray or silvery gray pollinose, long silvery white 
pilose, reclinate on the dorsum, more erect on the sides and venter; 
sixth and seventh segments very short, the fifth, sixth, and seventh 
combined about equal to the third. Genitalia black on the exterior, 
short yellowish pilose on the upper part, long on the hypandrium 
and with a few black hairs in the center; the exterior genitalia gray 
pollinose. Femora, tips of tibiae, and tarsi except base black; base 
of tarsi and tibiae yellowish; femora with short white pile; bristles 
of legs black. Wings hyaline, R-1 yellow, the rest of the veins and 
the stigma brown; cell M—3 wide open. 
Holotupe.—A male collected at Tuolumne Meadows, California, 
August 1, 1915 (C. L. Fox), [Cal. Acad. of Sciences]. 
In general appearance this species resembles limata. It stands 
near the genus Dialineura in some respects, but the antennae are 
of different structure. 
