22 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62, 
The only known species of Rueppellia, which occurs in Egypt and 
Abyssinia, has a venation very nearly like that of the species of 
Pherocera, but the wing is shorter and broader according to the figure 
given by Verrall in British Diptera; the antennae also have a three- — 
jointed style. 
Paratype.—Female, No. 25928, U.S.N.M. 
PHEROCERA ALBIHALTERALIS, new species. 
Plate 3, fig. 14. 
Female—Length 5.5 mm. Closely resembling P. signatifrons, the 
antennae being very nearly the same. Most of the frons, including 
the ocellar tubercle, shining black, flat; the narrow margins and the 
face silvery pollinose. Proboscis black, palpi brownish yellow, white 
pilose. 
Thorax black, the dorsum thinly gray pollinose, with a faint darker 
median stripe and two side spots. Scutellum with narrow shining 
black base, the rest whitish pollinose, with two black bristles. Pleura 
and coxae largely silvery gray pollinose, knobs of the halteres ivory 
white, stems brown. 
Abdomen brownish black, semishining; faint traces of gray pollen 
on the first two segments and basal half of the venter; the short, 
sparse pile whitish and reclinate; narrow posterior margins of first 
three segments whitish. Genitalia of nearly the same structure as in 
signatifrons, with very short black pile. Legs black with black bris- 
tles, basal half of front tibiae whitish, the brown of the apex extend- 
ing up some distance on the underside. Wings hyaline, the venation 
almost the same as in signatifrons (most of one wing broken off); 
stigma pale brown. 
Type locality—Alamogordo, New Mexico, June 6, 1902. 
Type.—Female, in the Philadelphia Academy of Natural Sciences. 
Only one specimen of this species is known. It is easily distin- 
guished from signatifrons by the color of the halteres and the mark- 
ing of the frons, and from flavipes by the general coloration. 
PHEROCERA FLAVIPES, new species. 
Plate 3, fig. 15. 
Female.—Length 5mm. Very much like the other two species of 
the genus in general appearance. General color black, with gray or 
silvery pollen and white, short, sparse pile. Frons shining black, 
narrow margins, and the face silvery pollinose; antennae apparently 
like those of the above-described species (the third joint broken off 
from one and the style from the other antenna). 
Dorsum of the thorax shining black, with two widely separated 
silvery pollinose vittae, the posterior half largely silvery gray polli- 
