ART. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 27 
EPOMYIA RUFIVENTRIS (Loew.) 
Plate 4, figs. 19, 25, and 37. 
1869. Psilocephala rufiventris Loew, Berlin. Ent. Zeitschr., vol. 13, p. 12. 
Male.—Length 5.5mm. to 6.5mm. Head black, face and most of 
the frons silvery white pollinose, the upper corner of frontal triangle 
velvety black. Pile of proboscis and palpi short, brownish. First 
two joints of antennae yellowish, with short black hairs, the third 
joint slightly longer than the first two combined and wider than either. 
Occiput thin silvery pollinose and white pilose; post-ocular bristles 
black. 
Thorax black, largely blue-gray pollinose, a large velvet black spot 
over the humeri, reaching back to the suture; two silvery vittae in- 
side the black spots; a few whitish hairs on the mesonotum. Scu- 
tellum velvet black, without pile, on disk its base narrowly grayish, the 
margin with about four short black bristles. Pleura black, blue gray 
pollinose with sparse white pile. Knobs of halteres large, blackish, 
the stem paler. Pteropleura shining black. 
Abdomen black, first three segments silvery gray pollinose, the 
fourth to sixth segments shining black; a few black hairs on sixth 
segment, the rest of the abdominal pile white. Genitalia reddish 
yellow with reddish bristles and hairs. The second abdominal seg- 
ment is as long as the fourth, fifth, and sixth combined. Femora 
black, tibiae black with brown tips; fore tarsi entirely blackish, 
dilated, with short black pile; hind tarsi yellow except the tips (in 
some specimens only the base yellowish); femora with reclinate sil- 
very white pile. Wings whitish hyaline, with an apical gray spot on 
R-4 and a spot near the middle of the wing (remnant of a crossband 
found in the female); cell M—3 closed, the stigma brown. The mark- 
ings on the wings of some males are almost obsolete. 
Female.—Length 7 to 9 mm. Many characters like the male. 
Frons narrow, shining black above, the lower half and ocellar tuber- 
cle silvery gray pollinose; in the center of the frons a small trans- 
verse velvet black spot. (Fig. 25.) Antennae pale brown, first two 
joints more or less yellowish. 
Thorax nearly as in the male, the pile very short, reclinate, and 
yellowish; bristles short; a few short erect hairs on margin of scutel- 
lum. Pleura blackish gray pollinose, the pteropleura bare and 
shining; very short pile on pleura and coxae. Knobs of halteres 
brown, the stems paler. 
First abdominal segment blackish, gray pollinose and with very 
short yellowish pile; the rest of the abdomen usually bright reddish 
yellow, the incisures darker, the venter the same as the dorsum; pile 
of first three segments pale, beyond this short, black, erect. Short 
yellow pile on the genitalia and the circlet of bristles yellowish. 
