ART. 4, REVISION OF THE FAMILY THEREVIDAE—COLE. 119 
upper corner of frontal triangle dull brown. Pile of frons and outer 
margin of face long and black, on most of the face dense and white; 
some black pile on the cheeks below the eye. Antennae as described 
by Loew for the female. 
Mesonotum gray pollinose with three indistinct brownish vittae, 
the median one divided by a darker brown line; pile of mesonotum 
rather long, dense, erect, and black. Pleura gray pollinose and dense 
white pilose, a few darker pile before the wing base. Coxae with 
dense white pile. Stem of halteres yellow, the knob brown. 
Abdomen largely black in ground color, first segment gray polli- 
nose, the tergites of other segments largely shining blackish brown; 
posterior margins of segments yellow, with a border of gray pollen 
widening laterally. The color of the venter is probably blackish 
brown in mature specimens with yellow posterior margins. Pile on 
sides of abdomen and on venter long and whitish, the dorsum largely 
black pilose; genitalia brownish with black pile above and white 
below. Four front femora blackish brown, the hind pair dark above, 
yellowish beneath; pile of femora largely white, intermixed with long 
black pile on the posterior side of the four front femora. Wings 
grayish hyaline; cell M-3 closed. 
Female.—Length 13 mm. In the single specimen the upper two- 
thirds of frons is shining black and bare of pollen; in fresh specimens 
there may be a narrow pollinose line along the orbits; lower third of 
frons golden-yellow pollinose and black pilose. Face whitish polli- 
nose, the white pollen reaching slightly above the base of the antennae; 
pile short and white, a few black pile on the outer margin above. 
The mesonotum is dark-gray pollinose with a broad central blackish 
brown vitta reaching to scutellum and two broad stripes, one on either 
side, abbreviated before the humeri and scutellum and separated from 
the median stripe by a distinct yellowish pollinose line which broadens 
out anteriorly. Base of scutellum blackish brown, the broad margin 
gray pollinose, the pile yellow. 
First abdominal segment gray pollinose, the rest of dorsum largely 
shining black; posterior margins of second to sixth segments bright 
golden yellow, just in front of which there is an area of yellowish gray 
pollen, widening laterally; third abdominal segment largely black 
pilose. Venter thinly gray pollinose, the pile and posterior margins 
as on the dorsum. Genitalia with a circlet of reddish spines. Middle 
pair of legs missing. Anterior femora blackish, brown at extreme 
base, the posterior femora blackish brown above and reddish below; 
pile of femora short and whitish. Costal cell of wing brown. 
The male and female examined were from the following localities: 
Vermont: Burlington, June 24 [B. 8. N. H.]. 
New Hampshire: Glen House, July 3 [B. S. N. H.]. 
