art. 4, REVISION OF THE FAMILY THEREVIDAE—COLE. am hve 
Male.—Length 9mm. In general darker in color than the female. 
The pollen of the frons gray with a yellowish tinge. Pile of the 
face largely whitish, that on the outer margin erect, black, and 
reaching to the cheeks. Pile of frons black and considerably longer 
than in the male. 
Thorax darker than in the female, less distinctly marked, the 
mesonotum in general more slate colored. Pile of mesonotum and 
scutellum largely black, erect, and rather long, with some shorter 
yellow pile. Pile of pleura largely yellowish white. 
First segment gray pollinose; posterior margins of segments two 
to six yellowish, with yellowish gray pollen which widens out later- 
ally. Venter colored much like the dorsum of abdomen, the yellow 
color and yellowish pollen more extended. Pile of dorsum sparse, 
black, rather long; pile on the venter yellowish. Genitalia yellowish 
red, the upper portion darker, the hypandrium with a long apical 
projection on each half (fig. 155), much longer than in any other 
species examined. 
Neallotype-—A male, collected in the mountains near Sheridan, 
Wyoming (Wm. Metz), [U.S.N.M.]. 
The neallotype is from the collection of J. M. Aldrich. It is an 
imperfect specimen, but the only other male examined is in worse 
condition; the third joint is missing from both antennae and one of 
each pair of legs is gone, otherwise the specimen is well preserved. 
Distribution.—The distribution according to two males and four 
females is: 
Montana: Gallatin Mountains, August 15, 6,000 feet [Mont. Exp. 
Sta.]. 
Wyoming: Sheridan, in mountains (Metz), [U.S.M.N. and Pomona 
College]. 
Colorado: Veta Pass, June 27 [U.S.N.M.]. 
THEREVA NEOMEXICANA, new species. 
Female.—Length 10.5 mm. Allied to frontalis Say and cingulata 
Kroéber, perhaps nearer to cingulata than to any other described 
species, differing from this species in having the pile of the face and 
occiput distinctly yellow instead of white. Antennae black, gray 
pollinose, with short black bristles and yellowish pile; third joint 
about as long as first and scarcely wider. The shining frontal cal- 
losity reaching to the ocelli and with a deep wedge of golden-yellow 
pollen below. 
Thorax black, pale brownish gray pollinose, with two whitish 
vittae and a very narrow dark-brown median stripe which widens 
posteriorly and crosses on to the scutellum; pile of the mesonotum 
mixed black and yellow. Scutellum gray pollinose and yellow pilose. 
