Specific Characters in the Bee Genus Colletes 39 
lateral tufts of whitish hair, the disks of the segments with a very minute 
and thin pale pile, apex with a few black hairs. 
3. Length 8 mm. Differs from the 2 as follows: Clypeus dull and 
honeycombed with punctures except at the shining, impunctate apex, cov- 
ered with pale, grayish white hair, the face above with long, thin, white 
hair; thoracic dorsum with erect, very thin, whitish hair, nowhere mixed 
with black or brown; sides of vertex quite impunctate; antennae long, 
flagellum brownish below and distinctly punctured, joint 3 shorter than 4, 
taken with 2 about — to 4 or 5, the proportion being 2:3:5:5, median joints 
one and one-half times as long as broad; basal joint of hind tarsi nearly 
four times as long as broad, median joints three-fifths as broad as long; 
malar space two-thirds as long as broad; claws equally cleft at apex; apical 
margins of segments 1-5 depressed and with thin, narrow, loose, white 
fasciae. 
Genitalia.—Stipes notched, its apex small, blunt and sparsely fringed, 
the basal and middle sections very stout; sagittal rods basally dilated, me- 
dially internally toothed, apically slender, the tips of the wings divergent; 
volsella small; seventh ventral plate fan-shaped, the external costa recurved 
downwards, internah costae with long hair, the lobes with short dense bris- 
tles except basally. (Plate 2, figures 9 and 9a.) 
Type Locariry.—Carlinville, Illinois; type in Eee of Mr. 
Charles Robertson. 
A unique male taken at Carlinville on flowers of Apocynum 
cannabinum, June 21, by Mr. Robertson has until now formed the 
basis for this species. A male taken at Hyannia Point, Massa- 
chusetts, July 4, 1904, by Mr. C. W. Johnson has been compared 
with the type by Mr. Robertson and found to be the same. The 
female here described was collected at Webster, New Hampshire, 
August 1, 1898, on Rhus by Mr. W. F. Fiske. The two last-men- 
tioned specimens are in the author’s collection. In all probability 
the species is a wide ranging, though uncommon one. 
SPECIMENS EXxAMINED—Massachusetts: Hyannis Point, 1; 
New Hampshire: Webster, I. 
Colletes lacustris Swenk. 
1906. Colletes lacustris Swenk, Entomological News, xvii, p. 257, 2 o 
(September, 1906) ; original description. 
9. Length 9 mm. Clypeus shining, long, and prominent, flattened but 
not sulcate, its punctures coarse but widely separated and not at all striate, 
the subapical transverse depression very deep. Supraclypeal area shining, 
coarsely punctured. Face roughened by excessively small cancellate punc- 
81 
