Specific Characters in the Bee Genus Colletes 51 
posterior edge of the scutellum. Superior face of metathorax well defined 
and with its subrectangular pits unusually large and well formed, shining, 
scarcely wider medially, about twice as long as broad. Posterior face of 
metathorax shining, the lateral faces with sparse, long, white pubescence 
and coarsely, irregularly reticulated, forming a rugose surface, the en- 
closure funnel-shaped, its bowl ridged laterally and with a median long- 
itudinal carina, not so polished as the smooth neck, which is twice as long 
as wide at base. Mesopleura shining, very coarsely and closely punctured, 
the tubercles impunctate. Tegulae shining, dark brown to black. Wings 
hyaline, nervures very dark brown to blackish, stigma dark brown. Legs 
black, thinly clothed with whitish pubescence, rufous fringes on inner 
apices of tarsal joints. Claws medially toothed, ferruginous. Hind tibial 
spurs testaceous, minutely pectinate. Basal joint of hind tarsi three and 
one-half times as long as wide, median joints twice as long as wide. An- 
terior coxae with large, long, hairy spines. Abdomen shining, first seg- 
ment highly polished, basally impunctate but discally with small, well- 
separated, delicate punctures, becoming finer and dense on apical margin, 
segment 2 uniformly and more finely punctured, following segments in- 
distinctly punctured. Basal truncation with a ruff of long, pale hair reach- 
ing down the sides of segment 1, base of segment 2 depressed and with 
a white fascia broadly interrupted medially, supplementing lateral fasciae 
on apical margin .of 1, apical margins of 2-5 with complete broad, pure 
white fasciae, all the fasciae not dense and easily worn off, 3-6 with a few 
‘dark discal hairs. 
6. Length 9 mm. Differs from the @ as follows: Pubescence much 
paler and denser, that on clypeus long, dense, and gray, that on thorax 
long, erect, and covering the whole surface, wholly grayish white without 
black hairs; malar space one-third as long as broad; antennal joint 3 
shorter than 4 or 5, the proportion being 4:5:6; prothoracic spine smaller ; 
basal joint of hind tarsi about four and one-half times as long as wide; 
scutellum* sparsely punctured all over; abdomen not so highly polished 
and more distinctly punctured, the whole of the first segment with sparse, 
long, pale pubescence, loose fasciae on apices of segments 1-6, the apical 
margins depressed. 
Genitalia——Stipes notched, its apex long, acuminate, and with dense 
anical bristle tufts, the middle joint with several long setae extending in- 
ward over the sagittae; sagittal rods parallel except at tips which are 
abruptly divergent; volsella moderate; seventh ventral plate basally with 
conspicuous lateral bristle tufts, distad from which the lobes are hairy, 
densely so on the internal halves, and longitudinally striated. (Plate 3, 
figures 15 and 15a.) 
Type Locatity.—Big Horn mountains, Wyoming; types in 
collection of the author. 
