Specific Characters in the Bee Genus Colletes 49 
shiny, sparsely punctured, and irregularly feebly reticulated. Tegulae shin- 
ing black. Wings slightly infuscated on apical half, basally subhyaline, 
nervures black, stigma dark brown. Legs black, their pubescence longest 
on posterior femora and tibiae, wholly grayish white except for the reddish 
tarsal tufts on inner apices. Anterior coxae with very small, short spines. 
Tibial spurs dusky testaceous, very finely and feebly pectinate. Claws 
ferruginous, medially toothed. Basal joint of hind tarsi slender, over 
three times as long as wide, middle joints. two and one-half times as long 
as wide. Abdomen stout, subconical, the first segment polished, its basal 
truncation impunctate, elsewhere with distinct, rather coarse, very well- 
separated punctures, becoming very fine and close on apical margins, fol- 
lowing segments less polished but still shiny, more finely and closely punc- 
tured, apex finely rugose. Apical margins of segments 1 and 2 constricted 
and depressed, of 3 and 4 merely depressed. Segments 1-5 have narrow 
white fasciae continued on the ventral fringes, but otherwise the abdomen 
is almost bare, having but short, scattered hairs at base and down sides 
of 1, the other segments with minute, scattered, pale hairs and some longer 
dark ones on last three segments. 
6. Length 9 mm. Differs from the 2 as follows: Pubescence some- 
what longer and rather denser, that on cheeks white, that on clyneus short 
but appressed and dense, concealing the surface; antennal joint 3 a little 
over one-third as long as 4, 2+3 distinctly shorter than 4, the proportion 
being 2.5:2.5:7; median antennal joints one and three-fourths times as 
long as wide; malar space one-fourth as long as wide; metathorax with 
posterior face scarcely punctured but very distinctly reticulated; punctures 
of mesopleura well separated; posterior tarsi more slender, the basal joint - 
five times as long as wide, the middle joints one and one-half times as 
long as wide, the apical tarsal joints brownish. 
Genitalia—Stipes notched, its apex long, curved, acuminate, heavily 
haired; sagittal rods sinuous, gradually tapering, their tips divergent; vol- 
sella moderate, seventh ventral plate somewhat T‘shaped, owing to the 
lateral prolongation of the lobes which have the tips recurved; internal 
costa densely haired, remainder of apical half of lobes with longer and 
sparser hair, basal half of lobes glabrous and heavily chitinized on basal 
margin, the chitinized area forming two prominent ovals connected inter- 
nally by upward prolongations. (Plate 3, figures 14 and 14a.) 
Type Locarity.—Carlinville, Illinois; types in collection of 
Mr. Charles Robertson. 
Colletes nudus is a Lower Austral species, ranging from New 
Jersey, Maryland, and.Virginia west to southern Illinois (Car- 
linville), northern Arkansas (Marion county), and east central 
Texas (Lee county). It is an aestival species, beginning to fly 
in Texas late in May, and in the Atlantic Coast states from mid- 
gl 
