Specific Characters in the Bee Genus Colletes 17 
SPECIMENS ExAmMINnep—District of Columbia: Washington, 1; 
Nebraska: Lincoln, 15; Glen, 1; Warbonnet Canyon, 6; Texas: 
Fedor, I. 
Colletes latitarsis Robertson. 
1891. Colletes latitarsis Robertson, Transactions of the American En-’ 
tomological Socicty, xviii, p. 60, 2 6 (April, 1891); original 
description. 
1904. Colletes willistoni Pierce, University of Nebraska Studies, iv, p. 
24, (April, 1904) ; recorded from Lincoln, Nebraska. 
1904. Colletes latitarsis Robertson, Canadian Entomologist, xxxvi, no. 
9, p. 275, 2, pp. 276-77, d¢ (September, 1904) ; in table of Llinois 
species. 
1906. Colletes latitarsis Robertson, Science, xxiii, p. 309 (February, 
1906) ; season, food plant. 
» @. Length 11-12 mm. Eyes slightly converging below. Clypeus bare, 
with coarse, strong, elongated punctures running into conspicuous parallel 
striae on the sides, the middle with a broad median longitudinal sulcus in 
which the punctures are less coarse-and not striate, but still strong and 
dense. Supraclypeal area punctured marginally, medially impunctate. Face 
above and on sides of clypeus with short, whitish pubescence. Vertex 
almost bare but fringed with a few black hairs, the space between ocelli 
and eyes and behind ocelli finely roughened with minute, weak punctures 
changing abruptly to large, close, deep punctures before ocelli. Cheeks 
finely and weakly punctured, with long, sparse white hairs, the occiput’ 
with shorter but denser white hairs. Malar space short, about one-sixth 
as long as broad. Antennae black with the flagellum bright testaceous 
beneath, joint 3 longer than 4, two-thirds as long as 4+5, the proportion 
being 4:3:3. All the joints are shorter than wide except first three, scape 
punctured. Prothoracic spine well formed and sharp. Mesothorax with 
close, strong punctures not sparser on the disk, the pubescence very short 
and sparse, mostly black on the disk, becoming white on the margins. 
Entire scutellum closely, coarsely punctured, with a posterior border of 
short black hairs followed behind by white ones. Postscutellum finely 
roughened, with very sparse, long, white hairs. Superior face of meta- 
thorax with a series of shining subquadrate pits, almost square medially, 
half as wide as long laterally. Enclosed space on posterior face shining, 
funnel-shaped, the neck twice as long as broad at base. Lateral faces of 
posterior plate dull, rather coarsely roughened, bearing abundant. long, 
white hairs. Mesopleura with large, close, deep punctures, and sparse, 
moderately long, white hair. Tegulae black. Wings hyaline, nervures 
deep rufo-testaceous, stigma blackish. Legs stout, with rather short whit- 
ish pubescence, somewhat longer on anterior femora, denser on posterior 
tibiae, the basal joint of hind tarsi unusually broad, its length only about 
59 
