I 



Genus Colletes/rom New Mexico. 43 



long dull white hairs. Cljpeus shining, with sparse but 

 very distinct punctures. Labrum with a median elevation. 

 Vertex closely and strongly punctured. Space between eyes 

 and base of mandibles longer than breadth of latter, striated. 

 Mandibles rufous at extreme tips, which are blunt ; notch 

 deep and not far from end. Second and third joints of 

 maxillary palpi conspicuously shorter than first or fourth. 

 Flagellum wdiolly dark, its first joint about two thirds length 

 of second. Mesothorax shining, with large, rather sparse 

 punctures ; hind part of scutellum densely punctured ; post- 

 scutellum with fine longitudinal ridges, crossed by finer ones, 

 producing a curious cancellate appearance. Base of raeta- 

 thorax with a series of large elongated pits, separated by 

 sharp keels, the whole bounded behind by a distinct but 

 irregular ridge. Lower part of triangle wnth a shining de- 

 pression. Lateral faces of truncation shining, with irregular 

 shallow punctures. Articulating base surrounded above by 

 a smooth area, with radiating keels. TeguUe shining dark 

 brown, with very hairy margins. Wings perfectly hyaline, 

 nervures and stigma piceous, stigma very small. Legs black, 

 with long dull white hairs. Abdomen shining, strongly and 

 rather closely punctured ; first segment with long greyish- 

 white hairs; apical margins of segments 1 to 5 with bands of 

 white pubescence, wdiich are continued but very narrowly on 

 venter. Pubescence of extreme apex subfuscous. No black 

 hairs on dorsum of hindmost segments. 



Hob. Euidoso Creek, N. M., 6400 feet, July 8, on a small- 

 flowered Asclepias [E. 0. Wooton). 



A pollen-mass of the Asclepias is adherent to one of the 

 hind tarsi. Near to C. compactay Cr., <S , but that has dark 

 hairs on thorax and has not the strong series of pits at base 

 of metathorax. 



{b) Smaller ; tips of mandibles sharper ; punctuation of first abdominal 

 segment feebler and more sparse. 



Colletes dalecBj sp. n. 



<S . About 7 millim. long. 



Black, with abundant long wdiite pubescence, duller on 

 dorsum of thorax, but nowhere tinged with ochreous. Eyes 

 very prominent. Face densely covered with silky white 

 hair. Clypeus quite closely punctured, especially down the 

 middle. Labrum with a conspicuous central pit. Mandibles 

 rufous at tips. Space between mandibles and eye coarsely 

 striated, a little longer than broad. Sides of vertex densely 



