6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



receiving first recurrent nervure well beyond middle. Third sub- 

 marginal very broad. Abdomen with extremely minute punctures. 

 Hair bands not well defined. Second segment in middle depressed 

 nearly one-half, but feebly. Apical plate narrow, broadened at end, 

 truncate. 



ANDRENA SPHECODINIFORMIS, new species. 



Platte Canyon, Colorado. (Baker, 5829.) 



Male. — Length, about 6£ mm. Head and thorax black; legs black, 

 tarsi obscure reddish; abdomen brownish ferruginous, the first dorsal 

 segment with more than the basal half black, the margin of the black 

 suffused ; second segment with oval black spot on each side; subapical 

 region broadly suffused with black. Pubescence rather dull white, 

 long on head and thorax, dense on clypeus, which is well punctured, 

 but shining between the punctures. Process of labrum broad, trun- 

 cate. Eyes somewhat converging below, so that the lower side of 

 the facial quadrangle is not greater than its length; vertex dullish; 

 cheeks normal; antennae black, the flagellum with the joints beyond 

 the first brownish beneath, the second to fourth light reddish, third 

 antennal joint about as long as fourth, fifth distinctly longer; malar 

 space short; meso thorax and scutellum dullish, with sparse very 

 feeble punctures; metathorax roughened, the triangular basal area 

 with strong long plicae. Tegulae reddish; wings hyaline, faintly red- 

 dish, strongly iridescent; stigma amber color, nervures fuscous. 

 Second submarginal cell very small, third submarginal not much elon- 

 gated. Abdomen shining, without distinct punctures. Second seg- 

 ment in middle depressed about one-half. Hair of abdomen rather 

 scanty, not forming bands. 



Type-Cut. No. 18123, U.S.N.M. 



b 5 . Abdomen not at all ferruginous. 



a 7 . Males. 



a 8 . Second abdominal segment in middle depressed over one-half; pubescence red. 



ANDRENA DAVISIANA, new species. 



Boulder, Colorado. May 8, 1907. (J. M. Davis.) 

 Male. — Length, 1\ mm. Black with fulvous pubescence, bright on 

 thorax above. Head broad. Process of labrum truncate. Clypeus 

 strongly and densely punctured. Antennae dark, third joint shorter 

 than fourth. Cheeks normal. Mesothorax and scutellum shining, 

 with irregular rather small punctures. Area of metathorax, with irreg- 

 ular rather weak ridges. Tegulae reddish. Wings reddish hyaline; 

 nervures and the very large stigma ferruginous, basal nervure falling 

 short of transverse median, second submarginal receiving first recur- 

 rent nervure a little beyond middle. Small joints of tarsi ferruginous. 

 Abdomen very finely punctured, not distinctly banded. Second 

 segment in middle depressed about three-fifths. Apical plate small. 



