1868.] 165 [Cresson. 



The following papers were read : — 



Descriptions of North American Bees. — No. 1. By E. T. 



Cresson. 



Family ANDRENID^. 



Genus Colletes Latr. 

 §. Specie^ from the United States and Canada. 



1. C. valida, n. sp. ?. Black; head and thorax deeply and 

 rather closely jiiinctured; clypeus long, subconvex, with a broad 

 shallow channel on its apical half, the space between their base and 

 the eyes unusually long; labrum polished, with a more or less deep 

 lateral impression; mandibles long, narrow, rufo-piceous at tip; head, 

 thorax and legs clothed with long ochraceous pubescence, that on 

 vertex and thorax above (which is tinged with fulvous) mixed with 

 black, that on cheeks, pleura and metathorax pale; metathorax rugu- 

 lose, the enclosed space at base shining, coarsely reticulated; wings 

 hyaline, nervures black; abdomen shining, closely and finely punc- 

 tured; basal segment clothed with a long, thin, pale ochraceous 

 pubescence; apical margin of all the segments above, except the last, 

 with a dense, even fliscia of pale ochraceous pubescence; apical seg- 

 ment rugose, clothed with black pubescence; apical margin of ventral 

 segments with a thin fringe of pale pubescence. Length six lines. 



The $ differs by having the pubescence much more dense. Length 



five lines. 



Hah. Massachusetts. Mr. Frank Stratton. (Coll. Am. Ent. Soc.) 

 This species is readily distinguished by the unusually long face, the 



space between the eyes and base of mandibles being twice the usual 



length. 



2. C. propinqua, n. sp. ? . Very similar to C. valida, but the 

 pubescence is paler and rather shorter; the clypeus is much shorter, 

 flat and coarsely sculptured; the laljrura has two slight, central de- 

 pressions; mandibles entirely black; the enclosed space at base of 

 metathorax is less coarsely reticulated ; the pubescence on the legs is 

 paler and somewhat silvery; wing nervures brown; otherwise like 

 C. valida. Length five and one-half lines. 



The 6 has the pubescence almost white, except on vertex and disk 

 of thorax, where it is slightly dusky; tips of tarsi and wing nervures 

 pale fulvous. Length five lines. 



