400 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



(females), San Geronimo, Marin County, April 23, 1913 (J. C. 

 Bridwell) ; and 1 paratype (female), Russelman Park, Contra 

 Costa County, on Baeria, April 26, 1942 (E. G. Linsley). 



ANDRENA (ANDRENA) PALPALIS. new species 



This species is blue green in both sexes, with pubescence 

 mainly whitish, the abdomen fasciate, and the clypeus of the 

 male yellowish white. In most characters it agrees with typical 

 Andrena, except in the fasciate abdomen, the less corbiculate 

 propodeal floccus, and the white clypeus of the male. Other North 

 American species possessing similar characters are A. banksi 

 Malloch, A. angustella Cockerell, and A. quercina Cockerell, all 

 of which differ from palpalis in the black integument. This little 

 group, as exemplified by palpalis, differs from Dactylandrena 

 in the undeveloped malar space, fasciate abdomen, and compact 

 tibial scopa. A. quercina has a basal tooth on outer side of mandi- 

 ble, as in A. helvola (Linnaeus), the type of Andrena. 



Female. — Dark blue-green, the venter blackish. Antennae and 

 legs black, the claws ferruginous, the spurs testaceous. Tegulae 

 testaceous brown. Mandibles, except reddish tips, labrum and 

 clypeus, except the extreme upper margin, black. Pubescence dull 

 white, moderately long and dense, but not dense enough to con- 

 ceal surface of integument. Tergites 2 to 4 each with a narrow, 

 pure-white apical band. Disk of tergites 3 and 4 with short, erect 

 blackish hair, that of 2 with longer whitish hair. Apical fimbria 

 dark brown to fuscous. Hair of legs whitish, becoming partly 

 brownish on outer side of tibiae and tarsi. Scopa of hind tibiae 

 compact, broadly brown above and whitish on lower half, the 

 hairs simple. Hair on inner side of middle and hind tarsi pale 

 brown, that on front tarsi darker brown on both sides. Flocculus 

 of hind trochanters rather dense and whitish. Floccus of propo- 

 deum dense, but not much curled, the flanks below the floccus 

 with numerous long, scattered hairs. Process of labrum broadly 

 triangular, with a truncato-emarginate and somewhat nodose 

 apex. Facial foveae moderately broad, reaching level of antennae, 

 dark brown on upper half and whitish below, when viewed from 

 above. Clypeus large, convex, a little dullish but more shining in 

 middle, and with fine, moderately close punctures, which are finer 

 toward the margins and more or less sparser on middle of disk. 

 Sides of face dullish, indistinctly punctured. Frons dull, granular, 

 hardly striate, and impunctate. Mesoscutum dull, minutely granu- 

 lar-tessellate, and finely, rather closely punctured. Scutellum simi- 

 lar but shining. Basal area minutely tessellate like remainder of 

 propodeum. Abdomen shining, more distinctly tessellate at base 



