420 PROCEEDINGS OF THE NATIONAL MUSEUM. vul. xxxvi. 



HALICTUS MANILA Ashmead. 

 Ealictus manilcv Ashmead, Canadian Entomologist, XXXVI, p. 281. 



A very ordinary looking species, with basal hair-bands on abdomen ; 

 hind spur of hind tibia pectinate with four teeth, two long; third 

 submarginal cell short. 



Genus MICRANDRENA Ashniead. 



The group which Robertson ^ calls Opandrena is readily divisible 

 into two very distinct series, which seem to deserve subgeneric rank 

 under Andrena. These are as follows: 



Abdomen evidently punctured ; basal nervure practically meeting transverso- 

 medial ; apex of marginal cell rounded, not on costa ; end of first transverso- 

 cubital nervure not close to stigma. 



OiHtndrcna Robertson (type, crcssonii Robertson) 

 Abdomen impunctate or practically so; basal nervure falling some distance 

 sbort of transversomedial ; apex of marginal cell more i>oiuted, and on costu ; 

 end of first transversocubital nervure very near to the large stigma. 



Micrandrcna Ashmead (type, puci/iva Ashmead) 



Micrandrena also includes Andreud zizicc Robertson, ^1. pcrsonata 

 Robertson, and A. fragariuna Graenicher. Unfortunately there is an- 

 other iy^Q of Andrena^ that of .1. ■fiaoociypeata Smith, which though 

 jjlaced by Robertson in Opandrena., does not fit into 'either of the 

 groups defined above. It is near to Micrandrena., but the basal nerv- 

 ure almost meets the transversomedial, falling only a little short of it, 

 and the end of the first transversocubital is not close to the stigma. 

 A. fiaoociypeata is larger than Micrandrena., but ^1. zi2i(vformiii 

 Cockerell, from Virginia, falls Avitli it according to the characters 

 cited, and yet has the stature and appearance of a Micrandrena. 



Those who accept the whole series as one, following Robertson, must 

 use Ashmead's name Micrandrena., which was published in 181)9, while 

 Opandrena was not published until 1902. In Ashmead's description 

 of Micrandrena it appears that the facial foveiv are wanting; tliis is 

 not really the case, they are quite distinct and practically as in A. 

 zizim., of a seal-brown color, appearing white in certain lights. 



ANDRENA PACIFICA (Ashmead). 



Micrandrena pacifica Ashmead, Trans. Amer. Ent. Soc, XXVI, 1809, p. 81) 

 (no locality cited). — Cockerell, Psyche, X, 1003, p. 75 (California). 



Female. — Stature and appearance as in A. zizicv Robertson; differ- 

 ing from zizio) as follows: Anterior middle of clypeus very shiny, 

 with sparse punctures; flagellum dark, not ferruginous beneath; area 

 of metathorax rougher; wings yellowish, nervures clear ferruginous, 

 second submarginal cell broader; ajncal depression of second ab- 

 dominal seginent stronger and a little larger. 



Habitat. — ^Alameda County, California, June (collector not stated 

 on label.) 



"Trans. Amer. Eut. Soc, XXVIII, p. 193. 



