ANDRENIDAE 435 



simplex Smith. "United States." (Pterandrena) 



solidaginis Robertson. Nebr. and Minn, to New England States, south to 

 Ga. On flowers of Aster, Boltonia, Gnapkalium, Polygonum, and 

 Solidago. (Pterandrena) 



sperryi (Cockerell). Calif. (Mojave Desert, San Joaquin Valley). Visiting 

 flowers of Oenothera. (Diandrena) 



spiraeana Robertson, Colo, and Minn, to New England States, south to Tenn. 

 and S, C. Visiting flowers of Aruncus, Azalea, Cryptotaenia, Her- 

 acleum, Hydrangea, Ptelea, and Rhus. (Trachandrena) 



*stagei Linsley and MacSwain. Wyo. (Sweetwater Co.). On flowers of Oen- 

 othera trichocalyx. (Onagrandrena) 

 Andrena (Onagrandrena) stagei Linsley and MacSwain, 1962. Pan-Pa- 

 cific Ent. 38: 52. 9. 



stictigastra Viereck. Remove from (? Onagrandrena). 



Taxonomy: Linsley and MacSwain, 1961. Pan-Pacific Ent. 37: 129. 



suavis Timberlake. Collects pollen of Ranunculus. (Ptilandrena) 



Biology: Linsley and MacSwain, 1959. Calif. Univ. Pubs. Ent. 16: 13-16, 

 plate 3, figs, a and b. 



*subchalybea chlorosoma Linsley and MacSwain. Calif. (Berkeley). Visiting 

 flowers of Ranunculus. (Diandrena) 

 Andrena (Diandrena) subchalybea chlorosoma Linsley and MacSwain, 

 1961. Pan-Pacific Ent. 37: 32. $, $. 



subchalybea subchalybea Viereck, changed status. (Diandrena) 



Andrena (Diandrena) subchalybea Viereck. Reduced to subsp. rank 

 (teste Linsley and MacSwain, 1961. Pan-Pacific Ent. 37: 32). 



subcommoda Cockerell. Syn. of crataegi Robertson. 



*thorpi Linsley and MacSwain. Nev. (Humboldt Co.). On flowers of Oenoth- 

 era deltoides. (Onagrandrena) 

 Andrena (Onagrandrena) thorpi Linsley and MacSwain, 1962. Pan-Pa- 

 cific Ent. 38: 51. 9. 



tridens Robertson. 111. and Mich, to New England States, south to Tenn. and 

 Ga. On flowers of Azalea, Dentaria, Hepatica, Hydrangea, Rhodo- 

 dendron, and Rhus. (Andrena) 



*unica Mitchell. N. Y. (Ithaca). (Trachandrena) 



Andrena (Trachandrena) unica Mitchell, 1960. N. C. Agr. Expt. Sta. 

 Tech. Bull. 141: 203, fig. 36. $. 



*uvulariae Mitchell. Md. (Beltsville). On flowers of Uvularia sessilif olia. 

 (? Simandrena) 

 Andrena (? Simandrena) uvulariae Mitchell, 1960. N. C. Agr. Expt. Sta. 

 Tech. Bull. 141: 245, fig. 54. $. 



*veriia Mitchell. Md., N. C, Ind., Miss. Visiting flowers of Prunus and 

 Salix. (? Mimandrena) 

 Andrena (? Mimandrena) verna Mitchell, 1960. N. C. Agr. Expt. Sta. 

 Tech. Bull. 141: 206, figs. 37, 38. $. 



♦vernalis Mitchell. Conn., N. Y., Ohio (Micrandrena) 



Andrena (Micrandrena) vernalis Mitchell, I960. N. C. Agr. Expt. Sta. 

 Tech. Bull. 141: 168, fig. 29. ?. 



*vespertina Linsley and MacSwain, Calif. (Kern Co.). Visiting flowers of 

 Oenothera. (Onagrandrena) 

 Andrena (Onagrandrena) vespertina Linsley and MacSwain, 1961. Pan- 

 Pacific Ent. 37 : 123. 9, $. 



vibumella Graenicher. Ga. Visiting many flowers. (Bythandrena) 



vicina Smith. Oreg. and B. C. to N.S., south to Ga. Visiting a number of 

 flowers, (Gymnandrena) 



