42 



BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



Genus Andrena sg. 

 A ndrena. 



Genus Stylops. 



Range. 



Season. 



Flowers. 



hartfordensls Cock- 



hartford ens is 



Wisconsin, Con- 



Mar. 27 to i Angelica, Symphoricarpos, 



erell. 



Pierce. 



necticut, Georgia. 



June 2. 



Taraxacum, Thaspium, 

 Vagnera, Viburnum. 



illinoiensis Robert- 



bruneri Pierce 



Washington, Ne- 



Apr. 2 to 



Amelanchier, Erigenia, Ge- 



son. 





braska, Wiscon- 

 sin, Illinois. 



May 7. 



ranium, Salix, Stellar ia. 



vicina Smith 



vicinx Pierce 



British Columbia, 



Apr. 15 to 



Caltha, Erythronium, Pru- 







Wash i n g t o n , 



June 18. 



nus, Ribcs, Rosa, Salix, 







Oregon, New 





Sanguinaria. 







Mexico, Wiscon- 











sin, Massachu- 











setts, Connecti- 











cut, New Hamp- 











shire, Canada. 







polemonii Robert- 



polemonii Pierce. . . 



Colorado, Illinois.. 



Apr. 20 to 



Polcmonium. 



son. 







Apr. 28. 





nivalis Smith 



graenichcri Pierce. 



Wisconsin, Hud- 



May 9 to 



Cornus, Geranium, Her- 







son Bay. 



June 27. 



acleum, Ribcs, Rubus, 

 Thaspium, Vagnera. 



corni Robertson 



cornii Pierce 



Illinois, Wiscon- 



May 27 to 



Angelica, Cornus, Rhus, 







sin. 



July 9. 



Rubus, Rosa, Sanicula, 

 Viburnum. 



multiplicata 



multiplicatx 



Wisconsin 



May 29 to 



Ceanothus, Cornus, Rhus, 



Cockerell. 



Pierce. 





July 30. 



Spiraea, Symphoricarpos, 

 Thaspium, Veronica. 



nubecula Smith .... 



nubcculx Pierce . . . 



Colorado, Ne- 

 braska, Illinois, 

 New York, New 

 Hampshire, 

 Nova Scotia. 



July 26 to Oct. 

 9. 



Aster, Solidago. 



sg. Pterandrena sol- 



swenki Pierce 



Nebraska, Illinois, 



Aug. 22 to Oct. 



Aster, Boltonia, Poligonum, 



idaginis Robert- 





Wisconsin, 



11. 



Solidago. 



son. 





Pennsylvania. 







crawfordi Viereek . 



crawfordi Pierce... 



Texas 



Apr. 26 to May 



Sitilias, Serinea, Lindheim- 









23. 



era, Engclmannia. 



sg- Opandrena bi- 



bipunclatx Pierce. . 



Nebraska, Texas, 



Apr. 5 to June 



A mclanchicr, Angelica, 



punctata Cresson. 





Wisconsin, Illi- 

 nois, Indiana, 

 New York, Ala- 

 bama. 



17. 



Claytonia, Cornus, Cra- 

 txgus, Erigenia, Prunus, 

 Salix, Staphylea, Stella- 

 ria, Symphoricarpos, Vi- 

 burnum, Zanthoxylum. 



cressonii Robertson. 



cressoni Pierce 



Vancouver, Brit- 



Apr. 5 to July 



Acer, Amelanchier, Clay- 







ish Columbia, 



5. 



tonia, Cornus, Geranium, 







Oregon, Wis- 





Heracleum, Hydrophyl- 







consin, Illinois, 





lum, Pastinaca, Pimpi- 







Maine. 





nella, Polytxnia, Prunus, 

 Salix, Sanicula, Stcllaria, 

 Vagnera, Zanthoxylum, 

 Zizia. 



robertsonii Dalle 



robertsoni Pierce. . . 



Illinois, Wisconsin, 



June 26 to July 



Ceanothus, Krigia, Rhus. 



Torre. 





Ohio. 



16. 





sg. Ptilandrena eri- 





Illinois, Wisconsin. 



Mar. 26 to May 

 14. 



Claytonia, Erigenia, Hydro- 

 phyllum. 



genix Robertson. 







sg. Trachandrcna 



claytonix Pierce. . . 



Illinois, Wisconsin, 



Mar. 21 to June 



Amelanchier, Antennaria, 



claytonix Robert- 





Georgia. 



4. 



Cercis, Claytonia, Herac- 



son. 









leum, Salix, Zizia. 



