THE MOUNT DESERT REGION 441 



Hylaeus Fabricius 



H. CRESSONI (CklL). Eden, July 15. Look for the nests of 



some of this genus in stems. 

 H. ELLiPTicA Kirby. Bar Harbor ; Penikese, July 13-19. 

 H. MODESTUS Say. Common, June 17-July 30. 

 H. THASPii Robts. S. W. Harbor, July 11. 



Andrenidae 



Andrena Fabricius 



This genus burrows in bare ground. They sometimes are in 

 colonies. I have seen females, that appeared to be guarding 

 the opening against parasites, step aside to let another go in. 



A. ASTERis. Station F267, Sept. 5. 



A. BiPUNCTATA Cress. Station F240, May 11.. 



A. cARLiNi Cock. Station F241, May 11. 



A. CLARKELLA Kirby. Station F241, April 21. 



A. cocKERELLi Gracu. Bar Harbor; Eden, June 7-9. 



A. coRNi Robt. Station F236, May 11. 



A. cRATAEGi Rob. Sectiou 28, July 11. 



A. HiRTiciNCTA Prov. S. W. Harbor, Aug. 23. On flowers of 



goldenrod. 

 A. LATA Vier. Bar Harbor, June 8, 1921. Type locality. 

 A. MiLWAUKENsis Graeu. Bar Harbor; Echo Lake, June 8- 



July 12; Witch Hole on blackberry flowers. This species 



is frequently stylopized. 

 A. MIRANDA Smith. Eden, July 11. 

 A. NEBECULA Smith. Bar Harbor, Sept. 9-11. 

 A. PLACiDA Smith. Station F240, May 11. 

 A. SALicTARiA Rob. Statiou F240, May 11. 

 A. THASPii Graen. Echo Lake; N. E. Harbor (Minot), June 



18-July 8. Stylopized. 

 A. TUMiDA Vier. Echo Lake, July 12, 1918. Type locality. 

 A. viciNA Smith. Bar Harbor, June 8. On flowers of fruit 



trees. 



