446 BIOLOGICAL SURVEY OF 



OsMiA Panzer. The Mason Bees 



These make a cement-like mass with sand, clay, vegetable 

 fragments and a fluid which cements it together. The species 

 vary in the kind of place that they select. Some use snail 

 shells. 



0. ALBivENTRis Crcss. Echo Lake, June 17; Station F251. 

 0. ATEivEisTTRis Crcss. Edcu on cord wood, July 3. Scarce. 

 0. BUCEPHALA Crcss. Little Round Pond under wet wood, 



July 21. Scarce. 

 0. DisTiNCTA Cress. 'Mt. Desert,' July 30, on flowers of Vicia 



(McAtee). 

 0. iNSPERGEisrs Lov. Pcnikcse, July 13. Station F251. 

 O. LiGNARiA Say. Bar Harbor, July 21. 

 0. MELAisroTRiCHA Lov. & Ckll. Bar Harbor, June 9; Echo 



Lake, June 17-July 12. 

 0. PUMiLA Cress. Bar Harbor, June 9. 

 0. siMiLLiMA Smith. Common, June 9-July 12. 



Stelis Panzer 



S. LATERALIS Ctcss. S. W. Hai'bor, July 20. Parasitic in the 

 nests of Alcidamia producta Cr. 



BOMBIDAE 



BoMBUS Latreille (Bremus Panzer). The Bumblebees 



B. AFFiNis Cres. Station F279, July 12. Scarce. 



B. BiMAcuLATus Crcss. *Mt. Desert,' July 30 (McAtee). 



B. BOREALis Nyl. S. de Mont Spring, July 3 (Salman). Scarce. 



B. FERviDus Fab. Nurseries, June 27 ; N. end of Eagle Lake, 



Sept. 26. 

 B. PERPLEXus Cress. Common, June 17-Sept. 30. 



