THE MOUNT DESERT REGION 50] 



Trypoxylon Latreille 



T. frigidum Smith. Common, July 17-Sept. 6. The species 

 of this genus vary in their nest building but provision them 

 with spiders. 



T. pennsylvanicum Sauss. Mt. Desert (Br.), June 21. 



Psen Latreille 



P. (mimesa) basirufus (Pack.). Echo Lake; S. W. Harbor: 



N. E. Harbor, July 6-18. 

 P. (mimesa) pauper (Pack.). Bar Harbor, Aug. 16. 



Stigmus Panzer 



S. americanus Pack. Bar Harbor; Echo Lake, June 15-17. 

 Bar Harbor; Echo Lake, June 15-17. They make their nest 

 in the pith of dry branches of sumac, provisioning it with 

 aphids. 



Pemphredon Latreille 



P. (pemphredon) angularis Fox. Bar Harbor and N. E. 



Harbor the first part of July. These also provision with 



aphids. They build in decaying wood. 

 P. (pemphredon) provancheri Ashm. Laboratory Aug. 25. 



Scarce. Use decaying wood and provision with aphids. 

 P. (cemonus) inornatus Say. Upper Hadlock Pond; Bar 



Harbor, June 10-21. 



Passaloecus Shuckard 



P. mandibulars (Crses.). Bar Harbor; S. W. Harbor, June 

 17-July 29. These use old galleries in wood in which they 

 put clay cells provisioned with aphids. 



Euplilis Risso 



E. (euplilis) clavipes (Linn.). Bar Harbor, July 8. A new- 

 record for Maine. 

 E. (corynopus) coarctata (Scop.). Mt. Desert, Aug. 6 

 ^ (Br.). 

 E. (corynopus) rufigaster (Pack.). Laboratory, Aug. 5. 



