438 BIOLOGICAL SURVEY OF 



SCELIPHRON Klug 



S. CAEMENTARius Druiy. Common Mud-claiiber. Salisbury 

 Cove, July 24. These are the well-known mud-daubers 

 Avhich make nests in sheds, etc. and provision them with 

 spiders. 



Chalybion Dahlbom 



C. CAERULEUM Liiiii. Blue Mud-dauber. Bar Harbor, July 24. 

 It stores its nest with spiders, usually species of Epeira. 



PsEN Latreille 



P. BAsiRiTFUs Pack. Echo Lake ; S. W. Harbor ; N. E. Harbor, 



July 6-18. 

 P. 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 aphid s. 



Pemphredon Latreille 



P. ANGULARis Fox. Bar Harbor (Moore) ; N. E. Harbor, July 

 6 (Minot). These also provision with aphids and build in 

 decaying wood. 



P. coNCOLOR Prov. Laboratory, Aug. 25. Scarce. Use de- 

 caying wood for nests and aphids to provision them. 



Passaloecxjs Shuckard 



P. MANDiBULARis Crcss. Bar Harbor ; S. W. Harbor, June 17- 

 July 29. These use old galleries in wood in which they put 

 clay cells provisioned with aphids. 



Alyson Jurine 



A. opposiTUs Say. Eden ; Bar Harbor, July 19-Aug. 15. 



