THE MOUNT DESERT REGION 499 



Sphex Linnaeus 



One of the most interesting Genera of insects, some of 

 which use a pebble to pound down the soil on their burrows, 

 which they provision with caterpillars. 

 S. arvensis Dahlb. Common, June 11-Aug. 23. All of the 



species in this genus build in bare ground and provision with 



spiders. They are one of our most interesting groups. 

 S. aureonotatus (Cam.). Pernald's Point on Solid ago Aug. 



(Fernald). 

 S. nigricans (Dahlb.). Several flying low over grass, Peni- 



kese, July 21. 

 S. procerus (Dahlb.). Conner's Point on Solidago Aug. 



(Fernald). 

 S. sp. Mating pair. Middle Road, July. 



SCELIPHRON Klug 



S. caementarium Drury. Black and Yellow Mud-dauber. 

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

 daubers which make nests in sheds, etc., and provision them 

 with spiders. 



Chalybion Dahlbom 



C. californicum (saussure). Blue Mud-dauber. Bar Harbor, 

 July 24. It stores its nest with spiders, usually species of 

 Epeira. 



Alysson Panzer 



A. oppositus Say. Eden ; Bar Harbor, July 19-Aug. 5. 



Nysson Latreille 



N. lateralis Pack. Eden, July 23-25. 



Argogorytes Ashmead 



A. (archarpactus) nigrifrons (Smith). Bar Harbor. One 

 taken July 28, '36. 



