672 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



and allies of other authors. The group of Cerceris is considered 

 to be in a different family and can easily be separated by the 

 characters stated in the key to families. 



Key to Genera. 



Inner margins of eyes not emarginate; apex of radial cell 

 not reaching costa Aphilanthops p. 672 



Inner margins of eyes emarginate; apex of radial cell attain- 

 ing costa Philanthus p. 672 



Aphilanthops Patton. 



This genus is represented in the State by a single species. One 

 of the western species is known to use ants to provision its nest. 



A. frigidus (Smith). 



Clypeus with the apical margin quinquedentate. First joint 

 of the flagellum distinctly shorter than the second and third. 

 Markings yellow ; pubescence white. For an account of this 

 species, which provisions its nests with queen ants, see Wheeler, 

 Jour. Anim. Behavior, 19 13, vol. 3, pp. 374-387. 



Hartford, 30 July, 6 August, 1893. 



Philanthus Fabricius. 



The members of this genus are easily recognized by the large 

 subtransverse head, which is wider than the thorax. The body 

 is usually punctate, although in some cases sparsely so. The 

 markings are whitish or yellowish, with reddish legs in some 

 species. The wings are hyaline or subhyaline. The shape of the 

 eyes will easily separate this from Aphilanthops. Philanthus 

 has been divided by some writers, on venational characters, into 

 subgenera, but when species other than the genotypes are used 

 the variation is found to be so great that it is impossible to place 

 certain specimens under such subgenera satisfactorily. The 

 Nearctic species may be divided into groups by the primary 

 character of the following key. Treating these groups as sub- 

 genera, we would have Pseudanthophilus and Philanthus (=Epi- 

 philanthus and Anthophilus). 



As far as known these wasps prey on bees. In Europe P. 

 triangularis preys on the honey-bee, one insect being sufficient for 

 one cell. 



