BULLETIN 



OF THE 



BROOKLYN ENTOMOLOGICAL SOCIETY 



Vol. ^P^ %iL December, 1917 No. 5 



THE NORTH AMERICAN WASPS OF THE SUBGENUS 

 PEMPHREDON LATREILLE. 



By S. a. Rohwer, Specialist in Forest Hymenopfera, Bureau of Ento- 

 mology, U. S. Department of Agriculture. 



The North American species of Pemphredon as treated by 

 Fox, Trans. Amer. Ent. Soc, Vol. 19, 1892, p. 307, may be 

 divided into two well-defined subgenera. The first subgenus 

 has a recurrent vein in both of the cubital cells and is P^m/'/tr^c/ow 

 in the strict sense. The other subgenus has both recurrent veins 

 received by the first cubital cell and is Diphlehus Westwood. 

 Morice and Durant contend that the name Pemphredon should 

 fall as a synonym of Cemonus Jurine. According to the ruHngs 

 of the International Commission of Zoological Nomenclature, 

 the genus Pemphredon was founded in 1796 by Latreille and 

 antedates Cemonus. 



In this synopsis only the species of the subgenus Pemphredon 

 are tabulated. Pemphredon provancheri Ashmead and Pem- 

 phredon tinctipennis Cameron are not included. The unsatisfac- 

 tory description of provancheri makes it difificult to form a defi- 

 nite idea of this species and there is nothing in the collection 

 which agrees well enough to be considered as that species. Judg- 

 ing from the description, Pefnphredon tinctipennis Cameron is a 

 valid species and is different from any of the species in the col- 

 lections available. 



The nests of the species of the genus Pemphredon are as a rule 

 made either in brashy wood or in the old galleries of wood- 

 boring larvae and are provisioned with paralyzed flies. 



