THE CANADIAN ENTOMOLOGIST. 305 



• THE AMERICAN SPPXIES OF PRIOPHORUS. 



BY ALEX. 1). MACGILLIVRAY, ITHACA. N. Y. 



There have been described thus fiir tliree species of this genus from 

 the United States, two of them known only in the male sex, the third 

 known only in the female sex. x\ fourth species, known only in the female 

 sex, is described below. The types oi cequalis^ Nort., and simpliciconiis. 

 Cress., are in the collections of the American Entomological Society, and 

 I am indebted to Mr. J. Chester Bradley for examining these types and 

 furnishing me with the notes on which the descriptions given below are 

 based. The species can be separated by means of the following table : 



A. Frontal crest large and prominent, extending laterally to the eyes ; 

 the free part of Sc^ almost entirely 

 atrophied s'unplicicornis. Cress. 



AA. Frontal crest wanting or variously developed, never extending 

 laterally to the eyes ; the entire free part of Sc^ always distinct. 



B. Colour resinous, with notal portions black ; frontal crest 

 wanting ; transverse groove caudad of the ocelli 

 distinct acericaulis^ n. sp. 



BB. Colour black, with the apical half of thv^ legs paler ; frontal 

 crest distinct or subdistinct. 



C. Frontal crest broken by the antennal fovea ; sides of the 

 ocellar basin scarcely indicated ; transverse groove 



caudad of the ocelli distinct (Equalis, Nort. 



CC. Frontal crest entire, not broken by the antennal fovea ; 

 sides of the ocellar basin clearly distinguishable ; 

 transverse groove caudad of the ocelli scarcely indi- 

 cated solitaris, Dyar. 



Priophorics simpUcicoruis, Cress. — $ . Long, robust ; clypeus 

 transverse, somewhat elongate, deeply emarginate, pitted ; tentorial 

 invagination deep, extending as a groove along the lateral margin of the 

 antennae to about the middle of the front, where it is interrupted by the 

 frontal crest, continued as a short groove behind the lateral ocelli, transverse 

 groove indistinct, evident behind the anterior ocellus ; antennal fovea 

 triangular, flat, pointed in front ; antennal area almost linear ; frontal crest 

 large and prominent, extending to the eyes ; the sides of the ocellar basin 

 with a distinct rim ; antennte elongate, tapering to the apex, not enlarged 

 in the middle, segments stout and rough, of the same form as in solitaris ) 



September, 1906 



