278 G. H. HORN, M D. 



Synopsis of the Species of CORPHYRA, Say, of the United States. 

 BY GEORGE H. HORN, M. D. 



The species of this genus have been for a long time considered as 

 belonging to Pedilus, Fisch., the error having been made known by 

 Duval, Gen. Col. Europe, IV. p. 364, note. The essential differences 

 between Pedilus and CorjyJiyra being in the formation of the abdo- 

 men. The former genus according to Duval having but five segments 

 (in both sexes) of which the fourth is much the longer while the fifth 

 is merely a narrow band. Corpliyra has five segments in the female, 

 the last two being nearly of equal length and somewhat longer than 

 those which precede them; in the male there is seen a small sixth seg- 

 ment distinctly visible beyond the fifth, the latter being either trun- 

 cate or distinctly emarginate. The name Corphyra was proposed by 

 Say for species formerly placed by him in Anthicm and subsequently 

 separating them under the name Lagria (Bost. Jour. vol. I. p. 189) 

 remarking that the difierences " seem to justify, if not the formation 

 of a new genus, certainly a division of the present under the name 

 of Corpliyra." 



Several new species having presented themselves and the males of 

 several discovered not known to Leconte at the time of his Synopsis 

 (Proc. Acad. 1855, p. 272), the opportunity is thus made use of for 

 bringing before our students the means of recognising all our species 

 at present known. 



The males are readily known by the presence of the additional ab- 

 dominal segment as above stated and by the apices of the elytra hav- 

 ing either a yellow spot or a deep oblique impression and in several 

 species both together. In most of the species the apical region of the 

 male elytron is much less punctured and the space thus indicated is 

 more convex than the rest of the elytra. When the impression occurs 

 it is usually oblique, pointing towards the tip of the suture. 



Our species are as follows : 



I 

 Thorax black or dark blue. 



Elytra with oblique vitta and lateral margin pale vittata. 



Elytra entirely black or blue. 

 Legs black. 

 Apex of elytra %, with yellow space. 



Apical spot convex ; last two abdominal segments of % pale yellow; 

 head and thorax smooth; two basal joints of antennie 

 pale Newmani. 



