102 J. L. LECONTE, M. D. 



In one specimen the posterior angle of the white dilatation represent- 

 ing the apical lunule is prolonged inwards, and slightly hooked. 



It is found promiscuously with G. torluosa, punctu/afa, and both 

 varieties of alxfommalis, on small sandy paths through meadows, near 

 Hogarth's landing, and near Spring Cove. They were seen in July. 

 August and September; in July ahdominalis was abundant, and hirti- 

 Inbrls scarce ; but later, these proportions were reversed. 



The position of this species is in the group with blanda, cuprascens, 

 etc., next to gratiosa. 



Notes on the RHYKODID.C of the I'nited Slates. 



BY JOHN L. LECONTE, M. D. 



On comparing specimens of Rhysodes and Clinidium from the Paci6c 

 States with those from the Atlantic district, I have recently observed 

 some characters which induce me to regard them as specifically different. 

 In pursuing my investigation, I have found certain sexual peculiarities 

 which seem to have been overlooked, and which will probably render 

 necessary a new study of the specie:^ heretofore described, and a more 

 accurate definition of their characters. 



These sexual differences are to be perceived in the anterior femora, 

 and in the hind tibiae; sometimes also in the middle tibiae. I have 

 endeavored to indicate the differences in the tibiae in the adjoined 

 wood cuts. 



RHYKODES Dalman. 

 §. — Prothorax with three entire deep grooves; elytra striate, not 

 costate ; middle and hind tibiae with one terminal spur. 



1. R. exaratus Serv., Enc. M^th. X., 308, 1825; (nee Dalman). West- 

 wood, ZodI. .lourn. V., tab. 46, p. 1. 



R.^aniericanus Lap., Silbermann's Rev. Ent. IV., 58, 1836. 



R. aratus Newm., Mag. Nat. Hist., 1838, II., 663; Germar. Zeitschr. II., 344. 



Atlantic States, New York to Georgia and westward to Missouri. 

 The prothorax is about one-half longer than wide, broadly rounded on 

 the sides, more rounded near the tip ; the furrows are very deep, and 

 the two outer ones are dilated behind; the disc is convex on the sides, 



