52 PROCEEDINGS OF THE ACADEMY OF 



Notes on the Species of CALOSOMA inhabiting the United States. 



BY JOHN L. LECONTE, M. D. 



The difference in the anterior tarsi of the males of certain species of Calo- 

 soma was first observed and made known by Schaum, (Ins. Deutschl. 1, 111,) 

 and a grouping of the species was proposed according as the 4th joint was 

 clothed beneath with a brush of hairs, like the preceding joints, or smooth and 

 naked, as in the majority of the species. An attentive study of the sexual cha- 

 racters of those species represented in my collection has shown me that the 

 number of divisions must be increased, in order that the species may be natu- 

 rally grouped. 



I would arrange our species as follows : 

 Anterior tarsi of the male with the 4th joint hairy beneath : 



Thorax with sides broadly fattened behind, (body elongate) I. 



Thorax narrowed behind, sides not flattened II. 



Anterior tarsi of the male with the 4th joint glabrous beneath : 



3d joint of anterior tarsi $ glabrous beneath ; thorax trisinuate behind... III. 

 3d joint of anterior tarsi $ hairy beneath : 



Thorax truncate behind , IV. 



Thorax emarginate behind : 



Body winged V. 



Body without wings VI. 



Group I. 



The species of this group are remarkable for the long narrow body; the 5th 

 and following joints of the antenna? are cylindrical and nearly equably pubes- 

 cent; the thorax is rounded at the sides, very slightly emarginate at the base, 

 which is not narrowed, but broad and flattened each side; the joints 1 3 of 

 the anterior tarsi of the male are clothed beneath with a brush of hair; the 

 4th joint is haiTy for a small space at the middle, and strongly spinous at the 

 sides. 



Our species are : 1. C. externum Say, (longipenneTte).); 2. C. mac rum 

 Lee, and 



3. C. protractum, elongatum, nigrum, subnitidum, thorace latitudine 

 duplo breviore, basi vix emarginato, subsinuato ; margine incrassato, basi et 

 lateribus punctato. his postice late modice reflexis, elytris thorace paulo lati- 

 oribus, parallelis, subtiliter seriatim punctatis. Long. -95 1-05. 



Arizona; Dr. Irwine, U. S. A. 



Group II. 



The species of this group have the 5th and following joints of the antennas 

 cylindrical, nearly equably hairy ; the thorax is comparatively small, much 

 narrowed behind, with the base slightly rounded ; the elytra are deeply striate 

 and ovate, being gradually widened from the base ; the joints 1 4 of the 

 anterior tarsi of the male are covered beneath with a dense brush of hair, the 

 first, however, being glabrous at the base; the 4th is very slightly spinous at 

 the sides. Our species are : 



4. C. scrutator Fabr. The middle tibire in the male are curved and 

 both they and the hind tibias are furnished with a dense brush of hairs on the 

 inner face near the tip. The species is found from Newfoundland to the point 

 of Lower California. 



5. C. W i 1 1 c o x i Lee. Middle tibia; of the male straight and not hairy. 



6. C. frigid um Kirby. Middle tibiae of the male slightly curved, and 

 somewhat, though not densely, hairy on the inner face. 



Group III. 

 The single species constituting this group has the outer joints of the antenna? 

 cylindrical and equably pubescent ; the thorax is narrowed behind and mode- 



[Feb. 



