AMERICAN PHILOSOPHICAL SOCIETY. 449 



1. P. DEPRESSUS black, glabrous; thorax and elytra margined 

 with purple ; elytra perfectly smooth. 



Length eleven-tenths of an inch. 



Carabus depressus Melsh. Catal. 



Scarites depressus, thorax subquadrate, black ; elytra glabrous. 

 Fabr. Syst. Eleut., p. 123. 



Scarites depressus, antennae black, ob scure at tip ; head with two 

 impressed lines before ; thorax with a longitudinal impressed line ; 

 borders sometimes black-blue ; tarsi black brown. Oliv. 3, No. 36, 

 p. 5, t. 2, f. 15. 



Body glabrous, black, impunctured ; head transverse quadrate, 

 with two indented longitudinal lines more than half its length ; 

 antennse black-brownish at tip ; first joint black ; lab rum unequal ; 

 mandibles as long as the head, strongly dentate in the middle ; 

 tooth in the left one double ; thorax with an impressed line and 

 two indentations near the base ; exterior margin purple ; excurved 

 near the base ; elytra glabrous, perfectly smooth ; outer margin 

 purple, with a line of elevated granules ; tarsi black-brown. 



Var. a. Less dilated j margins blue ; elytra smooth, with a 

 slight appearance of lines ; sternum striated at tip. From the 

 Missouri. 



Cabinet of Nuttall. 



This fine large insect is of frequent occurrence in the United 

 States beneath old logs, stones, &c., and is very probably the same 

 as the depressus of Cayenne ; to which country authors have 

 referred this species. 



[Var. a is a distinct species, afterwards described by me as P. 

 elongatus. — Lec] 



2. P. SUBSULCATUS. — Black, glabrous ; thorax'and elytra mar- 

 gined with bluish purple ; elytra with obsolete lines. 



Length four-fifths of an inch. 



Body black, impunctured; [20] head impressed, frontal lines 

 profound ; antennae with ferruginous hairs toward the tip ; thorax 

 margined with blue-purple, slightly contracted behind ; edge near 

 the posterior angles slightly excurved ; dorsal and basal lines very 

 distinct; elytra with broad shallow sulcations ; with (in some parts) 

 obsolete rudiments of punctures; interstitial lines slightly elevated, 



1823.] 29 



