472 TRANSACTIONS OF THE 



spicuously punctured; elytra narrowed behind, striae punctured, 

 interstitial lines hardly convex ; pectus impunctured ; feet rufo- 

 testaceous ; postpectus and venter punctured. 



Very like suhmarginatus ; but the form of the thorax is very 

 diflferent. It was taken in Missouri by Mr. Nuttall. 



20. F. ADOXA. — Apterous, black, glabrous, impunctured; striae 

 impunctured; basal thoracic line not dilated. 



Length half an inch. [47] 



Carabus adoxus Melsh. Catal. 



Body black, glabrous, impunctured ; antennae robust, the 

 joints attenuated towards their bases, and with the palpi dark 

 rufous ; labrum truncate, dark rufous ; thorax large, impunctured, 

 gradually contracted behind, edge excurved at the hind angles, 

 dorsal line not attaining the base, basal lines strongly impressed, 

 cutting the base near the angles ; pectus impunctured ; post- 

 pectus punctured ; elytra, striae impunctured, interstitial lines 

 convex ; feet piceous ; abdomen piceous. 



Corresponds with M. Latreille's definition of the genus Pterosti- 

 chus of Bonelli. 



[Afterwards described by Dejean as Feronia tristis. — Leg.] 



21. F. GREGARIA. — Dark reddish-brown; limbs and margin of 

 the thorax paler, thorax at base equal to the base of the elytra. 



Carabus gregarius Melsh. Catal. 



Length two-fifths of an inch. 



Body dark chestnut, blackish each side beneath ; head dark 

 chestnut ; eyes and mandibles at tip black ; antennse and palpi 

 reddish-brown, the former half as long as the body ; thorax 

 rather longer than broad, impunctured, lateral margin distinct 

 and with the posterior margin paler, the latter rather broader 

 than at tip and equal to the base of the elytra, dorsal and pos- 

 terior lines indistinct, angles rounded ; elytra with impunctured 

 striae, margin paler and distantly punctured, without emargina 

 near the tip, but regularly rounded in that part ; epipleura dis- 

 tinctly canaliculate to near the tip ; feet color of the antennse, 

 long; venter blackish. 



Belongs to the genus Calathus of Bonelli and Latreille. [48] 



[Vol. IL 



