American Caraboidea 157 



Besides the characters above mentioned, this species differs from 

 calida in the more slender mandibles, shorter antennae, the sixth 

 joint in the latter being more compressed and nearly three times 

 as long as wide in the male, and especially in the vestiture of the 

 fifth joint, which in calida is pubescent throughout, except very 

 narrowly along the axial line of the sides. The third anterior male 

 tarsal joint is twice as wide as long, while in calida it is very much 

 less transverse. 



Calosoma concreta n. sp. — Shorter, relatively broader and more 

 convex than calida, deep black in color throughout, shining but without 

 trace of metallic lustre; head distinctly more than half as wide as the 

 prothorax, with abruptly very prominent eyes, the surface finely, evenly 

 and sparsely punctate and somewhat rugulose throughout; epistoma 

 deeply impressed in the middle at apex, the lateral grooves deep; mandi- 

 bles short, subcircularly arcuate; antennae rather short, the fifth joint 

 broadly but not definitely glabrous at the sides; prothorax short, fully 

 twice as wide as long, evenly and circularly rounded and broadly declivo- 

 subreflexed, the beading of the edge fine and feeble; basal angles as in 

 calida; surface convex, rather shining, finely and sparsely punctulate, 

 becoming coarsely, densely punctate and rugulose peripherally; foveae 

 concave, deepest at some distance from the sides; elytra short, about a 

 third longer than wide, a fifth wider than the prothorax, parallel, with 

 feebly arcuate sides, obtusely ogival at apex; sculpture of the same 

 type as in calida but with the dark green ocellate fovea; very much 

 deeper, rather larger and more close-set, the longitudinally connecting 

 intervals relatively broader, more convex and without transverse lines, 

 the transverse lines of the three intermediate intervals feebler. Length 

 (cf ) 18.8 mm.; width 8.8 mm. A single male apparently from north of 

 Lake Superior. 



This species is strikingly different from calida in its shorter, 

 more compact and more convex form, much closer and deeper 

 elytral foveae, connected by wider and more convex smooth surfaces, 

 shorter mandibles, more abbreviated antennae, the outer joints 

 being very much shorter, and in several other structural features. 

 The fourth anterior male tarsal joint in calida is about as long as 

 wide, the apex much more produced internally than externally, 

 while in concreta it is nearly twice as wide as long, with the apex 

 subevenly emarginate, not noticeably more produced internally. 



The three following species belong to the same section as can- 

 cellata Esch. (cenescens and moniliala of LeConte), but in each case 

 are distinguished by some conspicuous special characters; they 

 were all taken by Mr. Nunenmacher: 



