American Caraboidea i6i 



Calosoma semicuprea n. sp. — Form rather convex, more ventricose 

 than in the preceding, rather shining black, the anterior parts without 

 trace of metallic lustre, the elytra bright cupreous, with bright greenish 

 or cupreous foveae; under surface and legs deep black; head fully three- 

 fifths as wide as the prothorax, with very prominent eyes; surface 

 sparsely and irregularly punctate basally, rugose toward the eyes, the 

 latter with prominent superciliary ridge, and smooth medially, rugose 

 laterally toward apex; epistoma nearly smooth, feebly impressed at the 

 middle of the apex, the lateral excavations deep, nearly smooth; mandibles 

 subcircularly rounded externally; antennae nearly as in tepida; pro- 

 thorax four-fifths wider than long, widest barely before the middle, with 

 evenly rounded sides, which are rather broadly refiexed, strongly so 

 basally, the angles rounded, feebly produced; surface finely vermiculato- 

 punctulate, coarsely rugose at base and in the moderate concave foveae, 

 the beading at base and apex somewhat poorly defined; elytra two- 

 fifths longer than wide, one-half wider than the prothorax, feebly dilated 

 behind, with broadly arcuate and well reflexed sides, the edge basally 

 with four or five distinct serrules; surface with sculpture nearly as in 

 tepida, except that the metallic foveae are very much larger and very 

 conspicuous; anterior male tarsi of the tepida type. Length (cf ) 17.0 

 mm.; width 7.8 mm. A single specimen without indication of locality, 

 but probably from the northern Rocky Mountain region. 



This species is altogether distinct from tepida in coloration, in 

 the smaller anterior parts, sculpture of the head and epistoma 

 and especially in the very much larger and more brilliant metallic 

 foveae of the elytra; the dimensions of tepida are 20.0-21.0 by 

 9.0—9.8 mm. 



The following is a remarkably distinct species, larger and very 

 much stouter than semicuprea and with relatively larger head and 

 more elongate mandibles: 



Calosoma cogitans n. sp. — Stout, convex, moderately shining, deep 

 black, the elytra subcupreous in the deep impressed anastomosing lines 

 and with greenish-cupreous foveae, which are almost as conspicuous as 

 in calida; under surface deep shining black; head two-thirds as wide as 

 the prothorax, with very prominent eyes; surface deeply and rather 

 coarsely, closely and irregularly punctate and subrugulose; epistoma 

 deeply impressed in median fourth at apex, the lateral excavations deep; 

 mandibles three-fourths as long as the width across the eyes, rather 

 narrow, circularly rounded externally and closely sculptured; antennae 

 two-fifths as long as the body; prothorax very nearly twice as wide as 

 long, widest at the middle, the sides thence arcuate anteriorly and 

 oblique and nearly straight posteriorly, the angles strongly rounded and 

 distinctly projecting behind; surface deeply and closely punctate, more 

 coarsely and rugosely so peripherally; side margins sharply reflexed, 

 more broadly toward base, the foveae large and rather shallow; median 

 line fine, entire; apical beading thick, the basal obsolete; elytra oblong, 

 T. L. Casey, Mem. Col. IX, Jan. 1920. 



