American Caraboidea 219 



Since my last study of this genus I have received a specimen of 

 confustis Lee, taken by Sherman at Marquette, Lake Superior; 

 it evidently belongs to the same group as the Alaskan species above 

 described, and so may possibly be identical with ingratus Dej. 

 It is much less elongate than heringi and very much larger than 

 nanulus, which last is the smallest species known from North 

 America. 



The following are four additional species of this genus: 



Calathus ventricosus n. sp. — Form elongate-ovoidal, moderately con- 

 vex, black, piceous beneath, the legs dark rufous; sides of the prothorax 

 diaphanously pale; upper surface moderately shining, the elytra opaque; 

 head somewhat elongate, four-sevenths as wide as the prothorax, with 

 moderately convex eyes; antennae ferruginous, nearly half as long as the 

 body; palpi pale, the last joint slender, barely longer than the third; 

 prothorax scarcely visibly wider than long, the sides feebly arcuate, 

 gradually a little more so and moderately converging anteriorly, the 

 apex deeply sinuate and two-thirds as wide as the base; basal angles 

 blunt at tip; impressions and lineate foveae scarcely traceable; sides 

 abruptly and strongly reflexed throughout the length, narrowly toward 

 apex, broadly but not deplanate basally; elytra somewhat over one- 

 half longer than wide, one-half wider than the prothorax, oblong-oval, 

 with distinctly arcuate sides, which as usual are not more arcuate basally, 

 obtusely ogival behind the middle; striai fine, somewhat deeper on the 

 declivity; intervals virtually flat; subscutellar puncture distinct; dorsal 

 punctures four; met-episterna subtriangular, but little longer than wide. 

 Length (9) 9.6 mm.; width 4.0 mm. Mississippi (Vicksburg). 



I could only secure a single example of this interesting species, 

 which can be compared only vf'ith. obesulus Csy., differing in its 

 smaller prothorax, more dilated elytra and less elongate antennae — 

 of the female in each case. 



Calathus peropacus n. sp. — Form very elongate-suboval and notably 

 depressed, piceous-black and moderately shining, the elytra deeper 

 black and densely opaque; under surface rufo-piceous, the legs dark 

 rufous; head slightly elongate, four-sevenths as wide as the prothorax, 

 the eyes moderate and rather prominent; palpi slender, piceous, the 

 last two joints equal in length and thickness; antennae blackish-piceous, 

 slender, less than half as long as the body, the pubescence of the fourth 

 joint beginning very abruptly at basal third; prothorax quadrate, as 

 long as wide or very nearly, widest at the middle, the feebly arcuate sides 

 less converging and straighter basally than apically; basal angles obtuse 

 and rounded; apex much narrower than the base, deeply sinuate, with 

 distinct and only slightly blunt angles; surface narrowly reflexed at the 

 sides, gradually becoming broadly deplanate and more opaque, and also a 

 little more reflexed at the edge, basally; impressions and foveae vestigial, 

 the short median stria evident; elytra four-fifths longer than wide. 



