American Caraboidea 171 



about half as wide as the prothorax, with rather prominent eyes; surface 

 smooth, with a very few feeble punctures near the apical angles; epistoma 

 deeply foveate at the middle of the apex, the lateral sulci deep and 

 rather narrow; mandibles moderate, smooth, only feebly arcuate ex- 

 ternally; antennae not quite as long as the head and prothorax, with 

 joints five to eleven finely, closely punctate and pubescent throughout; 

 prothorax three-fourths (cf ) to three-fifths (9 ) wider than long, parallel, 

 with evenly and circularly rounded, thickly beaded sides, the basal 

 angles broadly rounded but only very slightly produced behind; apical 

 and basal beading wholly wanting; median stria fine, not quite entire; 

 surface smooth, without trace of sculpture of any kind, evenly declivous 

 to the lateral beading and without refiexure near the sides; at a little 

 behind the middle there is a large foveiform puncture, apparently not 

 setigerous; scutellum very broadly and obtusely ogival; elytra oblong- 

 oval, a third longer than wide, a fourth (d^) to three-sevenths (9 ) wider 

 than the prothorax, the sides evenly arcuate, the humeri very broadly 

 rounded; surface almost completely devoid of any trace of longitudinal 

 series of punctures, except three rows of small distant and feebly im- 

 pressed non-metallic foveae and a submarginal series of fine asperulate 

 punctures; metasternum extremely short behind the coxae, the met- 

 episterna a third wider than long; anterior male tarsi moderately 

 dilated. Length (cf 9) 14.8-15.5 mm.; width 7.2-7.65 mm. Mexico 

 (Salazar, Mex.),— Wickham. 



The fact that these specimens were taken in the same locality 

 as that of Calosoma diminula Bates, the two forms having some 

 striking characters in common, I was led at first to hold Icevissimus 

 to be the same as diminutus, but on considering the description of 

 the latter, and the accompanying figure, more closely, I cannot find 

 much close agreement. In diminutus — whether a Calosoma or 

 Callisthenes — there is apparently a broad feeble reflexure of the 

 thoracic sides and the elytra have regular series of minute punctures, 

 and dorsal foveae which seem to be conspicuous; in l<wissimus the 

 latter are small, feeble, very inconspicuous impressed punctures, 

 and series of small punctures are but seldom at all traceable; 

 according to the figure the elytral humeri are much better marked 

 in diminutus, and Mr. Bates makes no allusion at all to the con- 

 spicuous puncture at each side of the pronotum in Icsvissimiis. 

 In this species the antennae, excepting the four polished basal joints, 

 are finely and densely punctate and pubescent throughout, and 

 without the irregularities noticeable in most of our Callisthenes; 

 this, and the very feebly produced basal thoracic angles, might be 

 thought to denote a closer agreement with Calosoma, but the body 

 seems to be wingless, the humeral angles being broadly rounded. 



