394 CASEY 



sparse, becoming rather coarse but still well separated laterally, with 

 regular unimpressed series of I'ather coarse punctures suturally, 

 which become confused with the other punctures laterally ; surface 

 impressed near the sutural angles, which are very acute and slightly 

 mucronate ; under surface polished, with greenish metallic lustre, 

 the abdomen somewhat finely and sparsely but strongly punc- 

 tured medially. Length 13.0 mm.; width 5.5 mm. Nicaragua 

 ( Ometepe) , — Shimek *bicaviceps n . sp. 



Form nearly similar, less stout, glabrous, polished, black with bright 

 coppery -bronze lustre, greenish beneath, the legs dark piceo- 

 rufous ; head rather finely but deeply, very densely punctate 

 throughout, the occipital pits much shallower and triangular in 

 form, the epistomal lobe broadly parabolic ; prothorax nearly 

 similar, fully two-fifths wider than long, the apex nearly three- 

 fourths as wide as the base, with the moderately deflexed angles 

 very acute and anteriorly prominent, the sides feebly arcuate or 

 feebly subangulate before the middle, scarcely visibly sinuate 

 anteriorly, the basal angles right, not at all prominent, the punc- 

 tures only very moderately coarse and slightly separated laterally, 

 becoming fine medially, close-set anteriorly but sparse posteriorly, 

 with a partial impunctate line, the basal lobe strongly rounded, 

 not at all impressed ; scutellum similar ; elytra similar in form 

 and about a fourth wider than the prothorax, finely, sparsely and 

 confusedly punctate, more coarsely and densely but unevenly so 

 laterally, with the unimpressed series composed of only slightly 

 larger, widely spaced punctures and not at all conspicuous ; under 

 surface almost similar. Length 13.0 mm.; width 5.1 mm. 

 Panama (Natd) *alveolatum n. sp. 



14 — Form oval, somewhat inflated posteriorly, ver}' convex, sub- 

 opaque from density of sculpture, dark red-brown to blackish in 

 color, the legs not paler, devoid of metallic reflection, the pubes- 

 cence decumbent, yellowish-cinereous, short but dense ; head 

 trapezoidal, somewhat coarsely, very closely punctate; prothorax 

 two-fifths or more wider than long, very convex, the apex fully 

 three-fourths as wide as the base, with the angles greatly deflexed 

 though acute and slightly prominent, with the apex deeply and 

 evenly sinuate between them from an oblique anterior viewpoint, 

 the sides very feebly converging and but slightly arcuate in about 

 basal two-thirds, then rapidly rounding to the apex, the basal 

 angles abruptly and minutely prominent, the surface somewhat 

 coarsely, very closely punctate, extremely densely but not more 

 coarsely laterally, without impunctate line ; scutellum well devel- 

 oped, polished, rounded behind; elytra shorter than usual, but 

 little more than two and one-half times as long as the prothorax, 

 and, at the middle, a third wider, rapidly narrowed to the acute 

 apex, the sides strongly, evenly arcuate to the humeri, which are 

 not exposed, the callus very small and feeble, the surface smooth, 

 without distinct impressed lines, rather finely but deeply, very 



