6o CASEY 



tuting a typical example of divergence due to local environment 

 in what may possibly be a comparatively recently evolutionized 

 type. The genus is well represented in almost every collection 

 and nothing further in way of description is called for at pres- 

 ent, except to draw attention to the form of the antennae as a 

 generic character hitherto overlooked. The body is smaller, 

 more oval and much less convex than in the preceding genus 

 and the basal joint of the anterior tarsi is longer, being almost as 

 long as the next three combined ; the outer apical angle of the 

 anterior tibiae is not so strongly everted but is much more 

 acute at tip ; the scutellum is similarly obsolete. The specific 

 or subspecific modifications known to me may be outlined as 

 follows : — 



Body moderately convex, stout, very obtusely rounded behind, with a 

 short obtuse sutural projection 2 



Body narrower, more depressed, the sides more gradually, arcuately 

 converging behind to the subacute apex 7 



2 — Upper surface of the body only partially opaque, the elevations of 



the elytra rather strongly shining 3 



Upper surface opaque throughout, the elevations of the elytra at most 

 alutaceous , 6 



3 — The irregular anastomosing depressions forming broad lines be- 



tween the narrower, feebly elevated and iri'egular subelevated 

 lines of the elytra, deep and better defined by the small asperulate 

 and minutely setigerous punctures along their anterior margins. .4 

 The anastomosing depressions very shallow, small in size and but little 

 less shining than the remainder of the surface, the entire upper 

 surface more shining than in any other species 5 



4 — Form oblong-suboval, convex, deep black, the head dull and dis- 



tinctly micro-reticulate, the pronotum more feebly and less dull, 

 the former finely but distinctly, not densely punctate, the latter 

 very minutely sparsely so throughout and only a little more dis- 

 tinctly or less sparsely laterally, the apex circularly emarginate 

 and evidently more than half as wide as the base, the sides broadly, 

 evenly rounded, the surface broadly explanate toward base, nar- 

 rowly so anteriorly, the marginal bead fine and almost completely 

 obsolete, the base broadly bisinuate and about two and a fourth 

 times as wide as the median length ; elytra but little longer than 

 wide, feebly inflated, the broadly arcuate sides becoming rapidly 

 converging and more arcuate in apical two-fifths, the apex very 

 obtusely ogival, the reticuliform erosions deep and opaque, very 

 confluent and irregular, the punctures on their anterior edges fine 

 and only moderately distinct, feebly asperate, the six discal ridges 

 on each elytron subequal and rather narrow, irregular; prosternum 



