CALIFORNIA ACADEMY OF SCIENCES. 



CALODERMA u. gen. 



The species of this genus present a singularly homoge- 

 neous appearance, they being distinguished by their very 

 narrow elongate form, small heads with parallel sides, quad- 

 rate prothorax and long narrow parallel elytra; the abdom- 

 inal sculpture is also a distinguishing feature, the transverse 

 wavy lines of minute sub-asperate punctures being peculiar 

 to them, although having a tendency to reappear in the 

 genus Metaxyodonta. 



1 — C. rUffOSUm ^- sp. — Slender, moderately convex; sides parallel; color 

 throngliout piceous; pubescence extremely sparse and scarcely noticeable 

 upon the head and prothorax, very fine, extremely dense and sericeous on the 

 elytra and abdomen, pale ochreous in color and very conspicuous; under 

 surface and legs piceous-brown, the latter slightly paler, tarsi -pale brown; 

 antennae fuscous throughout. Head short and robust, scarcely longer than 

 wide; sides parallel, very feebly arcuate; base transversely truncate, basal 

 angles distinctly rounded; surface feebly and evenly convex, finel}'- and ex- 

 tremely densely punctate throughout, slightly more sparsely so between the 

 antennae; punctures round, shallow and sub-annular; eyes at much more 

 than their own length from the basal angles, moderately prominent; antennae 

 slender, nearly as long as the head and prothorax together, scarcely percep- 

 tibly incrassate; basal joint as long as the next two together, second very 

 slightly shorter and more robust than the third, tenth slightly longer than 

 wide; maxillary jDalpi piceous-black; labrum with four equal acute triangu- 

 lar teeth, sides broadly and rouudlj' lobed. Prothorax about as long as and 

 slightly wider than the head; sides parallel and feebly arcuate; base strongly 

 arcuate; apex broadly and much less strongly so; apical angles distinctly 

 rounded, basal very broadly so; apex with a very small feeble sinuation in 

 the middle; disk very slightly longer than wide, transversely, moderately 

 and evenlj'' convex, very minutely, rather strongly and evenly rugulose; 

 rugulae sinuous and interrujpted; having a very narrow and imperfect median 

 line toward base. Elytra at base very slightly wider than the pronotum; 

 sides parallel and feebly arcuate posteriorly; together broadly, triangularly 

 and feebly emarginate behind; disk, transversely and moderately convex, 

 one-third longer than wide, one-half longer than the prothorax, feebly im- 

 pressed along the suture, which is margined with a slightly elevated line, 

 extremely minutely, evenly and densely punctate; punctures asperate and 

 more sparse near the apices. Abdomen scarcely perceptibly paler toward tip, 

 transversely strigate with fine wavy lines of extremely minute asperities. 

 Legs moderate; anterior tarsi feebly dilated, first joint of the posterior as 

 long as the next two together. Length 3.7-4.2 mm. 



