June, 1838 ] CASEY : NORTH AMERICAN COLEOPTERA. 91 



Octotemnus Me Hie. 



This is a very pronounced and distinct genus, differing from En- 

 nearthron in the oval outline of the body, absence of male sexual char- 

 acters of the head and prothorax, and in tibial structure. The maxil- 

 lary palpi are slender and pointed, the antennal club well developed 

 and very loose, the joints being attached by very slender pedicels and 

 with the sensitive pores approximate at each side of the apex. The 

 prosternum is short and somewhat concave before the coxae, with the pro- 

 cess thin and laminate. There is no fovea on the first ventral segment 

 of the male, but the surface is feebly and approximately bi-impressed 

 near the base, the intervening area elevated and prolonged backward in 

 an isolated triangular point, a structure not suggested elsewhere in the 

 family. The surface is glabrous, but the elytra have a few widely dis- 

 persed erect setae. Our two species are very closely allied ; they may 

 be described as follows from the male : — 



Form more narrowly oval ; size larger, the basal abdominal process of the male 

 very acute at apex, pale testaceous, polished throughout ; head and eyes well 

 developed, the latter convex ; front broadly, evenly convex, very minutely, 

 sparsely punctate ; clypeal margin slightly thickened for a short distance from 

 ihe eyes ; prothorax but little wider than long, circularly rounded at apex, the 

 sides diverging slightly to the base ; angles all very broadly rounded ; base very 

 minutely margined ; punctures very minute, feeble and sparse ; elytra fully one- 

 half longer than wide, a little wider than the prothorax and nearly twice as loDg ; 

 sides feebly arcuate, the apex rather narrowly parabolic ; base not margined ; hu- 

 meral callus very small, feeble ; surface feebly rugulose, the punctures extremely 

 minute and sparse. Length 1.4-1.75 mm.; width 055-0.75 mm. Pacific 

 coast (from Vancouver to San Francisco) . denudatus, sp. nov. 



Form rather shorter and more broadly oval, polished, the pronotum more or less alu- 

 taceous, blackish to pale flavo- testaceous throughout ; head and prothorax nearly 

 as in denudatus, ihe elytra barely one-half longer than wide, distinctly wider 

 than the prothorax and barely twice as long, the surface nearly smooth, very mi- 

 nutely, sparsely punctate. Length 1. 35-1. 6 mm.; width 0.6-0.65 mm - 

 Rhode Island, New York and Pennsylvania Iae\ is, sp. nov. 



Both of these species are very common, and it is remarkable that 

 they have not been heretofore described. Perhaps the Cis pumicattis of 

 Mellie may be the same as Icevis, but that species, taken apparently near 

 New Orleans, is said to have the prothorax longer than wide and the 

 elytra only one- half longer than the prothorax, which language agrees 

 rigorously also with the figure and in no way suits either^of the above 

 species. 



