ioo MEMOIRS ON THE COLEOPTERA 



feebly aenescent anteriorly, the elytra dark piceous, with very nubi- 

 lous paler markings at the base of each and toward the sides near 

 basal and apical third; under surface black, the abdomen rufous pos- 

 teriorly; legs and epipleura dark rufous; head fully three-fourths as 

 wide as the prothorax and wider than an elytron, the sulci very 

 moderate; antenna? notably slender, piceous-black, obscurely rufous 

 basally, with the medial joints not quite three times as long as wide; 

 prothorax about as wide at base as at apex, the sides broadly and 

 very evenly arcuate almost throughout, about straight at the min- 

 utely prominent basal angles, the anterior bluntly rounded, the 

 margins rather broadly reflexed; impressions subobsolete, the stria 

 short and fine; foveae deeply but not abruptly impressed, linear, the 

 carina strong, longer, more than a fourth the total length; elytra 

 nearly three-fifths longer than wide, two-fifths wider than the pro- 

 thorax, gradually ogival behind, the striae entire, very fine, unim- 

 pressed, very finely and closely punctate; third interval not notably 

 wider, the foveae small, before basal and near apical third. Length 

 (9 ) 4-7 mm.; width 1.6 mm. California (San Diego), cernens n. sp. 



Form nearly similar but very much smaller in size, rather convex, the 

 coloration and lustre almost similar, the elytra piceous-black, with 

 almost similar nubilous markings; head almost as in cernens, but 

 not quite so large, barely as wide as an elytron; antennae slender, 

 blackish, obscurely rufous basally, the medial joints between two 

 and three times as long as wide; prothorax shorter, fully one-half 

 wider than long, widest at apical two-fifths, the sides rather strongly 

 rounded, less so basally, becoming just visibly sinuate at the angles, 

 which are right and sharp; margins well reflexed; impressions rather 

 distinct, the abbreviated median stria well impressed; foveae mod- 

 erate, impressed, linear at the bottom, the carina distinct; elytra 

 fully one-half longer than wide, two-fifths wider than the prothorax, 

 very gradually strongly rounded behind and parallel, with distinctly 

 arcuate sides; striae entire, not very fine and, toward the suture, 

 somewhat deeply impressed, the punctures basally rather strong, 

 becoming rapidly fine and scarcely traceable behind the middle; 

 foveae strong, generally before basal and near apical third, the third 

 interval somewhat wider than the others, all the intervals toward 

 the suture convex. Length (cf 9 ?) 3-4-3-6 mm.; width 1.25-1.3 

 mm. Arizona (probably southern) latebricola n. sp. 



24 Prothorax larger and broader, about three-fourths as wide as the 

 elytra or more. Body oblong-oval, rather convex, shining, the head 

 and sides of the pronotum more or less alutaceous, black, with faint 

 aeneous lustre, the elytra piceous, with faint paler markings somewhat 

 as in extricatum, this being the general type form of markings in 

 this subsection; legs and epipleura piceo-rufous; head rather small, 

 two-thirds as wide as the prothorax and narrower than an elytron; 

 antennae blackish, obscurely rufous basally, rather thick, the medial 

 joints not quite twice as long as wide; prothorax one-half to three- 

 fifths wider than long, the sides rounded evenly to just before the 

 basal angles, where they become feebly sinuate; impressions very 

 faint, the stria distinct, not quite entire; foveae deep, short, the carina 



