556 Coleoptcrolorjical Notices, V. 



smaller, the elytra subinflated at basal fourth, and distinctly wider than 

 the prothorax ; sides of the latter more convergent from the base. 



seminulum Er. 

 Presternum without strise, or with two Yery short stripe posteriorly ; form 

 oblong-oval, the elytra but slightly wider than the prothorax. 

 Subdepressed, the elytra not quite as long as wide....difl[icilis Horn. 

 Rather more convex and elongate, the elytra longer and more nar- 

 rowed at apex, fully as long as wide COmplexUS n. sp. 



I cannot distinguish estriatvs and affinis of LeCoute from aeqiialis, 

 in which species there is considerable sexual disparity, some speci- 

 mens — probably the males — being more narrowed posteriorly than 

 others. jEqualis is very different in general appearance from the 

 other species of the table. 



The species above identified as seminulum is common in the Mis- 

 sissippi Valley and North Carolina, but does not agi^e very well 

 with Marseul's figure, where the elytra are represented as only 

 slightly more than one-half longer than the prothorax ; in the speci- 

 mens before me the elytra are twice as long as the prothorax, and 

 there are several other notable differences, 



P. mailCIIS. — Narrowly oblong, moderately convex, black, polished, 

 strongly but sparsely punctate, more finely and closely on the pronotum. 

 Head even, finely punctate ; marginal stria fine but entire, following the sub- 

 lateral sinuations. Prothorax scarcely more than three- fourths wider than 

 long ; sides very feebly convergent and scarcely arcuate, becoming gradually 

 more arcuate and distinctly convergent toward apex ; marginal groove deep, 

 entire, unbroken along the apex ; punctures toward the sides scarcely at all 

 larger but sensibly closer ; base transverse. Elytra fully as long as wide, not 

 much more than twice as long as the prothorax and only just visibly wider ; 

 sides feebly arcuate ; apex three-fourths as wide as the base ; intlexed flanks 

 with a fine subcariniform entire stria, continuing unbroken around the apical 

 angles, forming an apical stria which is curved slightly forward at the suture 

 and then obliterated ; two oblique strise very feeble, the outer traceable far 

 behind the middle. Propygidhim finely, not densely punctate, the pygidium 

 very minutely, less distinctly but less sparsely so, in one of the sexes with a 

 few central vermiculate erosions. Prosternum with the lobe broadly rounded, 

 not margined and finely, sparsely punctate, flattened behind, without trace 

 of striae, the process rounded ; mesosternum not striate at apex, the emargina- 

 tion distinct ; lateral striae coarse ; surface with a broadly trapeziform stria 

 behind the emargination. Anterior tibiae broad, scmi-circularly rounded ex- 

 ternally, and with four small acute equal and equidistant teeth, the apex 

 broadly oblique and straight. Length 2.1-2.25 mm. ; width 1.0-1.15 mm. 



California (Humboldt Co.). 



A little larger than histriatus and with a broader prosternum. 

 The suture between the meso- and metasterna is singularly and 



