196 MEMOIRS ON THE COLEOPTERA. 



dark testaceous in color, very much more evidently elongate, the parallel 

 sides less arcuate, the punctures a little coarser and not quite so nu- 

 merous; abdomen similarly duller in lustre than in densus and more 

 finely, less strongly, submuricately punctate; vestiture short but stiff, 

 yellowish. Length n.6 mm.; width 1.6 mm. Arizona (near Tucson). 



aridus n. sp. 



9 Body slender, more depressed, piceous-brown in color throughout, the 

 legs and antenna? paler and flavate as usual; head much narrower than 

 the prothorax, the eyes not prominent and at nearly half their length 

 from the base, the surface remotely, coarsely and irregularly punctate, 

 polished ; prothorax as long as wide, the converging sides nearly straight, 

 the surface polished, strongly but not very coarsely and somewhat loosely 

 though evenly punctate throughout, without smooth median line except 

 at base, and with the antero-lateral smooth spaces less developed than 

 usual; elytra but little wider though distinctly longer than the prothorax, 

 a little longer than wide, strongly punctured but only moderately closely; 

 abdomen narrower than the elytra, shining, somewhat strongly and 

 closely punctate; vestiture subflavate. Length 10.0-10.8 mm.; width 

 MS" 1 -5 mm - Texas (El Paso) diffidens n. sp. 



10 Form slender, parallel, moderately convex, strongly shining throughout 

 and not in the least dull in lustre, deep black; head a little narrower 

 than the prothorax, polished, with strong and remote punctures and others, 

 smaller, scattered sparsely over the interspaces; prothorax highly pol- 

 ished, obtrapezoidal, about as long as wide, the sides nearly straight; 

 punctures coarse, not very close-set, the usual narrow median line and 

 antero-lateral spots distinct; elytra not at all wider but apparently very 

 slightly longer than the prothorax, slightly longer than wide, very 

 coarsely, deeply and closely punctate, the narrow interspaces polished 

 and black; abdomen parallel, nearly as wide as the elytra, shining, 

 unusually finely and feebly, submuricately punctulate; vestiture sparse, 

 rather short and dark in color. Length (9) 10.0 mm.; width 1.2 mm. 

 Georgia and Florida opacus Lee. 



Form similarly parallel but a little broader and not so convex, deep black 

 and shining throughout, the legs and antennae pale; head nearly as in 

 opacus; prothorax relatively larger though similar in outline, the punc- 

 tures similarly disposed but smaller and more close-set, though equally 

 deep; elytra smaller, evidently narrower and shorter than the prothorax, 

 less evidently elongate than in the preceding, the punctures deep and 

 strong but not so coarse and more numerous; abdomen more strongly 

 punctulate and more closely and in more evident wavy transverse lines; 

 pubescence more abundant, paler and more distinct. Length (9) 10.3 

 mm.; width 1.33 mm. Iowa parvipennis n. sp. 



The name opacus, given by LeConte to the southern Atlantic 

 species, is one of the most singular misnomers that I can recall, and 

 must have been due to an inadvertent confusion of labels. Not 

 only is the species the most lustrous in our fauna, but the head and 

 pronotum, at least, are actually described by the author as being 



