76 NORTH AMERICAN 



basal angle'; broadly rounded ; base distinctly broader than the apex, nearly 

 transverse, broadly sinuate between the basal angles ; apex rather strongly 

 euiarginate throughout, angles very narrowly rounded ; disk rather strongly 

 convex, broadly depressed toward the base and basal angles; median line 

 rather feebly impressed ; lateral border narrow, rellexed, edges thick ; apical 

 border narrow, becoming nearly obsolete in the middle, basal continuous 

 with that of the sides, only interrupted in a very short space in the middle ; 

 surface impiinctate, except a few excessively feeble punctures along the lateral 

 edges toward the base, and a very few near the basal angles. Elytra scarcely 

 visibly wider than the pronotum ; sides parallel and feebly arcuate for three- 

 fourths the length, then obtusely rounded behind, more acutely so at the 

 immediate apex ; disk convex ; striae strongly impressed ; intervals very 

 feebly convex, having numerous, large, very feeble, rounded impressions, 

 second, fifth, and seventh striae punctate, punctures small, rather distinct. 

 Legs rather slender ; middle tibiae strongly bent ; anterior tarsi distinctly 

 dilated, very coarsely dentate over the lower surface ; first joint of the poste- 

 rior tarsi slightly shorter than the next three together ; anterior coxae widely 

 separated, process nearly fiat, circularly rounded, large; middle coxae dis- 

 tinctly sei)arated. Metasternal episterna fully three-fourths longer than wide. 

 Length 8.r)-10.5 mm. 



Arizona, G. 



Described from t!ie male ; it appears to be common in Arizona, 

 and varies much in color, probably from immaturity. This species 

 is described as new after reading Di"- Horn's description of robnstns, 

 under which name I had recorded these specimens. In the descrip- 

 tion of rohiistiis, the prothorax is said to be distinctly narrower at 

 base than at apex, and the metasternal episterna arc said to be 

 scarcely lonjxer than wide; these measurements are so distinctly and 

 positively reversed in the present species that the two are necessarily 

 distinct, if all the cliaracters are correctly stated. 



SELEXOPIIOKUS Dej. 



S. perpolitllS n. sp. — Form somewhat robust and depressed. Color 

 above black, beneath piceous-black, abdomen wry slightly paler. Head 

 moderate in size, slightly longer than wide; eyes large, sligiitly ]>romincnt, 

 in most part visible from above, inner margin strongly sinuate; interocular 

 surface feebly convex, scarcely four times as wide as the eye, polished, 

 excessively feebly rugulose, covered sparsely behind with very fine feeble 

 eroded impressions ; supra-ocular setae rather distant from the eye; labrum 

 very large, nearly one-half wider than long, feebly and narrowly sinuate 

 anteriorly, anterior angles very broadly rounded, sides thence rather strongly 

 divergent to within a short distance of the base, where they become distinctly 

 convergent ; epistomal setae slightly distant from the anterior angles ; max- 

 illary palpi slender, third joint three-fourths as long as the fourth; second 

 joint of the labial i)alpi distinctly shorter than the third, which is a segment 



