NORTH AMERICAN COLEOPTERA. 53 



longitudinal, inter-antennal elevation ; labrum four times as wide as long, 

 broadly emarginate anteriorly ; antennae about one-half as long as the 

 elytra, piceous-black, base infuscate, second joint nearly globular, joints 

 four to ten decreasing rapidly in length, the former twice as long as wide, 

 the latter quadrate ; finely pubescent toward the tip ; mentum longer than 

 wide, sides nearly parallel, transversely truncate anteriorly, surface convex. 

 Prothorax nearly two and one-half times as wide as long ; base broadly 

 arcuate, feebly sinuate in the middle and near the basal angles, apex nearly 

 transverse ; apical angles prominent, rounded, and callous, posterior very 

 slightly rounded ; sides moderately divergent posteriorly, arcuate, very feebly 

 sinuate near the apical callosities ; disk more or less broadly, feebly, and 

 irregularly impressed, minutely and distinctly rugulose, very minutely and 

 distinctly reticulated, rather sparsely and finely punctured ; margins nar- 

 rowly reflexed. Scutellum wider than long, triangular. Elytra across the 

 humeral protuberances distinctly wider than the pronotum ; sides divergent 

 and nearly straight for two-thirds the length ; disk broadly and obtusely 

 rounded behind, nearly five times as long as the pronotum, highly polished, 

 extremely feebly reticulated, finely and evenly punctulate, each elytron 

 having a very narrow black vitta along the interior edge attaining the tips, 

 a broader median vitta not attaining the tip, and a narrow marginal vitta 

 attaining the tip, remainder of the disk tlavate. Under surface of the abdo- 

 men mottled very confusedly with rufous, dark piceous-brown, and ochreous- 

 yellow ; legs piceous-brown throughout, femora confusedly clouded. Length 

 (3.5 mm. 



Arizona (Morrison). 



The differences between tlie present species and pnlchra are almost 

 generic, and lie principally in the structure of the palpi, mentum, and 

 prosternal intercoxal process. The latter in arizontB is dilated poste- 

 riorly and transversely truncate behind ; in pnlchra it is narrower and 

 gradually nan-owed posteriorly to the tip, which is acute ; in pennsyl- 

 vanica it is narrow, with the sides nearly parallel, and the surface is 

 very densely hirsute ; these differences may serve as a convenient 

 basis of classification. The only ornamentation of the pronotum in 

 arizonce consists of two small bhick spots rather distant and just in 

 advance of the middle. 



CH^TOCIVEMA. 



C> paiipercilla n. sp. — Form rather slender; glabrous. Color above 

 bronzed, beneath pale piceous-brown ; shining. Head nearly twice as 

 wide as long ; interocular surface evenly and rather feebly convex, finely, 

 deeply, and very distinctly granulate, also minutely, rather sparsely and 

 distinctly jiunctulate ; labrum nearly three times as wide as long, trans- 

 verse anteriorly; eyes broadly emarginate anteriorly, the upper margin of 

 the eyes, which are nearly straight, are produced anteriorly as two deep 

 straight convergent grooves, which connect with a very short transverse 

 groove between the bases of the antennae ; this transverse line is broadly 



4* 



