62 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Number of specimens studied, 200. 



Type destroyed. 



Type-locality. — Say received his specimens from the "Arid plains 

 of Arkansas and Missouri, in the vicinity of the Rocky Mts." 



Salient type-cJiaracters. — Body oblong-subovate, eh^tra with im- 

 pressed striic, which are slightly scabrous with minute elevated points 

 and impressed punctures; interstitial lines also punctured; sutural 

 margin obsoletely reddish brown (Say). 



Diagnostic characters. — This common species is to be recognized 

 from the other members of the group by its duller integuments and 

 striato-punctate elytra. In the typical form the elytra are feebly 

 scabrous at the central part of the disc and more strongly so at the 

 periphery; the strise are very obvious; in some specimens the stria? 

 are obsolete or feebly evident and the sculpturing slightly more 

 scabrous {forma punctata)^ while in some there is a more or less dis- 

 api^earance of the asperate punctuation so that they are quite smooth 

 and feebly shining and the striae are feebly marked {forma glahra) ; 

 this form appears to be rare, as I have only seen four samples, and 

 has no doubt heretofore been referred to qaadricollis. 



The small and slightly more robust form, reddish along the elytral 

 suture, is to be considered the typical form. Say's measurements are 

 one-half to three-fifths of an inch in length. This form in Colorado 

 and elsewhere has very convex elytral intervals and is here spoken 

 of as forma annectans.^ and is the homologue of porcata. 



The var. porcata. is a larger and nuicli more elongate form witli 

 strongly convex elytral intervals. (See p. <):').) 



The mentum is moderate in size and Aaries in form from triangulo- 

 trepezoidal to trapezoido-parabolic; the surface is moderately punc- 

 tate, seta? minute, convex at middle, and more or less foveate laterally. 



The prosternum is rather short before the coxa^ and ])rotuberant 

 ventrally with the cox?p, usually rounded antero-posteriorly between 

 the same; in the small forms not mucronate, but in a few specimens 

 there was a very slight mucro. In the larger individuals and in the 

 punctate form the mucro l)ecomes evident, but I have never seen it 

 well developed. 



The mesosternum is at times feebly convex, never strongly concave, 

 more or less obrHjue, but at times it is rather vertically declivous. 



The nietasternal process is about as wide as the abdominal salient 

 is long (male) or slightly narrower (female). 



The abdominal process is (juadrate (nuile) or slightly transverse 

 (female) and about a foui'th of its width wider than the metasternal 

 salient, equal in length to the post-coxal part of the first segment, the 

 latter being e(|ual in length to the second (male) ; the second is a 

 little longer in the female, where it is a half longer than the third; 



I 



