EEVISION OF ELEODIINI BLAISDELL. 49 



Type-locality as given by Thomas Say : " Region of the Arkansas 

 River and near the Rocky Mountains." 



Salient type-characte)'^. — Thorax subquadrate ; sides regularly arcu- 

 ate; apex very slightly emarginate; base nearly rectilinear, a little 

 arcuate each side near the angles, the latter obtuse. Elytra without 

 impressed striae; six regular series of punctures, which are more dis- 

 tant from each other than the length of their diameters; interstitial 

 lines with a few remote, acute, minute punctures; sides rounded and 

 irregularly punctured (Say). 



Diagnostic characters. — Easily recognized from the other members 

 of the subgenus by the smooth polished surface, the elytra being 

 sculptured with rather distantly placed series of coarse punctures; the 

 intervals are flat, with a single series of small distantly spaced 

 punctures. At times the punctures of both series may be equal in 

 size, and the species is then with some difficulty separated from ouiissa 

 (see p. T'2 and forma glabra); typically the intervals are flat, but 

 often become feebly convex and approach porcata (see p. 63 and 

 forma interstitialis) . The extreme heterotypical specimens are apt 

 to have a subasperate punctuation. 



Im7nunis LeConte appears to be a true synonym, probably more 

 closely related to var. soror. (See p. 50.) 



The mentum is moderate in size, triangulo-trapezoidal to parabolo- 

 triangular in outline; surface rather broadly foveate laterally with 

 a median longitudinal ridge, sometimes feebly sculptured, more or 

 less strongl}^ punctate and not noticeably bearded. 



The prosternum is variable; frequently continuously rounded be- 

 tween the coxse and behind, but not with the precoxal portion, not 

 mucronate ; often almost horizontally produced, at other times convex 

 between the coxse and with a more or less strongly developed mucro 

 behind. 



The mesosternum at times is quite vertically declivous, at others 

 oblique and more or less feebly concave. 



The metasternal process is as wide as the abdominal salient is long. 



The abdominal intercoxal process (male) is slightly transverse, 

 a little wider than the metasternal salient, and equal to the post- 

 coxal portion; the latter is also equal in length to the second seg- 

 ment; the third segment is one-third of its length longer than the 

 fourth. 



In the female the abdominal process is quadrate, and about a fifth 

 of its w^idth wdder than the metasternal salient, and equal in length 

 to the second segment ; the latter is about twice as long as the fourth ; 

 the third segment is equal in length to the post-coxal part of the 

 first. 



59780— Bull. 63—09 4 



