REVTSTOX OF ELEODTTNT RLATSDELL. 459 



Superior pitden<h(l menihrawc atUiiniiio- the urKhllcMif Ihc dorsal 

 plate, finely and longitudinally ruguloso. 



Yentrolateral surfaces. — Body somewhat depressed, surface lines 

 straight when viewed longitudinally, moderately convex transversely, 

 smooth and shining; submarginal groove distinct beneath the not ex- 

 planate external margin of the dorsal plate. Internal margins of the 

 valves contiguous in basal four-fifths. Fissure very narrowly fusi- 

 form in apical fifth, membrane not visible. 



Habitat. — Arizona (Winslow, Barber and Schwarz; Tlolbrook, 

 H. F. AVickham) ; New Mexico (Coolidge, Wickham). 



Number of specimens studied, 7. 



Sexitypes (Cat. No. 12235) in the U. S. National Museum collection. 



Type-locality. — Winslow, Arizona. 



Salient type-characters. — Surface smooth, more or less shining and 

 obsoletely sculptured. Pronotum with the lateral margins thin and 

 moderately foliaceous, reflexed and concave. Flytral margins acute, 

 slightly reflexed and not quite attaining the apex; disc more or less 

 slightly concave. 



Diagnostic characters, — Conspicuous on account of its smooth in- 

 teguments and entire absence of the short setae that are so noticeable 

 in all of the other species. The body has a much greater dorso- 

 ventral thickness than any of the species before me. The sexes are 

 also less differentiated than in any other. It differs from contusnm, 

 elongatum^ and depressuyn in not having the marginal lines of the 

 elytra attain the apex. From planum by its moderately foliaceous 

 prothoracic margins, more or less concave elytral disc and in the 

 smooth and obsolete sculpturing. 



Glahr\iin appears more robust than any other form on account of 

 the unusual dorso-ventral thickness. 



General ohservations. — Mentum with the middle lobe slightly 

 smaller than usual, subtruncate anteriorly and feebly straightened 

 laterally, the sides oblique and converging to apex, the outline is 

 more semicircular than otherwise; surface smooth and somewhat 

 punctate laterally. 



The prosternum is quite prominent ventrally with the coxae, 

 arcuate antero-posteriorly and rather vertical posteriorly, not in the 

 least mucronate. 



Mesosternum arcuate and more or less vertically declivous, longi- 

 tudinally concave. 



The abdominal process is slightly transverse, in width scarcely as 

 long as the third abdominal segment; the post-coxal portion of the 

 first about equal to the second, the latter is twnce as long as the 

 fourth; the third is about one-half of its length shorter than the 

 second segment. 



The abdominal and metasternal salients are equal in width. 



