356 Coleopterological Notices. 



circular arc, the angles right and not prominent ; base transverse, without 

 trace of lateral sinuations ; basal angles strongly obtuse, extremely narrowly 

 rounded ; sides strongly arcuate, usually a little straighter and more conver- 

 gent toward apex ; disk very slightly wider behind the middle than at base, 

 very finely, densely punctate, the punctures denser but not coarser laterally 

 where they are usually distinctly and longitudinally rugulose or coalescent ; 

 surface strongly convex longitudinally as well as transversely. Elytra sub- 

 equal in width to the prothorax, sometimes just visibly wider, not ([uite three 

 times as long ; sides parallel and very feebly arcuate ; apex parabolic, very 

 strongly rounded at the immediate apex ; disk with distant, unimpressed 

 series of small, rather feeble and approximate punctures which are less dis- 

 tinct toward the suture and confused toward apex, the intervals flat, more 

 finely, rather sparsely and confusedly punctate. Abdomen shining, finely, 

 rather sparsely j^unctate, generally finely, feebly, longitudinally rugulose ; 

 punctures rather coarse toward the sides. Legs moderate in length, the 

 femora somewhat robust ; posterior tarsi rather distinctly shorter than the 

 tibije. Length 5.4-7.0 mm. ; width 2.4-3.2 mm. 



Texas; New Mexico ; Arizona. 



The mctasternum is exactly equal in length to the first ventral 

 segment, the transverse groove very well developed and the body 

 totally apterous. 



This species is very abundantly diffused through the regions 

 indicated, but does not seem to extend to the westward of the 

 Colorado River. The series before me is very extensive, consist- 

 ing of forty-two specimens and indicates but slight variability; in 

 one abnormal specimen, however, the sides of the prothorax are 

 very broatfly and feebly .sinuate anteriorly. 



Fur some unaccountable reason convexus has been heretofore 

 confounded Avith the Californian obesus, a species distinct in all of 

 its characters and belonging to a different section of the genus. 

 My comparisons have been made from the original types of both. 



E. sll1)opaciIS Horn. — Trans. Am. Phil. Soc, XIV, p. 209. — Suboval, 

 wider behind, very convex, smooth but very dull, piceous-black ; under sur- 

 face, legs and antennse piceo-rufous. Head rather more than one-half as wide 

 as the base of the prothorax, rather short and transverse; sides parallel and 

 nearly straight in basal two-thirds, the eyes moderate, not at all prominent ; 

 apex broadly, very feebly sinuate, not emarginate laterally ; surface rather 

 finely but strongly, very densely punctate ; antennse long, slender, the eighth 

 joint nearly one-half longer than wide. Prothorax trapezoidal, three-fifths wider 

 than long ; apex about three-fourths as wide as the base, broadly, extremely 

 feebly sinuate, the angles right, narrowly but very distinctly rounded ; base 

 truncate and perfectly straight, the basal angles right and distinctly rounded ; 

 sides evenly convergent from base to apex and almost straight ; disk very 



