Coleopterological Notices. 343 



arcuate sides of the prothorax, sparser punctuation, smaller size, 

 relatively narrower and shorter elytra, much shorter metasternum, 

 and in the presence of an impressed median line on the pronotum ; 

 this line is very feeble and may sometimes be scarcely traceable. 

 There is no trace of an impunctate median line in either discors or 

 longipenne. 



Ell. debile n. sp. — Oblong-oval, moderately convex, piceous-black, the 

 legs and antenna? dark rufous ; integuments rather dull, the elytra more 

 shining. Head moderately narrowed from base to apex, the sides before the 

 eyes feebly arcuate ; median lobe at apex very slightly produced, broadly 

 truncate, the emarginations very small but distinct ; eyes moderate ; surface 

 finely, extremely densely punctate throughout ; antenna? slender. Prothorax 

 about three-fourths wider than long ; apex slightly narrower than the base, 

 evenly and strongly emarginate in circular arc, the angles right, not at all 

 rounded and anteriorly prominent ; base transverse, extremely feebly sinuate 

 at each side of the middle ; basal angles rather obtuse but not at all rounded ; 

 sides nearly evenly and moderately arcuate ; disk rather convex longitudi- 

 nally, with the feeblest trace of a fine, elevated, median line, finely, densely 

 punctate, the punctures scabrous and extremely densely crowded toward the 

 sides, very dense but distinctly separated toward the middle, not at all im- 

 pressed although very sparsely punctate in a small area opposite the scutellum. 

 Elytra nearly one-fourth wider than the prothorax and rather more than three 

 times as long, across the humeri a little wider than any portion of the disk 

 of the latter, the humeri broadly exposed and very narrowly rounded ; apex 

 obtusely rounded ; sides parallel and nearly straight ; disk with extremely 

 confused, approximate, unimpressed rows of somewhat coarse, subscabrous 

 and rather approximate punctures. Abdomen very finely and sparsely punc- 

 tate ; metasternum between coxa and groove nearly one-fourth longer than 

 the first ventral segment. Legs slender, the posterior tarsi much shorter than 

 the corresponding tibia?. Length 5.6 mm. ; width 2.5 mm. 



Arizona (Peach Springs). Mr. Wickham. 



This distinct species is allied to punctulatum and longipenne, 

 but is very much smaller ; from crassulum and sodalis it may be 

 readily known by its widely exposed humeri and more depressed 

 form. It is a connecting link between the larger species of this 

 section, with very long metasternum, and the small very convex 

 species with shorter metasternum. 



Ell. sodalis Horn.— Trans. Am. Phil. Soc, XIV, p. 268.— Oblong-oval, 

 robust, very convex, subalutaceous, the elytra polished, pale brownish-testa- 

 ceous throughout. Head rather small, moderately transverse, narrowed from 

 base to apex, the latter truncate, the median lobe extremely broad, very 

 slightly advanced, broadly rounded toward the emarginations which are dis- 



