366 Coleopterological Notices. 



nent and acute apical angles of the protborax, and in the very 

 minute vestiture. 1 



CHIEOMETOPOIV Horn. 



This genus is composed of two distinct sectional groups; the 

 metasternal groove is very distinctly impressed throughout and 

 the wings well developed. The species may be distinguished as 

 follows : — 



Last joint of the antennae about as long as the two preceding together I 



Thoracic angles acute and prominent ; metasternum between coxa and groove 



about one-half longer than the first ventral segment pallidum 



Thoracic angles not prominent ; metasternum subequal in length to the first 



ventral segment atoliorilie 



Last antennal joint shorter II 



Castaneous, shining; form oblong-oval helopioides 



I have before me two specimens of a species which is almost 

 undoubtedly distinct from helopioides, the apical angles of the 



1 The following is not described among the numerous Mexican species pub- 

 lished by Mr. Champion ; it belongs to the section having the middle lobe of 

 the epistoma produced and rounded, and the pronotum similar in the sexes. 



E. gracilis n. sp. — Fusiform, slender and elongate, moderately, evenly 

 convex, bright seneous, polished ; pubescence very short and coarse, sparse 

 and very inconspicuous. Head rather finely, deeply, not very densely punc- 

 tate, very sparsely so in the middle ; supra-orbital fold obsolete above the eye, 

 but feeble and slightly arcuate before it ; antenna? long. Prothorax but slightly 

 more than one-fourth wider than long, the apex distinctly narrower than the 

 base, subtruncate between the very acute and greatly advanced and prominent 

 angles ; base strongly lobed in the middle, the basal angles acute and promi- 

 nent ; -sides very feebly arcuate, sinuate near the basal and apical angles ; 

 disk with an elongate-oval, foveolate impression just before the scutellum, 

 also impressed laterally along the basal margin, finely, very sparsely punc- 

 tate, the punctures extremely fine and rather feeble toward the middle, with- 

 out trace of an impunctate median line. Elytra at base but very slightly wider 

 than the prothorax, less than three times as long as the latter and, in the 

 middle, about one-third wider ; apex gradually very acute ; humeri rounded ; 

 disk finely, irregularly punctxired, the punctures rather dense laterally, sparser 

 and with indefinite distant series of very fine punctures toward the suture. 

 Mesosternum deeply excavated. Length 10.0 mm. ; width 4.0-4.3 mm. 



Mexico — State of Guerrero. Mr. Baron. 



The elytra have very broadly and feebly impressed longitudinal sulci, which 

 are more pronounced toward the suture, the intervals there becoming very 

 feebly convex and equal to them in width ; this structure is very similar to 

 that previously described in Eurymetopon discors and other allied species. 



