AMERICAN COMPONENTS OF THE TENTYRIIN^ 285 



verse, inserted to the large prominent eyes, the supra-orbital carina 

 not joining the lateral margin as it does in angiistus^ opaque, 

 sparsely, very obscurely, tubercularly punctate throughout, the 

 vertex very feebly impressed along the median line ; antennas very 

 slender and similar but shorter, not two-fifths as long as the 

 body ; prothorax more transverse, nearly three-fourths wider than 

 long, widest at the middle, the sides evenly and strongly arcuate, 

 equally converging toward apex and base which are subequal in 

 width, the former sinuato-truncate with obtuse angles, the latter 

 rectilinear, finely reflexed and beaded, with the angles very 

 obtuse; surface strongly convex, opaque and strongly micro- 

 reticulate throughout but not definitely punctate ; elytra propor- 

 tioned nearly as in angustiishwX. only about a sixth wider than the 

 prothorax, similarly parallel and straight at the sides, the apex 

 rather abruptly ogival, the surface polished, not reticulate, with- 

 out impressed lines except one at each side of the sutui'e which 

 is very feeble, the surface feebly subrugose, finely, sparsely and 

 muricately though very indistinctly punctured at the sides only ; 

 under surface nearly as in attgiistiis but duller in lustre. Length 

 4.8 mm. ; width 1.6S mm. Utah (southwestern), — C. J. VVeidt. 



subhyalinus n. sp. 



The species, excepting angustus, are very rare and apparently 

 represented by uniques at the present time. In the published 

 figure of tcstaccus^ the elytra are relatively very much broader 

 than in either angustus or stibhyalinus ; the above description is 

 a transcription of the original. 



Tribe Eurymetoponini. 

 This tribe has been known hitherto under the name Thino- 

 batini, with the Chilean Thhiobatis Esch., as the representative 

 type. The published characters of that genus do not, however, 

 seem to harmonize sufficiently with our American and Mexican 

 species to be properly included with them, it being stated by 

 Lacordaire that the scutellum is scarcely visible, and infer- 

 entially, that the elytra are rather infiexed beneath, with narrow 

 epipleuras ; the figure given by Solier shows, also a different 

 form of prothorax and prominent truncate epistoma. It would 

 appear, therefore, that our numerous species extending from 

 Utah to southern Mexico, which hold together in very homo- 

 geneous fashion, having the scutellum invariably well developed 

 and the elytra not infiexed beyond the rather wide entire epi- 

 pleurse, should constitute a distinctly limited tribe to be desig- 

 nated as above. 



