34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



broadly, transversely truncate in front; prosternal process broad, the 

 sides parallel to behind the coxal cavities, then obliquely narrowed to 

 the apex, which is acute. Tibiae slender, the anterior and middle 

 pairs slightly arcuate and armed with a very small tooth on inner 

 margin at apices. Posterior tarsi about one half as long as the tibiae, 

 the first joint as long as the following three joints united. Tarsal 

 claws similar on all feet, cleft near the middle, the inner tooth broad, 

 shorter than outer one, and not turned inward. 



Length, 7.25 mm; width, 1.6 mm. 



Type locality. — Tejupilco, Mexico, D.F. 



ry^e._U.S.N.M. No. 49569. 



Reiiwrhs. — Described from a single male collected at the type 

 locality at an altitude of 3,960 feet, during July 1932, by H.' E. 

 Hinton. 



This species resembles ruficollis Fabricius, but it differs from that 

 species in being slenderer, in having the head nearly convex in front, 

 the antennae serrate from the fifth joint, the pronotum with the 

 surface coarsely, transversely rugose, and the anterior margin 

 strongly produced at middle, and in each elytron having an obtuse, 

 longitudinal, median costa. 



TAPHROCERUS SHANNONI, new species 



Elongate, more strongly attenuate posteriorly, feebly flattened 

 above, glabrous; above and beneath uniformly black, with a vague 

 aeneous reflection in certain lights. 



Head slightly narrower than pronotum at base, strongly convex 

 from top to bottom, nearly flat transversely, the front slightly wider 

 at top than at bottom, lateral margins feebly converging from top 

 to bottom, with a shallow, triangular depression behind the epis- 

 toma, and a vague, narrow, longitudinal groove extending from the 

 depression to the occiput ; surface finely, densely reticulate, sparsely, 

 finely, irregularly punctate, clothed with a few short, inconspicu- 

 ous hairs. 



Pronotum moderately convex, twice as wide as long, subequal in 

 width at base and apex, widest at basal third; sides when viewed 

 from above obliquely expanded from apical angles to basal third, 

 then obliquely narrowed to the posterior angles, which are obtusely 

 angulated ; anterior margin transversely truncate ; base transversely 

 truncate to middle of each elytron, with the median lobe moderately 

 produced and arcuately emarginate in front of scutellum; disk 

 feebly, narrowly, transversely depressed along anterior margin, 

 broadly depressed along lateral margins, the depression extending 

 obliquely backward on each side to the base, with a rounded eleva- 

 tion near the posterior angles; surface densely, finely reticulate, 



