56 GEO. H. HORN, M. D. 



A. acerbus n. sp. — Oblong, moderately convex, parallel, reddish brown, 

 moderately shining. Antennse rufo-testaceous. Head convex, coarsely and 

 deeply, not densely punctured, front not tuberculate. Clypeus with a distinct 

 transverse carina, impressed in front, moderately deeply emarginate at middle, 

 on each side a small acute tooth, sides irregularly arcuate, gense feebly prominent 

 and obtuse. Thorax distinctly narrowed in front, the sides feebly arcuate, 

 sparsely fimbriate, hind angles very obtusely rounded, base arcuate, with distinct 

 submarginal line, disc convex, relatively coarsely, but sparsely punctured, the 

 punctures finer and obsolete near the sides. Elytra as wide as the thorax, humeri 

 obtuse, sides parallel, disc striate, strife, moderately coarsely and closely punctured, 

 intervals convex, with a single series of irregular finer punctures. Body beneath 

 sparsely indistinctly punctate, abdomen with slight pubescence. Posterior femora 

 smooth, the first joint of hind tarsus very little longer than the next two. 

 Length .12 inch ; 3 mm. 



No sexual characters observed in two specimens. 

 This is a small and inconspicuous species resembling nanus in form 

 and coloration, but differing in the very distinctly bidentate clypeus. 

 Occurs in Texas, probably near San Antonio. 



Group It. 



Scutellum small. Front not distinctly tuberculate. Elytra more 

 or less pubescent. Mesosternum not carinate between the coxae. 

 Thorax with basal marginal line, except in rubripennis. 



This group, although containing but few species, is somewhat 

 heterogeneous, the first and last species being the troublesome ele- 

 ments, while the others naturally associate themselves. 



The following table will enable them to be separated : 



Gente. at least moderately prominent; head and thorax in great pai-t black. 

 Thorax entirely black, without basal marginal line; clypeus almost semicir- 



cular^ elytra reddish rubripeuuii^. 



Thorax pale at the sides, a distinct basal line. 



Elytra entirely yellow, merely the suture darker subtriiucatus. 



Elytra clouded with fuscous. 



Sides of thorax fimbriate with rather long hair ; anterior tibiffi with upper 



tooth small or wanting Walsliii. 



Sides of thorax not fimbriate ; anterior tibia normal. 



Elytra with greasy aspect, the pubescence well marked, color almost 



entirely fuscous ft^iiioralis. 



Elytra shining, pubescence feeble and deciduous, color more of yellow 



than of fuscous prodroiiitis. 



Geufe not at all prominent; entire surface ferruginous ; pubescence well marked ; 

 species rather small teuuistriatus. 



