104 BULLETIN 63;, UNITED STATES NATIONAL MUSEUM. 



The mesofeiiiora are feebly tumid, and the grooves have feebly 

 formed margins that are finely muricate, becoming contiguous and 

 evanescent at middle. 



The metafemora have subparallel surface lines, and the grooves are 

 as on the mesofemora. 



The tibiie are without tarsal grooves and the articular cavities are 

 closed. All of the tarsi are missing on the authentic specimen under 

 consideration, excejjt a single metatarsus and that is proportioned as 

 in h umeralis. 



GROUP II. TRICOSTATA SECTION. 



The species of this group differ from those of Group I in the 

 broad, flattened form, -with the elytra truncate at base and the 

 humeral angles rectangular; the prothorax is likewise broadened at 

 base, with the angles rectangular, overlapping the humeral angles 

 of the elytra. The pronotal disc is much less declivous laterally and 

 the marginal bead is always visible when the surface is viewed verti- 

 cally from above ; there is consequently scarcely any variation in the 

 characteristic pronotal outline. 



The anterior spurs of the anterior tibiae are distincth" thickened and 

 broadened in both sexes, less so in the male where they are always 

 more so than in the same sex of the preceding group. 



The first joint of the anterior tarsi is always more or less thickened 

 at tip beneath and even slightly produced ; a tuft is also evident. 



In the females the dorsal j^lates of the genital valves are broad and 

 oblong. (See Plate 1, fig. 11, and Plate 3, fig. 20.) 



There is also a development of pubescence in one species at least. 

 The hairs are setiform. 



ELEODES TRICOSTATA Say. 



Blapfi tricnstnfa Say, Journ. Acad. Nat. Sci. I'Liila., Ill, 1S23, p. 262. 

 Elcodcs tneo.stata LeConte, Proe. Acad. Nat. Sci., PLiila., 1858, p. 181. — 



Horn, Traus. Amer. Phil. Soc, XIV, 1870. p. 307. 

 Eleodes planata Solier, Stndi Ent., 1848, p. 366. 

 Pimelia alternata Kirby, Fauna Boreali-Amer., IV, 1837, p. 232. 

 Eleodes rohuxta LkContk. I'roc. Acad. Nat. Sci, Phil., 1858, p. 183. 



Oblong (o oblong-oval, black, opaque, clothed with short setiform 

 hairs, each arising from a puncture. 



Head moderate, feebly convex, rather finely, more or less densely 

 and evenly punctate, punctures more or less sparse on the vertex ; 

 frontal suture usually defined, surface more or less broadly impressed 

 across the fronto-epistomal junction. Antennce moderately short, not 

 reaching to (he prothoracic ])ase, outer three joints very feebly com- 

 jjressed, scarcely dilated, third joint hardly as long as the next two 



