294 Dr. G-. H. Horn on Rhagodera tuberculata. 



maxillae are exposed. The gular peduncle distinct. lEpistoma scarce- 

 ly emarginate; apex of labrum alone visible. Head immersed in 

 thorax as far as the eyes, which are round and very coarsely granu- 

 lated as in the Stenosiini, not narrowed behind the eyes. Thorax 

 truncate anteriorly, with deep antennal grooves extending from the an- 

 terior angles to nearly the middle of the lateral margin. Coxae widely 

 separated. Tarsi not sulcate beneath. Antennae 11-jointed, joints dis- 

 tinct, the last three broader. The pores of the antennae occupy spongy 

 patches at the anterior distal angles of the ninth and tenth, and a si- 

 milar position on the last joint, though extending towards the apex. 



The above assemblage of characters, though pointing to affinities 

 with the Zopherini, require the formation of a separate tribe for the 

 reception of this genus. The name Usechini is, therefore, proposed 

 for the tribe, the position of which is undoubtedly near the Zopheri- 

 ni, from which it may be readily distinguished by the rounded and 

 coarsely granulated eyes. To enable this tribe to occupy its proper 

 position, the following modification of the table of tribes, as given by 

 Dr. LeConte, (Class. Coleop. iV. A.) is proposed : 



Tibial spurs very minute. 



Anterior coxse widely separated. 



Eyes transverse, finely granulated Zopherini. 



Eyes rounded, coarsely granulated Usechini. 



Anterior coxse narrowly separated ; antennse 11-jointed Stenosiini. 



Anterior coxse contiguous; antennas 10-jointed Dacoderini. 



On RHAGODERA TUBERCULATA, Mann. 

 BY GEO. H. HORN, M. D. 



Having in the preceding paper made mention of the confusion of 

 two distinct insects, members of different families, I have thought it of 

 importance to entomological science to give more at length than has 

 been done in American publications, a description of this genus and 

 species, and briefly describe a new one from Arizona. The first notice 

 of this genus occurs in the second Catalogue of Dejean. Erichson in 

 his Insecten Deutchlands, III, p. 255, makes short mention of it, while 

 Manuerheim (Bull. Mosc. 1843, p. 300,) gives a short description of 

 the species. 



Generic characters. — Mentum transversely quadrate, rounded in 

 front. Ligula rounded anteriorly, scarcely visible beyond the mentum. 

 Lateral processes of the gula exceeding the mentum ; moderately broad. 



