HOEISTONOTTJS.— ESTHESOPUS. 439 



20. Horistonotus zunilensis. 



Moderately elongate, slender, shining, sparsely pubescent ; reddish-brown, the elytra indeterminately testaceous 

 towards the base, the antenna? and legs testaceous. Head somewhat finely punctured, with a few minute 

 punctures intermixed ; antenna) slender, half the length of the body. Prothorax considerably broader 

 than long, feebly convex, wider at the base than at the apex, the sides moderately rounded and 

 converging from the middle forwards and slightly sinuate behind ; the hind angles moderately produced ; 

 the surface very sparsely, minutely punctate, with some slightly coarser punctures intermixed ; the base 

 sinuate and bi-incised on either side. Elytra about three times the length of the prothorax, and wider 

 than it at the base, a little dilated at the sides at about one-fourth from the base and narrowing thence 

 to the apex, the sides slightly rounded, the humeri rounded externally ; rather finely punctate-striate, the 

 interstices feebly convex, flatter towards the suture, and sparsely punctured. Beneath minutely punc- 

 tured, with distinct intermixed coarser punctures. Claws simple. 



Length 5, breadth 1| millim. ( J •) 



Hab. Guatemala, Cerro Zunil {Champion). 



One male example. This insect approaches H. bicinctus, but it is narrower, thus 

 appearing more elongate ; the thorax is almost parallel at the sides behind, the 

 punctuation very sparse, fine, and unequal ; and the claws are simple. It is the 

 only Central-American species of the genus known as yet with simple claws. The 

 puncturing of the thorax is unusually sparse. 



ESTHESOPUS. 



Esthesopus, Eschscholtz, in Thon's Archiv, ii. 1, p. 32 (1829) ; Caudeze, Monogr. Elat. iii. p. 274. 

 The thirty-three described species of this genus are all American, ranging from the 

 Southern United States to La Plata. Thirteen are now recorded from within our 

 limits, six of which are described as new. Esthesopus agrees with Horistonotus in 

 having the carina separating the pronotum from the propleurse strictly lateral (instead 

 of being placed beneath, as in Cardiophorus and Aptopus) ; but differs from it in the 

 more or less lamellate fourth tarsal joint, this character becoming very feeble, however, 

 in E. scapularis, E. coarctatus, and their South-American allies. In all the Central- 

 American species the tarsal claws are rectangularly dilated from the middle to the base. 

 The head, thorax, and under surface have usually a double system of punctuation, but 

 in some few species, E. bifasciatus, &c, it is single. Good differential characters are 

 to be found in the form of the scutellum and in the relative length of the marginal 

 carina of the thorax. 



a. Prothorax without notches or sulci at the base, the marginal carina ex- 

 tending almost to the anterior angles ; scutellum raised anteriorly and 

 more or less convex; body more or less flattened above; antennse short; 

 fourth tarsal joint lamellate. 

 a'. Prothorax with a double system of punctuation, the small punctures 

 distinct. 

 a". The larger punctures becoming much coarser towards the sides and 

 base, those in the transverse basal depressions very coarse and con- 



