390 PHYTOPHAGA. 



1. Oxygona acutangula. 



Platiprosopus acutangulus, Chevr. Col. Mex. Cent. i. fee. 3, nr. 68 (Nov. 1834) \ 



Oxygona acutangula, Clark, loc. cit. p. 390. 



Oxygona melanocera, Erichs. Schomb. Reisen Guiana, iii. p. 578 2 . 



Bob. Mexico 1 , Playa Vicente, Vera Cruz, Cordova {SalU), Jalapa, Oaxaea, Cerro de 

 Plumas {Edge) ; Beitish Hondueas, Rio Hondo (Blancaneaux) ; Guatemala {Salle), San 

 Geronimo {Champion) ; Nicaeagua, Chontales ( Janson) ; Costa Rica, Cache {Bogers) ; 

 Panama, Volcan de Chiriqui, Bugaba {Champion).— Colombia (coll. Jacoby); Guiana 2 . 



The numerous specimens before me from the above localities exhibit some slight 

 variations in size and in the colour of the antennae, which, together with the extreme 

 apex of the tibia? and the tarsi, are generally black, but in some specimens fulvous ; 

 structural differences of any importance I cannot find. The species has been well 

 described by Clark. 



2. Oxygona bifasciata. 



Flavous ; elytra very finely punctured, obscure fulvous, a transverse band at the base and another below the 

 middle black. 



Length 3 lines. 



Head with a central round fovea on the vertex, impunctate; antennae two thirds the length of the body, 

 obscure fulvous, the basal joint stained with piceous above ; thorax three times as broad as long, the sides 

 narrowly margined and rounded, constricted at the base, the anterior angles acute and produced, surface 

 impunctate ; scutellum flavous ; elytra very finely punctured, the bands broad, the anterior one occupying 

 one third the length of the elytra, the other the apical third portion. 



Hab. Panama, Volcan de Chiriqui {Champion). A single specimen. 



The species here described seems allied in coloration to 0. succinctus, Clark, but 

 differs in the impunctate head and in the different shape of the transverse posterior 

 elytral band, which in Clark's species does not extend to the sides ; the antennae in the 

 latter species are also differently coloured. 



PSEUDOGONA. 



Palpi filiform, their penultimate joint not thickened ; thorax subquadrate, the anterior angles not produced ; 

 all the other characters as in Oxygona. 

 I am obliged to constitute this genus for the reception of two species from the State 

 of Panama, and to separate them from Oxygona on account of the totally different shape 

 of the thorax, which is only about one half broader than long, instead of being of the 

 narrow transverse shape as in the allied genus ; the palpi also are filiform and thin, the 

 eyes larger, and the frontal tubercles very obsolete and narrowly transverse. Pseudogona 

 is also closely allied to Systena, but the entire absence of a thoracic groove and the 

 rather differently shaped antennse will not permit me to include these insects in that 

 genus. In Systena there is also generally a want of a transverse groove on the vertex, 



