PLATYMORPHA.-— PTELEON. 603 



distinguished by the curious dilatation of the anterior tibiae and of the first joint of the 

 anterior tarsi. 



The two species I refer to this genus inhabit Mexico or Guatemala. 



1. Platymorpha variegata. (Tab. XXXIV. fig. 5.) 



Fulvous ; antenna, the femora above, and the tibiae, black ; elytra scarcely visibly punctured, black, the extreme 



lateral margins and the apices fulvous. 

 Var. Elytra fulvous, each with two small black spots. 

 S . Antenna with the joints widened, the anterior tibiae much widened and flattened at the apex, and the first 



joint of the anterior tarsi strongly dilated. 



Length 3 lines. 



Head impunctate, reddish-fulvous, the frontal tubercles indistinct; antennas longer than the body, black, the 



second and third joints extremely short, the following joints elongate, the eighth joint triangularly widened ; 



thorax twice as broad as long, its surface subdepressed, microscopically punctured, reddish-fulvous ; 



scutellum fulvous ; elytra scarcely more distinctly punctured than the thorax, black, the extreme basal 



and lateral margins and the apices fulvous ; femora fulvous, their upper edge marked with black. 



Hab. Mexico, Yolotepec (Salle) ; Guatemala, Capetillo (Champion). 



Of the variety there are two specimens before me ; these only differ from the typical 

 form in the elytra being pale fulvous in colour, with a small black spot placed at the 

 shoulder and a more transversely-shaped one at the middle. 



2. Platymorpha smaragdipennis. (Tab. xxxiv. fig. 6.) 



Chthoneis smaragdipennis, Jac. P. Z. S. 1879, p. 786 . 



Hab. Guatemala, Panajachel, Capetillo \ San Geronimo (Champion). 



A careful examination of additional examples of this species has proved to me that 

 the posterior tibiae are armed with a small spine; the insect in consequence is wrongly 

 placed in Chthoneis. The second and third joints of the antennae are very small, and 

 the thorax is deeply depressed on the disc and to a less extent near the anterior margin. 

 The male differs from that of P. variegata in having simple anterior tibiae and tarsi ; 

 it has the antennae, however, as long as in that species. The colour of the elytra is 

 bright metallic green and their surface is rugosely punctured throughout. 



PTELEON. 



Elongate ; antenna? with short subtriangular joints ; thorax transversely subquadrate ; scutellum broad, its 

 apex broadly rounded; elytra irregularly punctured, their epipleurae continued below the middle; legs 

 robust; aU the tibise armed with a spine; the first joint of the posterior tarsi scarcely longer than the 

 second joint; claws appendiculate ; the anterior coxal cavities open. 



Type Pteleon semicceruleus. 



The spine at the apex of the tibiae and the short subtriangular joints of the antennae 

 are the chief characters by which Pteleon is separated from Metacycla ; the first joint of 

 the posterior tarsi is also shorter than is the case in Metacycla. 



P 4h2 



