MONOCHARIS.—SCIOCHARIS. 569 
reaching the base, but rather further from the front margin. Elytra elongate, densely 
and distinctly punctate, rather shining. 
The unique example is probably a female; it is in a very fragile state, and I have 
_ damaged it a good deal in attempting to manipulate it in order to see all its characters. 
It can scarcely remain in this genus, but cannot be placed in any other at present 
formed. The mandibles are moderately long, quadridentate; the outline of the 
labrum I cannot see definitely, but do not think it differs much from that of the other 
species of this genus. The prosternal process and side-pieces are largely developed. 
The front tarsi are well dilated, their terminal joint stout. The basal joint of the 
hind tarsus is apparently quite short, the terminal joint being stout and elongate, 
almost as long as the other four together. If this be correct, and the tarsi have really 
four equal short basal joints, the insect should clearly be a distinct genus, 
MONOCHARIS. 
Corpus sat convexum, laxe pubescens. Caput convexum, collo angusto. Tarsi anteriores vix dilatati; posteriores 
sat elongati, quam tibiz paullo breviores, articulo quarto brevi, articulo quinto ad articuli tertii basin 
proxime inserto. 
This genus is allied to Ophiomedon, though different in appearance, but the compa- 
rative elongation of the hind feet, accompanied by minor differences in many details, 
requires its separation, and it is in fact a connecting link between Medon and Monista. 
The mandibles are quite short, the labrum not large, its front margin nearly simple. 
The neck is very slender, as in Stilomedon. The prosternal structure is that of Stélo- 
medon. ‘The middle cox are small, deeply embedded. The hind feet are slender, 
and have the basal joint rather elongate, considerably longer than the second. The genus 
at present will comprise only one species. 
1. Monocharis vestita. (Tab. XIV. fig. 22.) 
Lithocharis vestita, Sharp, Trans. Ent. Soc. Lond. 1876, p. 259°. 
Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet, Bugaba (Champion).—Sovutu 
AMERICA, Caracas (Sallé), Amazons valley !. 
An example from Caracas of this species is extant in Chevrolat’s collection under the 
name Lithocharis parvicollis, Chevr. 
SCIOCHARIS. 
Sciocharis, Arribalzaga, Bol, Ac. Arg. vii. p. 260 (1884). 
This genus is peculiar to the New World, where it appears to be numerous in 
species, and extends as far south as Buenos Ayres; it will probably be found to be 
represented in Mexico and the Southern States of the North-American Union. In 
addition to the species mentioned by Arribdlzaga, it must comprise Lithocharis oculata 
and L. humilis, and probably also Z. egena and L. ardua, Sharp. 
Most of the species are found on the sandy banks of streams (Champion). 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, July 1886, 4 DD 
