104 LONGICORNIA. 
typical genera are further recognizable by the general form of the antenne, which are 
shorter than the body and have the terminal joints from the fifth much abbreviated, 
closely fitted together, with the end joint pointed. In some of the genera, however, 
the antenne are lengthened, being considerably longer than the body. The degree of 
dehiscence of the middle haunch-sockets is variable; and the mesosternal epimera are 
sometimes very short, not reaching the aperture of the sockets. This structure seems 
to have misled Lacordaire, who gives, in some of the genera, the middle sockets (“ cavités 
cotyloides ”) as closed, which they are not in reality. Owing partly to this and partly to 
his habit of regarding geographical distribution as a group-character, he was led to 
divide the Apomecynini unnecessarily into numerous minor groups. | | 
PARMENONTA. 
Parmenonta, Thomson, Physis, ii. p. 157; Lacordaire, Gen. ix. p. 273. 
Lacordaire referred this genus to the Dorcadionini, owing to the superficial similarity 
of its species to the Parmene. He had not, at that time, noticed the systematic value 
of the degree of divergence of the tarsal claws; otherwise he could not have failed to 
recognize the true affinities of the genus. Parmenonta, in fact, is connected by insen- 
sible gradations with Adetus (=Agennopsis, Thoms., Lac.). It is sufficiently distinct, 
however, by its shortened metasternum (and consequent approximation of the two 
hinder pairs of legs) and the more or less dilated or suboval form of the elytra. Five 
species are now known, from South Brazil, Central America, and Mexico; it has not 
yet been recorded from the northern parts of Tropical South America. 
Lacordaire describes the elytra as soldered together, which is not the case: they are 
free; and the under wings are present. He says also that the intermediate tibie have 
neither groove nor sinus on their outer edge: this also is not strictly exact; they have 
a shallow sinus, fringed with the usual longish hairs, near the apex. The same tibie 
in P. valida have also a tooth-like projection at their inner apices, a structure more 
strongly pronounced in the male than in the female; it is not seen, however, in the 
other species. 
The group appears to have a real affinity with Parmena, but a much closer one with 
the Xylotolini, an interesting group consisting chiefly of Antarctic forms, which has not 
yet been systematically defined. 
1. Parmenonta valida. (Adetus validus, Tab. VIII. fig. 3.) 
Parmenonta valida, Thomson, Physis, ii. p. 158°. 
Hab. Mexico}, Cordova (Sallé); GuatTEeMaLa, San Juan, Vera Paz (Champion) ; 
British Honpuras, Belize (blancaneaur) ; Nicaragua, Chontales (Belt). 
Some of the Central-American specimens have a distinctly longer metasternum than 
