SCIOPORUS.—STILOMEDON. 565 
10. Scioporus ——? 
Hab. Panama, Bugaba (Champion). 
A specimen in too fragmentary condition for close examination, represents apparently 
a species near S. Jatifrons, but with the basal portion of the elytra pale yellow. 
STILOMEDON. 
Corpus depressum, dense minus subtiliter punctatum. Caput subquadratum, collo angusto. Tarsi omnes breves ; 
anteriores dilatati; posteriores articulo quarto membranaceo, sub articulo quinto prolongato. 
The chief peculiarity of this genus was pointed out by me some years ago when 
describing as members of Lithocharis some species that must now be referred to 
Stilomedon. It consists in the fact that the terminal joint of the hind and middle 
tarsus is inserted close to the third joint, the fourth joint being placed beneath the 
terminal joint, but remaining still very conspicuous owing to its greater width; it is 
semimembranous in texture. This genus, therefore, and Ophiomedon and Suniocharis, 
so far as the tarsi are concerned, connect the Lithocharis group of genera quite inti- 
mately with the forms near Sunius. 
Stilomedon is also remarkable by its slender neck and subpentagonal thorax; the 
chitinous pieces of the prosternum are greatly developed; the broad prosternal process 
attains the mesosternum and is overlapped by the side pieces, the coxal cavities (when 
the coxe have been removed) thus looking at first glance as if they were completely 
enclosed. 
The genus will include Lithocharis biseriata, Er., and L. discedens, Sharp, in addition 
to the species of our region. 
1. Stilomedon triseriatus. (Tab. XIV. fig. 20.) 
Depressus, opacus, ferrugineus, densissime punctatus; prothorace omnino densissime punctato, haud strigoso, basi 
conspicue quadripunctato ; elytris quam prothorax longioribus, seriebus tribus elongatis punctorum majorum. 
Long. 5 millim. 
Hab. Panama, David, Bugaba (Champion). 
Antenne short, ferruginous. Head large, quadrate ; coarsely and excessively densely 
punctate, so that the interstices are reduced to a very fine reticulation. Thorax not so 
long as broad, the sides much narrowed behind, the front strongly oblique on either 
side; the surface excessively densely punctate, so that the interstices are almost as 
minute as possible, but not strigulose; there is no median smooth line, but a very fine, 
short channel frequently exists on the posterior part, and on the hind margin there are 
four large punctures of equal size, the surface between them being feebly plicate. The 
elytra are much longer than the thorax, densely punctate, only feebly shining, and on 
each there exists three very distinct series of larger punctures which do not quite 
extend to the hind margin. The male has the penultimate ventral segment feebly 
