MALACODERMATA. 301 
The elytra are of a dark steel-blue. The female is similar to the male, with the excep- 
tion that the excision of the hind angles is less deep. 
About a dozen examples were collected by Mr. Champion, one from the altitude of 
8000 feet ; all were found on leaves in the dense virgin forest. 
12 (a). Silis jocosa. 
Rufo-testacea; elytris nigris, basi excepta albo-cinctis ; metasterno abdomineque nigricantibus, hoc segmentis 
singulis albo-marginatis. Long. 53-63 millim. ¢ Q. 
Mas. Prothoracis margine laterali processu duplici lamellato, anteriore cultriformi, apice ciliato, posteriore 
contorto, disco foveola profunda punctiformi impresso. 
Femina. Prothoracis disco postice leviter impresso, angulo postico minute exciso. 
Hab. Panama, Volcan de Chiriqui, Bugaba (Champion). 
This species was recorded (anté, p. 96) asa variety of 8. albicincta, which it very 
much resembles; I have, however, distinguished it now for the following reasons :— 
The eyes are always much smaller in both sexes; the head, antenne, and legs are 
red; the elytra in the male are more expanded behind; the processes of the thorax of 
the male are much more developed, and more distorted and confused. The mandibles 
of the female are very long and thin, evenly curved, not suddenly bent. 
A considerable series was taken by Mr. Champion. 
12 (zs). Silis torticollis. 
Nigro-fusca ; ore prothoraceque fulvo-testaceis, hoc medio szepe nigricante. Long. 5-53 millim. ¢ Q. 
Mas. Prothoracis lateribus foliaceo-contortis, auriculatis, antice nigricantibus. 
Femina. Prothoracis lateribus lamina subtuberculari parum elevata instructis. 
Hab. Panama, near the city, San Miguel in the Pearl Islands (Champion). 
Belonging to the same section as S. dilacerata, but wholly distinct by the very 
curious complicated structure of the prothorax of the males. The anterior lamellar 
process here takes the form of a hood, curving over two dentiform lamellar processes 
behind. Anything more complicated in the way of a twisted margin can hardly be 
conceived. Females of this section of Stlis may easily be recognized by their 
antenne, which in this group are rather short and flat and finely serrate in both sexes. 
The thoracic fovea is present in the male as a longitudinal furrow; in the female the 
disc is only somewhat uneven and tumid. 
A small series was captufed by Mr. Champion in the Pearl Islands, and one speci- 
men near the city of Panama. 
12 (c). Silis festiva. 
Rufo-testacea, nitida; capite elytrisque nigris, his (basi excepta) albo-marginatis, illo ore rufo, pectore abdo- 
mineque fuscis. Long. 53-6 millim. ¢ 2. 
Mas. Prothoracis lateribus processu duplici lamellato, anteriore angulato hamato, disco foveola profunda 
punctiformi impresso ; oculis magis globosis. 
Femina. Prothoracis disco postice leviter impresso. 
