SISENES. 31 
mediate in this respect between S. cyanipennis and the numerous species with the 
penultimate joint only of the tarsi tomentose beneath. 
The Lyciform species have the antenne formed very much as in the Chilian genus 
Mecopselaphus ; the latter, however, has a Lampyriform facies (it was included in the 
Malacoderms by its describer), the head more exserted and longer, and the thorax 
very differently shaped ;. Mecopselaphus lycoides, Kirsch, from Peru, is, no doubt, con- 
generic with these aberrant mimetic forms. 
The members of this genus are all well defined, though in several the elytra vary 
very considerably in colour. They are found upon leaves or herbage. 
1. Antenne very gradually tapering outwardly or filiform in both sexes. Species 
Telephoriform. 
a. Larsi with joints 1-4 of the front and middle pairs and 2 and 3 or 3 of the hind 
pair tomentose beneath ; eyes comparatively large, rather deeply emarginate ; elytra 
with series of faintly impressed double lines. 
1. Sisenes cyanipennis. (Tab. VI. figg. 9,3; 9a, labium; 95, maxilla and 
maxillary palpus; 9 ¢, cedeagus.) . 
Elongate, finely pubescent, opaque, the head and elytra blackish-violaceous or dark cyaneous, the prothorax 
and scutellum orange or orange-yellow. Head densely and coarsely punctured; eyes large and convex, 
more contiguous in the male, rather deeply emarginate, the canthus smooth; antenne long and stout, 
tapering outwardly, black, joint 2 about one-third of the length of 3, 3 and 4 subequal; prothorax about 
as long as broad in the male, transverse in the female, somewhat convex, the sides rounded in front and 
converging behind, the hind angles prominent, the base rather strongly margined, the disc feebly trans- 
versely depressed before the apex, transversely depressed at the base, and sometimes with a shallow depres- 
sion on each side about the middle, the surface densely and not very finely punctured ; elytra moderately 
long, broadest at the base, the sides straight and gradually converging, the apices obtuse, the surface scabrous 
and with indistinctly-marked series of double lines on the disc ; beneath clothed with longer pubescence, 
orange-yellow, the venter, and coxe in part, violaceous or ceruleous, finely and densely punctured ; legs 
stout, thickly pubescent, moderately long, blackish-violaceous, joints 1-4 of the anterior and middle tarsi 
and 2 and 3 of the hind tarsi clothed with a thick pad of short hairs beneath. 
3. Fifth ventral segment deeply triangularly emarginate ; the sixth with the lateral lobes very large and 
spoon-shaped, these resting one over the other in repose and protruding beyond the fifth. 
Length 12-14 millim. (¢ @.) 
Hab. Nicaragua, Chontales (Belt, Janson); Panama, Bugaba, Volcan de Chiriqui 
(Champion). 
Seven examples. This very distinct species somewhat resembles Diplectroides flavi- 
collis, from which its less elongate shape, more coarsely punctured head and prothorax, 
shorter and stouter limbs, and violaceous colour distinguish it, apart from the differences 
in the form of the mandibles, palpi, &c; the sixth ventral segment of the male is 
very similarly shaped. 
SS 2 
