140. : HETEROMERA. 
side of which are two deep depressions, and the subquadrate form of the thorax 
distinguish this species from all others of the genus. In one of the Mexican examples 
the elytra have the basal half indeterminately testaceous. 
A female specimen from El Reposo is figured. 
16. Sisenes eximius. (Tab. VI. figg. 20,9, var.; 21,6.) 
Moderately elongate, thickly pubescent, opaque; the head blackish- or greenish-bronze, the sides of the front 
and mandibles flavous, the tips of the latter, the epistoma, and labrum piceous; the prothorax orange or 
ochraceous, with a blackish-eneous or blackish-violaceous stripe on each side of the disc; the scutellum 
ochraceous ; the elytra variable in colour—-usually bluish-black or very dark violaceous with the basal 
half-or more of the sides broadly, and the suture for a very short distance helow the scutellum, ochraceous, 
or, more rarely, ochraceous with a narrow oblique dark violaceous stripe on each elytron running from the 
base to a little below the scutellum, the stripes here becoming confluent and continued narrowly down 
the suture to about the middle. Head a little broader than the prothorax in the male, densely and finely 
punctured, often shallowly grooved along the middle, the eyes rather small; antenne black, stout, 
moderately long, tapering outwardly, joints 3-5 the stoutest in both sexes, but more distinctly so in the 
female, joint 2 very short; prothorax subquadrate, the sides slightly rounded in front and almost straight 
behind, the hind angles not prominent, the base grooved within, the disc with a rather deep oblique 
depression on each side behind the middle, a shallow transverse depression on either side in front of this, 
and a more or less distinct fine median ridge, the surface densely and finely punctured ; elytra rather short, 
subparallel in the male, broader and widest beyond the middle in the female, densely and finely punctured, 
and with two fine costz on the disc and one at the sides, the inner one extending to about the middle 
and the others nearly to the apex, the suture also raised; beneath finely and closely punctured and 
pubescent, piceous, with an seneous lustre; legs slender, black or brownish, the penultimate joint of the 
tarsi tomentose beneath. 
3. Fifth ventral segment very feebly emarginate; the sixth with the lateral lobes short and clothed with 
long hairs. 
Length 43-63 millim. (¢ 2.) 
Hab. Panama, Bugaba, Volcan de Chiriqui, David (Champion). 
Numerous examples, the majority of them being females. This little species is 
allied to S. dilaticornis, from which it may be distinguished by its smaller size and 
much shorter and differently-coloured elytra, and also by the less dilated intermediate 
joints of the antenne in the female. As in the allied forms, the male seems to be 
much rarer than the female. 
We figure a typical male and a variety of the fondle. both from Bugaba. 
3. Antenne with joints 3-5 much thickened in both sexes (at least in 8. lyciformis and 
S. mimetes) ; eyes feebly emarginate ; elytra with fine coste. Species Lyciform. 
17. Sisenes dilaticornis. (Tab. VI. fig. 22, 2.) 
Moderately elongate, thickly pubescent, opaque, ochraceous, the head (except in the middle behind and at the 
sides in front) bronze, the prothorax with a piceous stripe on each side of the disc, the stripe sometimes 
continued on to the base of the elytra. Head as wide as the prothorax, very closely and finely punctured, 
the labrum and the tips of the mandibles piceous, the eyes small ; antennx ( Q ) black or fusco-ferruginous, 
moderately long, stout, with the joints from the third somewhat flattened, tapering outwardly and with 
joints 3-5 broader than the others, joint 2 short; prothorax subquadrate, the sides a little rounded in 
front and almost straight behind, the hind angles not prominent, the base grooved within, the dise with 
