. SISENES. 141 
two rather deep oblique depressions on each side, one behind and one before the middle, and a more or less 
distinct median ridge, the surface densely and finely punctured; elytra moderately long, rather broad, 
widest beyond the middle, densely and finely punctured, and with two fine sharp coste on the dise and 
one at the sides, the inner one becoming obsolete at about one-third from the apex and the two outer ones 
confluent behind, the suture also distinctly raised; beneath closely and finely punctured and pubescent, 
piceous, the venter and prothorax sometimes brown; legs piceous or brown, the penultimate joint of the 
tarsi tomentose beneath. 
Length 7-74 millim. (9.) 
63 
Hab. Nicaracua, Chontales (Belt, Janson). 
Four examples. 
18. Sisenes suturalis. (Tab. VI. fig. 23, ° .) 
Elongate, thickly pubescent, very opaque, ochraceous, with the space between the points of insertion of the 
antenne and the sides of the head, the labrum, the tips of the mandibles, the sides of the prothorax in 
front, and the suture of the elytra very narrowly to beyond the middle, piceous-black. Head as wide as 
the prothorax, densely and finely punctured, the eyes rather small; antenne ( @ ) black, moderately long, 
very stout, tapering outwardly and with joints 3-5 much thicker than the others, joint 2 short ; prothorax 
distinctly longer than broad, the sides very feebly rounded before the middle, a little constricted behind, 
and shallowly emarginate in front immediately before the apex, the front and hind angles slightly 
prominent, the base grooved within, the disc with a large oblique rather deep depression on each side just 
behind the middle and very shallowly transversely depressed on either side in front of this, the surface 
densely and finely punctured ; elytra very long, subparallel, densely and rather finely punctured, and with 
two prominent coste on the disc and one at the sides, the inner one not reaching the apex and the two 
outer ones confluent behind, the suture also distinctly raised ; beneath closely and finely punctured and 
pubescent, entirely piceous; legs rather slender, brownish-black, the penultimate joint of the tarsi 
tomentose beneath. 
Length 9 millim. (@.) 
Hab. Muxico, Cerro de Plumas (Hége). 
One example. The much more elongate shape, larger size, differently-formed 
antenne, &c. distinguish this insect at once from S. délaticornis. 
19. Sisenes lyciformis. (Tab. VI. figg. 24,3; 24a, labium; 24 6, maxilla and 
maxillary palpi; 24 ¢, edeagus.) 
Elongate, the head and prothorax sparsely, the elytra thickly, pubescent, opaque; the prothorax and the basal 
half of the head coppery- or crimson-red, the anterior portion of the latter bronze or obscure violaceous, 
and the sides of the front and the mandibles pale flavous, the labrum and palpi piceous; the elytra 
black, blackish-brown, or brown, often with a violaceous or coppery tint in certain lights, the shoulders (or 
the sides for some distance), and sometimes the extreme base or a longitudinal space on either side of the 
suture in front, brownish-yellow. Head about as wide as the prothorax in the female, broader in the 
male, densely and rather coarsely punctured, the eyes small; antenne black, rather long, tapering out- 
wardly, joint 2 short, joints 3-5 very much stouter than the others in both sexes but much stouter in the 
female than in the male, the following joints comparatively slender; prothorax subquadrate, the sides 
slightly rounded’ before the middle and feebly sinuate behind, the hind angles rather (and sometimes the 
front angles slightly) prominent, the base grooved within, the disc with a large deep oblique depression on 
each side behind the middle, shallowly transversely depressed in front, and with an interrupted more or 
less distinct median ridge, the surface coarsely, closely, and roughly punctured, the punctuation much 
coarser and rougher than that of the head; elytra long, a little flattened on the disc, narrow and more 
parallel in the male, broader and widening to beyond the middle in the female, the surface very densely 
