136 HETEROMERA. 
8. Sisenes sinanja. (Tab. VI. fig. 16, 2, var.) 
Closely allied to S. rubricollis; the elytra variable in colour—bluish-black, blackish-brown, or brownish- 
yellow; the head greenish-szneous or brownish, with the anterior part (the labrum and the tips of the 
mandibles excepted, these parts being piceous) flavous; the antenne black, very long and slender, reaching 
to far beyond the middle of the elytra in both sexes; the prothorax rosy-red or reddish-yellow, sometimes 
with a coppery lustre ; the head and prothorax sparsely pubescent, very slightly shining, and much more 
coarsely and less densely punctured than in S. rubricollis ; legs variable in colour—black or piceous-brown, 
in the examples with pale elytra with the basal half of the four hinder femora, and the inner part of the 
anterior femora nearly to the apex, testaceous; beneath thickly pubescent, very closely and finely 
punctured, flavo-testaceous in light-coloured examples and almost entirely piceous in dark-coloured ones, 
the flanks of the prothorax more or less suffused with cyaneous or violaceous; the rest as in S. rubricollis. 
3. Fifth ventral segment very deeply triangularly emarginate; the sixth with the lateral lobes long and 
spoon-shaped and protruding far beyond the apex of the fifth. 
Length 73-9 millim. (¢ 9.) 
Hab. Guatemata, Sinanja and Senahu in Vera Paz (Champion). 
One male and three female examples; the elytra are in two examples brownish- 
yellow and in the other two (¢ 2) bluish-black or blackish-brown. As in S. rudri- 
collis, the flanks of the prothorax are more cr less stained with violaceous and almost 
bare. The very different sculpture of the head and thorax, longer and more slender 
antenne, and other particulars, separate it easily from S. rubricollis. ‘The latter has 
the head and elytra very constant in colour, while in the present insect the reverse is 
the case, 
9. Sisenes telephoroides. 
Elongate, finely pubescent, subopaque, the head and prothorax slightly shining; the head bronze or greenish- 
bronze, the anterior part flavous, the labrum and tips of the mandibles piceous ; the prothorax orange- 
yellow ; the scutellum flavous or piceous; the elytra bronze-black or blackish-violaceous, sometimes of 
a plumbeous tint. Head distinctly broader than the prothorax, still broader in the male, closely and 
rather coarsely punctured, the eyes small; antennz moderately long, comparatively stout, black or piceous- 
brown, joint 2 not half the length of 3; prothorax as long as broad, shorter in some examples, the sides 
moderately rounded in front and feebly constricted behind, the base grooved within the prominent margin, 
the disc broadly transversely depressed in front, with a shallow depression on each side behind the middle 
(not always distinct), and an interrupted median ridge, the surface closely and rather coarsely punctured ; 
elytra moderately long, parallel, densely, confluently, and rather coarsely punctured, and with oné costa 
on the disc (the usual one between this and the suture obsolete) and another at the sides, the inner one _ 
of these obliterated beyond the middle in some specimens and in others continued nearly to the apex, the 
suture also raised; beneath closely and finely punctured and pubescent, the meso- and metasternum and 
the venter (except in the middle) eneous or sneo-piceous, the rest flavous; legs slender, variable in 
colour—piceous or brown with the base of the femora more or less testaceous, in some examples with the 
basal half or two-thirds of the latter abruptly flavous—the penultimate joint of the tarsi tomentose 
beneath. 
¢. Fifth ventral segment broadly and very feebly emarginate; the sixth with the lateral lobes short. 
Length 43-63 millim. (¢ 9.) 
Hab. Mexico, Jalapa (Hége), Misantla (fF. D. G.). 
This insect greatly resembles certain similarly-coloured Central-American species of 
Silis and Telephorus. The ten specimens obtained vary a good deal inter se: in some 
