132 HETEROMERA. 
2. Sisenes boops. (Tab. VI. fig. 10, 3.) 
Elongate, opaque, the head, scutellum, and elytra dark violaceous, the prothorax reddish-yellow slightly stained 
with violaceous along the middle of the disc, the oral organs fusco-testaceous ; the head in front and the 
prothorax thickly clothed with rather long yellowish, the elytra with fine cinereous, pubescence. Head 
densely and rather coarsely punctured, somewhat concave between the eyes, the latter ( ¢ ) large, convex, 
_ very prominent, and rather deeply emarginate, the canthus smooth ; antennw ( ¢ ) stout, very long, reaching 
to the end of the elytra, slightly tapering outwardly, black, the two basal joints testaceous beneath, joint 2 
one-third the length of 3, 3 and 4 subequal, 5-11 very elongate ; prothorax a little broader than long, 
the sides rounded in front, constricted behind, and with an oblique groove about the middle running 
inwards, the disc obsoletely canaliculate, with a large and broad excavation in front extending nearly to 
the sides, and largely depressed in the middle behind, the depression limited on each side by a sinuous 
groove and at the base by a deeper transverse one which extends to the lateral margin, the space between 
the frontal and basal depressions raised on each side into a transverse sinuous callus which meets the 
opposite one in the middle of the disc, the surface densely and finely punctured, the base with prominent 
margin, the hind angles acute; elytra moderately long, broadest at the base, flattened on the disc, the 
sides rectilinear, the apices obtuse, the surface scabrous and with finely impressed series of double lines on 
the disc ; beneath thickly clothed with long cinereous pubescence, violaceous, the sides and front of the pro- 
thorax reddish-yellow, finely and very densely punctured ; legs rather slender, black, and thickly clothed 
with ashy pubescence ; joints 1-4 of the front and middle tarsi and 3 of the hind tarsi tomentose beneath. 
3. Fifth ventral segment deeply triangularly emarginate; the sixth with the lateral lobes large and spoon- 
shaped, these resting one over the other in repose and protruding beyond the fifth, 
Length 9 millim. (¢.) 
Hab. Mexico, Chilpancingo in Guerrero 4600 feet (ZH. H. Smith). 
One male example. This species is not closely allied to any other here enumerated. 
The large eyes, deeply excavate and nodose thorax, long antenne, and other particulars 
described above distinguish it at a glance. 
b. Tarsi with joints 2-4 of the front and middle pairs and 3 of the hind pair tomentose 
beneath ; eyes smaller, feebly emarginate ; elytra with fine coste. 
3. Sisenes varians. (Tab. VI. fig. 1], 4.) 
Elongate, opaque, thickly pubescent, flavo- or reddish-testaceous, the prothorax often of a more orange tint ; 
the head in great part (except the middle of the base and in front) and the eyes piceous or black, the 
labrum, tips of the mandibles, and middle of the epistoma piceous; the prothorax in some examples 
stained with piceous at the sides; the scutellum flavous; the elytra with the apical third, and often a 
large elongate-triangular scutellar patch as well, piceous, in one example entirely of this colour. Head 
very densely and finely punctured, the eyes rather small and feebly emarginate; antenne black, of a 
browner tint towards the apex, moderately long, not very slender, tapering a little outwardly, joint 2 one- 
third of the length of 3, 3 and the following joints subequal; prothorax rather longer than broad, the 
apex rounded and somewhat extended forwards in the middle, the sides rounded in front and converging 
behind, the base grooved within and with prominent margin, the hind angles acute, the dise with a deep 
oblique excavation on each side about the middle, broadly and shallowly transversely depressed in front, 
transversely depressed in the middle before the base, and with a more or less distinct median ridge, the 
surface densely and finely punctured ; elytra moderately long, broadest at the base, subparallel, very 
densely and finely punctured, and with two coste on the disc and one at the sides, the two outer ones 
nearly reaching the apex and the inner one extending to a little beyond the middle, the suture also 
raised ; beneath thickly pubescent, testaceous, the sides of the prothorax, metasternum, and venter often 
much stained with piceous, densely and minutely punctured; legs slender, piceous, the basal half or 
two-thirds of the femora testaceous ; joints 2-4 of the front and middle tarsi and 3 of the hind tarsi 
tomentose beneath. , 
