70 HETEROMERA. 
the suture before the apex, the surface flattened, with scattered shallow impressions and no trace of tubercles 
or ridges ; antenne with intermediate joints a little longer than broad; trochantin distinct. 
Length 8-9 millim. 
Hab. Mexico, Cuernavaca (coll. Ff. Bates). 
Two examples. 
ZAMOLXIS. 
Labrum prominent, clasped by the mandibles, transverse, emarginate in front; mentum rather small, trans- 
verse, rounded at the sides in front, feebly emarginate, closely fitting into and filling up the gular 
cavities ; side-pieces of the submentum produced into a long blunt tooth on each side; ligula entirely 
concealed; last joint of maxillary palpi broadly triangular, subsecuriform; antenne with the third 
joint twice the length of the second, fourth to ninth decreasing in length, obconic, tenth broad, subtri- 
angular, eleventh small, rounded at apex; intermediate coxal cavities open externally, trochantin promi- 
nent; prosternum declivous behind, rounded; intercoxal process broadly rounded in front; epipleure 
suddenly narrowed at each end and with a short fold at the apex; tarsi with long stiff hairs beneath, not 
sulcate; eyes transverse, short; thorax strongly dilated at the sides, hind angles quite obsolete; elytra 
rounded at the sides, costate; anterior tibiz with a strong tooth at outer apical angle; scutellum subtri- 
angular, coarsely punctured. 
Founded on a single species from Mexico. Allied to Asida, and, like Poliorcetes, 
difficult to separate therefrom by good structural characters, though at first sight 
appearing very different. 
1. Zamolxis dilatatus. (Tab. II. fig. 24.) 
Oblong ovate, convex, somewhat depressed above, black, slightly shining. Head broad, transversely impressed 
in front, the lateral margins a little swollen and prominent, very coarsely punctured ; prothorax transverse, 
much dilated at the sides, widest a little bebind the middle, strongly narrowed behind, the hind angles 
obsolete, narrowed in front, and the anterior angles rounded and not produced or prominent, anterior 
margin slightly emarginate, base slightly rounded, the expanded lateral margins a little raised and strongly 
crenulate, the disc with course scattered punctures, the sides coarsely rugulose ; elytra somewhat depressed, 
rounded at the sides, gradually widened from the base to beyond the middle, the apex a little produced, 
the humeral angles obtuse, the base emarginate, narrower than the thorax at the base, with three smooth 
ridges—a dorsal ridge distinct towards the base, a prominent ridge confluent with the first at the base and 
parallel with and confluent before the apex with the third or marginal ridge, the suture a little raised, and 
the surface with scattered coarse shallow rounded impressions. Beneath shining, coarsely punctured, the 
epipleuree and ventral segments sparingly, the rest closely; mentum with some very coarse rounded 
impressions. 
Length 17 millim. 
Hab. Mexico, Puebla (Sallé). 
Two examples. 
POLIORCETES. 
Mentum placed upon a broad peduncle, transverse, triangularly emarginate, nearly filling the gular cavities, 
not contiguous to the mandibles, the sides rounded in front; side-pieces of submentum prominent and 
produced into a broad triangular tooth on each side; last joint of the maxillary palpi securiform ; 
labrum prominent and clasped by the mandibles; ligula almost hidden; antenne with third joint 
more than twice as long as second, fourth to eighth decreasing in length, obconic, ninth larger and 
subtriangular, tenth transverse, very broad, eleventh small and rounded at the apex; prothorax trans- 
verse, anterior angles prominent; elytra flattened, swollen behind, with regular finely denticulated 
ridges; tarsi sulcate, and with fine hairs beneath; intercoxal process broadly rounded in front, slightly 
