180 _HETEROMERA. 
South-American origin), all of which have confusedly punctured elytra, without any 
indication of rows of coarser-impressions. In A. imermis the head appears to be 
similarly formed, and unarmed in both sexes. 
12. Arrhenoplita cioides. (Tab. VIII. fig. 9, 3.) 
Elongate ovate, moderately convex, testaceous, finely pubescent, slightly shining. Head in the male finely 
and sparingly punctured, the epistoma rather long and narrow and with a small triangular prominence on 
each side in front, the vertex armed with two long stout horns (these project forwards in a line with the- 
‘body, and their apices are thinner, slightly pointed, and curved downwards), the space between the horns . 
transversely raised, the space immediately behind them broadly and deeply excavate, the front (if viewed 
sideways) almost vertical; eyes small, oblique; antennz with the seven outer joints widened and more or 
less triangular, the sixth to the tenth joints transverse, the fourth joint wider than the third ; .prothorax 
transverse, widest about the middle, the apex almost straight, the anterior angles rounded, the base 
bisinuate, the sides slightly rounded, the surface very closely and not very finely punctured; elytra the 
width of the prothorax, but more confusedly, more shallowly, and not so closely punctured; legs and 
antenne testaceous. 
Length 23 millim. (¢.) 
Hab. Panama, Caldera in Chiriqui (Champion). 
One example. This insect superficially resembles a species of Cis. 
13. Arrhenoplita pentaphylloides. 
Ovate, moderately convex, testaceous, finely pubescent, slightly shining. Head very finely and closely punc- 
tured, the epistoma well defined; in the male the vertex armed with two stout conical tubercles, and the 
space behind the tubercles transversely and deeply excavate; eyes small, feebly emarginate; antenns. 
gradually widening outwardly, the six outer joints of about the same form and width as in-the allied 
species ; prothorax strongly transverse, the sides slightly rounded, widest a little before the base, the apex. 
not deeply emarginate, the anterior angles rounded, the base bisinuate, the surface very closely and finely 
punctured; elytra more confusedly and not so closely punctured and rather more shining than the pro- 
thorax ; legs and antenn testaceous; beneath shining, finely and rather closely punctured. 
Length 21-24 millim. (¢ 92.) 
Hab. Guatemata, Cerro Zunil, Capetillo (Champion). 
Numerous examples. This insect resembles the European Pentaphyllus testaceus,: 
Hellw.; the eyes, however, though small, are feebly emarginate, and the antenne do. 
not possess a loose five-jointed club, but have the joints gradually widened from the: 
base. The eyes in this species and in A. cioides are much smaller and less coarsely 
facetted than in A. bituberculata and A. inermis. All these small. forms, with con- 
fusedly punctured elytra, are, however, very nearly allied in general structure to the 
other and larger species with regular rows of elytral punctures. 
SAPTINE. 
Last joint of the maxillary palpi subtriangular; antenne gradually widening from the base, the four basal. 
joints slender, the fourth joint but little shorter and scarcely wider than the third, the fifth and sixth 
joints wider and subtriangular, the seventh distinctly broader than the sixth, the seventh to the tenth 
decreasing in length, the seventh and eighth subtriangular, the ninth and tenth transverse, the eleventh 
much longer than the tenth and bluntly rounded at the apex; head short, deeply sunk into the prothorax,,. 
