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144 THE TRIBE ONCIDERINI
rather dense medially ; genae elongate, punctation as on front; eye with lower lobe
broadly oblong·ovate, short, subequal to gena in height; antenna! tubercles robust,
prominent, slightly separated, unarmed. Pronotum transverse, one and two-fifths
times as wide as long, sides unarmed, excavated medially, thence arcuately expanded
to apex which is slightly narrower than base ; apical and basal transverse sulci ir­
regular, distinct, the basal one continuous with the very abbreviated, feeble, lateral
oblique oncs ; disk with five tubercles, three at middle arranged on a tumid trinngle,
the median one of which is feeble, the anterior ones prominent, subglobose, the re­
maining two small, near sides; entire surface covered sparsely with fine punctures.
Scutellum transverse, nearly semicircular, the apex feebly truncate. Elytra. with
sides slightly expanded behind middle, then nreuately narrowed to apices, which
are separately rounded ; basal gibbosity broad, feebly elevated, followed by an
oblique, broad, shallow impression, entire basal half coarsely, not densely punctate,
behind middle to apex punctures finer, less strongly impressed; humeri prominent,
anterior margin straight, oblique, angle obtuse, with only a feeblc tuberele. Pro­
sternum simple, narrow, widened basally; mesosternal process subquadrate, feebly
expanded posteriorly, apex retusc; fifth sternite one-half longer than fourth, apex
broadly rounded, with an indistinct, triangular, shallow impression medially near
tip. Procoxac subglobose, unarmed anteriorly; femora rather slender, aligbtly
clavate, profcmora not rugose. Antennae very littlc longer than body, four prox­
imal segments very sparsely fimbriate beneath; scape nearly attaining middle of
pranotum, clavate on apical two-fifths, not rugose basally; third segment sinuous,
basal curve stronger, only one-fifth longer than first; fourth equal to first, rest
gradually shorter.
LENGTH 14.5 Illlll.;
width 5B mm.
Holotype.-Female; Santarem, Brazil ; [C.M.].
ESONIUS Dillon and Dillon, gen. nov.
Closely related to llfida1nus but having front slightly narrowed
between and beow eyes ; eyes with lower lobes oblong-ovate, large,
distinctly taller than gena ; pronotum subcylindrical, not excavated
on sides; elytra granulate-punctate at base, humeri less elevated,
anterior margin more strongly arcuate; procoxae distinctly tuber­
culate in male, tubercle sometimes terminating in an uncus ; an·
tennae one and one-half times body length in male, slight1y longer
than body in female, scape more gradually clavate, third segment
only slightly bisinuate.
Moderate--sized, elongate-ovate, robust. Head with front elongate, vertical,
slightly narrowed between nnd below eyes ; genae elongate, vertical; eye with lower
lobe elongate, oblong·ovate, distintltiy taller than gena; antennal tubercles prominent,
distinctly separated, apex in male with a short, robust tooth, in female min­
utely anned. Pronotum transverse, subcylindrical, narrower at ape."{ than at base,
sides with a small tubercle, before and behind which is a strong depression; disk
wit-h five tubercles. Scutellum slighUy transverse. Elytra gradually attenuate apic-