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LAWRENCE S. DILLON AND ELIZABETH S. DILLON 121
slightly posteriorly. Pronotum transverse, sides only slightly oblique, nearly
straight, apex feebly narrower than base; disk with the median tubercle subtriangu­
lar, confined to ba.sal half, often wanting, each side broadly tumid, tumescence more
or less distinctly subdivided by an oblique impression, sometimes entire disk feebly
tumid and nearly smooth; apical transverse sulcus distinct, interrupted at middle,
basal one deeply arcuate, broad, distinct, more shallow laterally. Scutellum trans­
verse; sides straight, oblique; apex feebly arcuate, notched at middle. Eiytra with
sides nearly straight, feebly attenuate to apic.es, each of which is narrowly rounded ;
,disk basally broad tumid, twnescence convex, slightly prominent, entire ba8!'l1 third
covered with numerous, rather coarse, well-spaced punctures, some forming a dis­
tinct row along suture, rest irregularly scattered, apical half nearly smooth; hum­
erus oblique, prominent, with an obtuse t11bercle, followed by a distinct carina
which rUlls along side of disk to behind middle; sides behind humerus coarsely,
nther densely punctate, punctures evallcent posteriorly, tenninnting at middle.
Prostermlm simple. Procoxae globose, anteriorly strongly uncate; femora all cla­
vate, rohust, profemora a little morc robust basally, not rugose; mctntibiae slight.ly
exp..1nded apically. Fifth sternite one-quarter longer than fourth, apex broadly
emarginate. Antennae nearly one-half longer t·han body, with a long fringe beneath
on third a.nd fourth segments, rest with sparse, but long, fringing bairs; scape
mther robust, gradually clavate from middle, bcneath !tt base coarsely rugose; third
segment bisinuate, apical curve feeble; eleventh segment longer than tenth, hooked
at apex.
FEMALE. liead with front less deeply concave between antennal tubercles,
which are less elevated and anned .with only a short, inconspicuous tooth; procoxal
tubercle not acute, feebly prominent ; metatibiae gradually expanded to apex; fifth
stemite about onc-quarter longer than fourth, linearly impressed at middle, apex
feebly arcuate; antennae slightly longer than body; scapc less clavate.
LENGTH 11-16 mm.; width 4.2-6.5 rom.
'l'ype locality.-Cayenne (barii) j Ega (lignicolor).
Distribution.-The Guianas and Peru.
FRENCH GUIANA: 4 t, ; Cayenne; [1 t-A.N.8.P.; 3 $, 2-M.C.Z.J .
BIUT15H GUIANA: t; Kartabo, Bartica District, May 9, 1921; [C.M.].
PERU : it; Rio Santiago, Nov. 21, 1928; [A.M.N.H.]. 5; Mozobamoo, Dep't Saro
Yastin, Nov. Zl, 1936; (F. Woytkowski); [L. Lacey] .
Re11tarks.-Thre is nothing in Bates' description of lignicolor
which will serve to distinguish it from barii.
STERNYCHA Dillon and Dillon, gen. nov.
Distinguished from all other genera of the tribe by the presence
of a large, distinct tubercle on mesosternum anteriorly. Some­
what related to Hesycha in farro, but is more robust; elytra less
attenuate ; and antennae in male only slightly longer than body,
the sixth, eighth, and tenth segments with basal two-thirds pale.