EUSTALES.—DECASTICHA. 273 
the head, the flattened upper portion parallel-sided, the head with a short, fine, longitudinal groove 
between the eyes and a smooth space behind them; eyes oval, large, somewhat depressed ; antenne 
rather slender, joints 1 and 2 of the funiculus subequal in length, the others shorter and obconic. Pro- 
thorax gradually narrowed anteriorly, the sides parallel behind, the base deeply bisinuate ; rugulosely 
punctate. Elytra narrowing from about the middle, bisinuate at the base, produced at the apex, the 
apices each armed with a prominent tooth at the sutural angle, the humeri obtuse and somewhat tumid; 
finely punctate-striate, the interstices rugulose, 1 (suture), 3, and 7 more or less raised. First ventral 
segment hollowed down the middle. Anterior tibia strongly, and the intermediate pair feebly, unguiculate; 
the anterior pair (fig. 206) stout, abruptly bowed, closely denticulate, and ciliate within. 
Length 83, breadth 23 millim. 
Hab. GuateMaLa, Zapote (Champion). 
One specimen. Not unlike the Brazilian £. thunbergi, Dalm. (=pentachordius, 
Germ.), but less elongate, the rostrum, antenne, and prothorax shorter, the scales 
larger and less densely packed, the elytra each armed witha strong tooth at the sutural 
angle. ‘The anterior tibiz are similarly bowed in the two species. 
DECASTICHA, gen. nov. 
Rostrum a little longer than broad, the upper portion obliquely divergent on each side of the triangular smooth 
nasal plate, the scrobes lateral, deep, curved, and descending ; eyes not strictly lateral, moderately large, 
rounded ; antenne rather slender; prothorax feebly bisinuate at the base; scutellum well-developed ; 
elytra much wider than the prothorax, separately rounded at the base, with the humeri moderately 
prominent and oblique in front, 10-striate, the outer stric entire; legs rather slender; tibize without 
conspicuous denticles on their inner cdge, the anterior and intermediate pairs unguiculate, the posterior 
pair laminate at the apex and with the glabrous articular surface short and cavernous ; body winged, 
oblong or elongate, squamose. 
Type, D. subocellata. 
The four Costa Rican or Panama insects referred to this genus are closely related 
inter se, though not very similar in general appearance. ‘The 10-striate elytra 
separates them from Lxophthalmus; and the non-squamose nasal plate, the less 
abruptly bowed anterior tibie, the rounded eyes, the non-lobate base of the elytra, 
&c., distinguish them from Eustales (type Curculio thunbergi, Dalm.). D. subocellata 
superficially resembles Exophthalmus obsoletus (Oliv.) and D. decemguttata is marked 
like E. jekelianus (White). Decasticha will include at least one undescribed Colombian 
form (Eustales gemmeus, Klug, in litt.) in the British Museum. 
1. Decasticha subocellata, sp.n. (Tab. XII. fig. 21, 2.) 
Q. Elongate, black, densely clothed with whitish scales, the prothorax and elytra confusedly variegate on the 
disc with fuscous scales, those on the elytra enclosing numerous small and two larger (longitudinally 
placed, transverse or rounded) whitish spots, the flanks of the elytra with a dark-edged spot at about the 
basal fourth; the surface also set with minute, scattered, decumbent setee. Head and rostrum densely, 
finely punctate, the rostrum depressed down the middle to the feeble inter-antennal ridge and finely 
canaliculate to the small inter-ocular fovea; antenne rather slender, the scape about reaching the 
posterior margin of the eyes, the latter rounded. Prothorax broader than long, bisinuate at the base, 
obliquely narrowed anteriorly ; densely, finely punctate, and with some coarse scattered punctures along 
the sides, the disc incompletely suleate down the middle and strongly, arcuately depressed at the base. 
Scutellum subquadrate. Elytra one-half wider than the prothorax, subparallel in their basal half, 
BIOL. CENTR.-AMER., Coleopt., Vol. LV. Pt. 38, October 1911. QNN 
