Decasticha

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; antennæ 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 striæ entire; legs rather slender; tibiæ without conspicuous denticles on their inner edge, 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.

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 Exophthalmus; and the non-squamose nasal plate, the less abruptly bowed anterior tibiæ, 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.