| Genus List |
Head: slightly wider than long; vertex sulcate; surface between
antennae elevated into longitudinal ridge reaching base of clypeus;
interocular width variable; clypeus large, surface sculpturing
rugged to rugose; labrum prominent, broader than long; outer margin
of each mandible rather broadly and evenly arcuate; eyes convex
and elongate-oval. Antennae: segment I always incrassate
and inserted dorsally before midpoint of eye. Pronotum: broader
than head; wider than long; side margins bisinuate, angulate at
middle; dorsum transversely convex; slightly depressed posteriorly
with ante-scutellar transverse ridge; surface generally coarsely
foveo-punctate; interstices usually cristate; with smooth
baso-lateral torulose present on either side of posterior
depression; torulose of variable size and color. Elytra: elongate-oval;
apices cojointly rounded, deeply subquadrate-emarginate at
suture; side and apical margins serrulate; each elytron with 10
and at extreme base 11 rows of punctures. Legs: last tarsal
segment produced between bases of claws into a narrow triangular,
truncate process. Venter: abdomen sparsely micropunctate; apex
of 5th sternum slightly emarginate; generally 5th sternum of female
with small irregular patch of setae on either side of central
elevation and in males the patch of setae is scarcely perceptible.
Male genitalia: aedeagus from moderately to heavily sclerotized
and showing considerable curvature below; basal foramen fairly
large, with posterior ventral border prominent and subtriangular;
medial lobe tapering dorsally; flagellum stout, broad basally
and gradually tapering into an acute posterior end; spiculum generally
U-shaped.
Key to the Xenochalepus known from La Selva
1. Elytra entirely black 2
Elytra reddish-yellow with suture and/or apices black Xenochalepus amplipennis
2. Side margins of pronotum regularly arcuate Xenochalepus erythroderus
Side margins of pronotum straight and divergent base to middle,
then converging Xenochalepus rufithorax
Species known from La Selva:
Xenochalepus amplipennis (Baly)
Xenochalepus erythroderus (Chapuis)
Xenochalepus rufithorax (Baly)
Page authors:
C. L. Staines, 3302 Decker Place, Edgewater MD 21037. Staines.Charles@NMNH.SI.EDU
John T. Longino, The Evergreen State College, Olympia WA 98505 USA. longinoj@evergreen.edu