280 PROCEEDINGS OF THE NATIONAL MUSEUM Vou. 113 
between the eyes cannot be used to separate Synertha from the rest 
of the genus Simcronyz. ‘Therefore, S. imbricatus has been placed in 
the subgenus which it most closely resembles, Pseudosmicronyz, and 
Synertha becomes a synonym of that subgenus. 
Key to the Species Groups of Subgenus Pseudosmicronyx ° 
1. Elytra distinctly inflated; prothorax strongly rounded at sides (fig. 26). 
ovipennis group (p. 305) 
Elytra not inflated (although convex in some eee ; iclep only moder- 
ately or slightly rounded at sides . .. . oat CET BE? 
2. Rostra of both sexes squamose from base to near apex; pronionde subcylin- 
drical; elytra elongate, subparallel at sides. . imbricatus group (p. 302) 
Rostrum of the female distinctly glabrous before antennal insertions; pro- 
thorax rounded at sides or, if nearly subcylindrical, the elytra convex, not 
elongate... . al 1 eS 
Form elongate; elyeen onlya slichtly pronder than Parot nora am base; scales 
(except setiform scales) unicolorous; punctures of prothorax roudede 
evenly spaced, not confluent; propygidium of male bearing long setae on 
posterior margin (fig. 38)... .. . . . resplendens group (p. 319) 
Form more robust; elytra much Brendes than prothorax at base (as in figs. 6 
and 23); if scales are unicolorous, punctures of prothorax are confluent or 
in rows running anterolaterally from acai gaia of male without 
long setae... . a. Sebheet yom 
4. Seales of prothorax Baal alvin light diene eray, Seon tor a 5 Aokawal stripe 
of brownish scales on elytra Le in some specimens) and brownish scales 
on disk of prothorax. . . 2 . . .griseus group (p. 314) 
Seales of prothorax and elytra never gray at ibroger as above. (a. 6 ase 
5. Humeri very prominent, elytra rather convex; peers nearly subcylin- 
drical, slightly narrowed at apex and bearing three longitudinal patches 
of white scales. ... . . . . . abnormis group (p. 312) 
Humeri distinct but not Prominent Gis. 6, 23); elytra not very convex, 
prothorax not nearly subcylindrical, distinctly narrowed near apex (figs. 
6, 23), bearing no more than one patch of white scales . LO RS 
6. Third tarsal segment much broader than first two; rostrum not roughly 
punctate behind antennal insertions; elytral declivities distinct (figs. 6, 23); 
punctures of prothorax confluent or partly confluent (fig. 23) in all but 
S. utilis Buchanan and S. commiztus Dietz . . corniculatus group (p. 280) 
Third tarsal segment only slightly broader than first two; elytral declivities 
indistinct; rostrum roughly punctate behind antennal insertions; punctures 
of prothorax in anterolateral rows running from midline, but not confluent. 
obtectus group (p. 298) 
Co 
SMICRONYX CORNICULATUS GROUP 
Description: Body elongate-ovate, moderately stout. Rostrum 
moderately curved in both sexes, much more smooth and shining 
6 Although the grouping of species in this study is based on both external and genitalic characters, this 
key is based only on external characters (as are the other keys). If the reader has difficulty in using this 
key, he may find a comparison of the genitalia with the descriptions and figures of those structures helpful 
in determining the groups. 
