Type species: imaon Cramer.
This genus and the next share with Ceryx Wallengren the reduction
of veins arising from the hindwing cell to two apart from Rs (Fig. 5), and the
presence of only one transparent patch in the forewing space posterior to CuA2.
They are defined on features of the male genitalia. These are robust in Syntomoides,
the tegumen broadened into two massive shoulders on which the uncus is
equally broadly based (the darkly sclerotised dorsal margin is an extension of
the uncus base). The valves are short, simple, rather rounded. The vinculum is
very broad, giving rise to a pair of apodemes rather than a central saccus. The
female genitalia have a very narrow eighth segment; there is a single signum in
the bursa as in Caeneressa and the next genus.
The genus contains only the type species.
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