tancrei Staudinger (Amur to Japan).
The species are smaller than in preceding genera, with rather narrow,
apically produced forewings that have a distinctive pale discal spot and a
series of oblique, slightly curved, crenulate fasciae. The abdomen is
variegated with diamond-shaped markings. In the male genitalia the uncus
is broad, short, apically triangular; the gnathus is apically bifid; the
aedeagus has an apical tooth. The harpe on the valve is large, with a
spine-like ventral process and an irregularly lobed dorsal one.
The larva is typical of the Sphinginae. The pupal tongue case is not free
(Bell & Scott, 1937).
(1983) recorded Japanese species from genera in the Oleaceae
The genus contains up to nine species, most ranging from Japan and the
Amur Region to Asia Minor (D'Abrera, 1986: 46), D. inexacta Walker
the Himalaya and China, and the montane Sundanian species described
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