Original description: Arcyptera coreana
♂♀. Frontal ridge nearly
parallel-sided, in the middle slightly furrowed, in profile slightly
convex. Fastigium of vertex somewhat oblique, not longer than broad,
obtusely triangular, with an indistinct median carinu1a and very
shallow fastigial foveolae. Eyes oval, in profile the front margin
nearly straight, with more or less pointed upper and lower angles.
Antennae much longer than head and pronotum united.
with the front margin straight and hind margin obtusely angulate.
Median keel well developed, in profile feebly convex in the prozona.
Lateral margins rounded, incurved in the middle of the prozona,
gradually divergent hindwards and less so forwards. Typical sulcus
just behind the middle, two front sulci more or less distinct but
widely interrupted by the median keel. Lateral lobes of pronotum
subquadrate, broader than long, with the margins almost all straight
and hind angle nearly right angled.
broad, separated by an interspace which in the male is about ha1f
as wide as one of the lobes and a little broader than its own length,
but in the female narrower. Metasternal lobes round, in the male
their inner angles touching each other, but in the female the interspace
is triangular and divergent hindwards.
long, tergites with a median keel which is not developed in 3 posterior
tergites of male. Last tergite in male strongly concave behind,
but in female very slightly so. Supra-anal plate rather long, narrowly
triangularly prolonged behind. Cerci of male very slightly curved,
hardly reaching the end of supra-anal plate; of female very short,
conical. Subgenital plate of male short, conical.
with rounded apex; in male a little beyond the hind femur, with
the humeral area moderately inflated and broadest in the middle;
in female not reaching the anal end, very narrow. Wings not reaching
the apex of elytra.
General coloration dark brownish.
Antennae reddish yellow, with the apex dark colored. Fastigium of
vertex brownish at the front margin. Upper portion of pronotal lateral
lobes with an ill-defined upper hand dark-colored and two large
spots yellowish. Hind femora with 3 black spots on the upper surface,
of which the apical one expanded to the inner surface; hind knee
black; hind tibiae reddish. with a yellowish subbasal ring. Elytra
of male broadly blackish at the apical part; of female with rather
numerous blackish spots on the discoidal area, without blackish
apical part. Wings deeply infuscated, but anal area rather slightly
especially in female.
Body length ♂ 28-30, ♀ 36;
pronotum ♂ 5.5-6, ♀ 7; elytra ♂ 23-25, ♀ 22; hind femora ♂
17-18, ♀ 21 ㎜.
This is easily distinguished from
fusca Pall. or fusca albogeniculata Ikon., by no lateral
keels of pronotum (in the female more or less indistinctly developed)
and narrow fastigial foveolae, as well as by more or less indistinctly
furrowed facial ridge. Hab. Corea from North to South.