Original description: Nemobius
ohmachii Shiraki 1930
Moderate in size, tawny brown, the
sides being rather darker, elytra with very inconspicuous pale irregular
markings. ♂. Head scarcely wider than pronotum,
occiput rounded, forehead a little sloping, frontal rostrum a little
wider than the first antennal joint, bristle-like hairs black; face
slightly oblique, strongly shining; palpi light brown, the last
2 joints being pale yellowish; apical joint of maxillary palpi blackish
tipped, distinctly longer than the 3rd and nearly twice as long
as the 4th, moderately expanded at apex. Antennae light brownish;
eyes oval; ocelli yellowish, rather large, disposed in a low-triangle. Pronotum
rather transverse, furnished with black bristle-like hairs; anterior
and posterior margins straight; lateral lobes dark brown, the inferior
margin being paler, the later nearly horizontal, the anterior and
posterior angles rounded. Abdomen rather short, dark
brown with paler ventral side; supra-anal plate triangular, very
short; subgenital plate a little shorter than long, the posterior
margin very slightly emarginate in the middle; tergite just before
supra-anal plate with two parallel bristle-like hairs. Legs
concolorous, tawny yellow, posterior femora darker on the dorsal
half. Anterior tibiae slightly compressed, provided at the external
face only with a large oblong tympanum; metatarsi as long as two
followings together. Intermediate tibiae and metatarsi narrower
and a little longer than the anterior ones. Posterior femora moderate
in length, very inconspicuously marbled with reddish brown at the
external side; tibiae distinctly shorter than femora, armed with
4 spines on each margin; supero-internal spur longer than the remainings,
intermediate ones on both sides equal in length, inferior spurs
very short of which the internal one is shorter than the external
spur; metatarsi longer than the two following joints together, furnished
with 4 spines on the internal margin and only 2 on the external;
each metatarsal spur furnished with two spines. Elytra
reaching to the abdominal end, rounded at apex; speculum rather
small, as long as wide, presenting no cell but having a short transversely
oblique veinlet about the centre only; 3 cords, the two external
of which are much curved, the first one sending a branch to the
internal angle of speculum; diagonal vein long, nearly straight;
oblique vein only one, very slightly curved inwards; apical field
very much reduced, inconspicuously reticulate; lateral field dark
brown, with 4 parallel veins. Wings wanting. ♀.
A little longer than the male. Elytra leaving three last abdominal
tergites free, more or less rounded at apex; longitudinal veins
4 on the dorsal field; lateral field dark castaneous, presenting
4 longitudinal veins. Supra-anal plate transverse, not triangular;
subgenital plate very broad, about twice as wide as long, the posterior
margin conspicuously emarginated in the middle; ovipositor very
short, slightly curved upwards, about 2/3 as long as the posterior
tibiae, apical valves comparatively long, of which the superior
ones are very minutely serrate, having an apical hook. Length:
Body ♂ 8, ♀ 8.5; pronotum ♂ 1.7, ♀ 1.6; elytra ♂ 4.5, ♀ 4;
post. femora ♂ 5, ♀ 5.2; post tibiae ♂ 4, ♀ 4.4; ovipositor
3 ㎜. Hab.: Japan-Tokyo. Types in
the Entomological Museum of Government Research Institute, Taihoku,
Formosa.
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