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Original description: Podisma
morii Bey-Bienko 1931
Belonging to the apterous
group of the genus but not closely related to any known species.
Body
relatively slender, feebly pilose. Head with a sloping vertex; eyes
rounded-oval, a little longer than broad, separated above by a distance
subequal to the width of frontal costa; the later is fully developed,
with quite parallel margins and with a strong and deep sulcus; face
considerably reclinate; facial carinae very sharp; practically straight.
(Antennae brocken off).
Pronotum cylindrical, without
lateral keels; median keel thin but distinct on the whole length
of the pronotum, and specially in the metazona; typical sulcus well
developed; prozona three times as long as the metazona, with two
distinct transverse sulci; second sulcus placed on the middle part
of the pronotum; anterior and hind margins truncate, with very feeble
median excision; lateral lobes vertical, with very strong and practically
straight vertical sulcus, placed a little before the middle part
of a lobe. Prosternum with strongly pointed, conically produced
spine. Meso- and metanotum with very distinct lateral keels. MesosternaI
lobes transverse, broader than interspace between them; Interspace
a little broader than long; metasternal lobes very much approached,
interspace between them elongated. Elytra and wings completely absent.
Anterior and middle femora incrassate; hind femora relatively slender,
lower margin of genicular lobes not straight, nor rounded but somewhat
excised. Hind tibiae with 13 outer and 11 inner spines; subequal
pair of internal spurs nearly two times as long as the subequal
pair of external spurs. Arolia of the anterior and middle legs strongly
developed, larger than claws and broader than the apex of third
tarsal joint (hind tarsus brocken off).
Abdomen long,
somewhat clavate at the apex; the sides of the first segment with
a small, rudimentary but distinct tympanum; subgenital plate short,
bearing a small pointed tubercle on the apex; furcula developed,
its lobes small, interspace between them large; supraanal plate
triangular, practically as broad as long, apex somewhat less than
90°; basal half of the plate near lateral margins with strong
and almost vertically produced triangular projections (tubercles);
basal impression (behind furcula) triangular somewhat sharpened
on the apex, somewhat broader in basal part, than interspace between
the lobes of the furcula; lateral margins of the basal impression
somewhat raised, keel-shaped; apical half of the supraanal plate
with a somewhat elevated and elongated median platform between the
apex of the basal triangle and the apex of the supraanal plate;
median part of this platform with not deep longitudinal sulcus.
Cerci relatively short, very broadened at the base and rounded pointed
apically; basal part more than two times as broad as the middle
part of the cercus; hind (lower) margin of the cercus practically
straight, anterior (upper) rounded, obtusely triangular; apices
of the cerci somewhat flattened, not reaching the apex of the supraanal
plate.
General coloration pale-brownish; lateral
side of the body with relatively narrow black stripe beginning from
eyes and reaching the basal part of the cerci. Lower half of the
lateral lobes not blackened, pa1e-brownish. Hind femora with indistinct
dark stripes, practically unicolorous, pale-yellow, except blackened
genicular lobes; hind tibiae pale yellow, with blackened basal part
near the knee and with black spinulae. Supraanal plate black, with
pale-brownish basal triangular impression and apical elongated platform;
cerci pale-brownish, with a black apical third.
Length
of body ♂, 24.2 ㎜; pronotum, 4.3; hind femora, 11.8.
Described
after a single male type specimen from the mountain Peikto, Northern
Korea (T. Mori).
This interesting species differs
strongly from all other apterous species of Podisma in its large
dimensions and in the peculiar structure of the supraanal plate.
The species is also well characterised by the presence of a small
rudimentary tympanum which shows that the species belongs to the
group P. salamandra Fisch., P. baldensis Krauss, P.
glacialis Scudder (Northern America), etc.
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