Paromalus viaticus Lewis, 1892: 33 [Japan: Nikkô, Oyama, Kashiwagi, Nara, Kumamoto, and Yuyama, chiefly in the warmer districts of the islands].
Platylomalus viaticus: Kryzhanovskij and Reichardt, 1976: 275; Mazur, 1984: 136; Hisamatsu, 1985: 224 [photo].
Japanese name: Tsuya-chibi-hirata-emma-mushi.
Paromalus viaticus Lewis, 1892, 33.
Platylomalus viaticus: Ohara, 1994, 187.
Original description. "Oblongo-ovalis, depressiusculus, niger, nitidus supra punctulatus; ----- stria transversali nulla; metasterno leviter et sparse ---- ; propygidio pygidioque sublaevibus.
Oblong-oval, somewhat depressed, black, legs reddish; the head evenly
punctured, a little prominent and obtusely angulate over the eyes, stria
strong laterally, arched anteriorly, sinuous before the eyes, forehead flattish;
the thorax bisinuate behind the head, punctured finely behind the neck and
on the disk, punctures much larger at the sides and along the base, no scutellar
fovea; the elytra are punctured like the sides of the thorax, sutural margin
narrowly smooth, suture feebly raised before the apex to the middle of the
dorsum, epipleural stria continues round the sutural angle, dorsal striae
indistinct; the propygidium evenly, not closely punctured; pygidium in the
female evenly punctulate, in the male punctulate except at the apex, which
is transversely rough and very densely punctured; the prosternum, lobe sparsely
but distinctly punctate, keel bistriate, stria feebly sinuous, bent at both
ends, but not connected at either; the mesosternum without a transverse
stria, suture apparent and like the metasternum, sparsely and finely punctured,
especially in the median area; anterior tibiae 4-dentata."
Description. Male and female. Body oblong, black and shining; femora, tarsi, mouthparts and antennae rufopiceous. Body length, PPL, male, 1.64 - 1.91 mm (1.79 ± 0.03, n=9), female, 1.49 - 1.77 mm (1.63 ± 0.06, n=5); PEL, male, 1.52 - 1.72 mm (1.64 ± 0.02, n=9), female, 1.45 - 1.64 mm (1.54 ± 0.03, n=4). Width, male, 0.95 - 1.13 mm (1.05 ± 0.02, n=9), female, 0.95 - 1.08 mm (1.02 ± 0.03, n=5). Biometric data are given in Table 34.
Head (Fig. 108D) densely covered with coarse punctures which are separated by their own diameter to half the diameter, with microscopic punctures intermingled. Frontal stria complete and feebly carinate.
Pronotal sides (Fig. 107A) slightly arcuate and convergent to apices. Emarginated portion of apical margin bisinuated behind neck. Marginal stria complete laterally and anteriorly. Disk of pronotum densely covered with coarse and somewhat oblong punctures which are somewhat coarser than those of the head. Antescutellar area without a large puncture.
Epipleural stria weakly impressed on apical half. Marginal elytral stria deeply impressed and complete, coarsely punctate inside; the apical end of the stria extending along apical margin of elytron, through apical sutural angle, and shortly extending anteriorly. All dorsal striae indistinct, but feeble oblique depressions present on laterobasal half of elytron. Punctation of elytra (Fig. 107A) similar to pronotal one, but much coarser and sparser except on narrow band along suture and on extreme apex of elytra, the punctures becoming finer mediobasally and coarser around the oblique depression.
Propygidium densely and moderately punctate, the punctures becoming sparser and finer laterally. Pygidium evenly clothed with fine punctures which are separated by three to five times their diameter and become a little denser on apical third. In female, the punctation of pygidium becoming much denser on apical third and sometimes with transverse depression near apex.
Anterior margin of prosternal lobe (Fig. 107B, 108C) truncate; marginal stria shortly impressed only near basal angle and carinate; disk sparsely covered with moderate punctures, which are separated by two to five times their diameter. Prosternal process with complete carinal striae; disk scattered with moderate punctures which are separated by two to ten times their diameter. Descending lateral stria short, complete and strongly carinate.
Anterior margin of mesosternum (Fig. 107B) deeply emarginate at middle, its marginal stria absent anteriorly, but complete and well impressed laterally; apical end of the marginal stria continued to basal end of lateral metasternal stria; disk sparsely clothed with fine punctures which are separated by three times their diameter; transverse stria absent. Intercoxal disk of metasternum similar to punctation of mesosternum, the punctures becoming a little coarser laterally; lateral stria well impressed, extending obliquely and posteriorly, running along mesosternal-metepisternal suture on apical half, its apical end attaining near metacoxal cavity; lateral disk of metasternum sparsely and coarsely punctate. Postcoxal stria extending along mesocoxal cavity, its outer end strongly bent posteriorly.
Intercoxal disk of 1st abdominal sternum sparsely and moderately punctate; 1st abdominal stria straight, well impressed and complete.
Protibia (Fig. 108E, F) with 4 denticles on outer margin. Mesotibia with 3 spinules on outer margin. Metatibia with a spinule near apex.
Male genitalia: as shown in Fig. 109.
Distribution. Japan (Honshû, Kyûshû); Taiwan; Russia (Chabarovskiy Kray). New to Kyûshû.
Remarks. Platylomalus viaticus can easily be distinguished from P. fujisanus by the absence of a transverse stria on the mesosternum and the absence of furrows on the female pygidium. Lewis (1892) described sexual dimorphism in the state of the pygidium, but he confused the sexes.
Table 34. Biometric data of Platylomalus viaticus (Lewis).
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Male Female
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APW 0.47-0.57 (0.53± 0.01) 9 0.46-0.54 (0.50± 0.02) 5
PPW 0.90-1.01 (0.97± 0.02) 9 0.81-1.00 (0.90± 0.03) 5
PL 0.51-0.61 (0.56± 0.01) 9 0.47-0.56 (0.53± 0.01) 5
EL 0.91-1.08 (0.99± 0.02) 9 0.86-0.98 (0.91± 0.02) 5
EW 0.95-1.13 (1.05± 0.02) 9 0.95-1.08 (1.02± 0.03) 5
ProW 0.46-0.56 (0.50± 0.01) 9 0.42-0.59 (0.50± 0.03) 5
ProL 0.10-0.15 (0.13±0.003) 9 0.14-0.15 (0.14±0.004) 5
PyL 0.17-0.27 (0.23± 0.01) 9 0.17-0.25 (0.21± 0.01) 5
PTL 0.35-0.44 (0.38± 0.01) 9 0.34-0.37 (0.36± 0.01) 5
MSTL 0.29-0.42 (0.34± 0.01) 9 0.29-0.34 (0.31± 0.01) 5
MTTL 0.37-0.42 (0.40± 0.01) 8 0.35-0.42 (0.40± 0.01) 5
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[Honshû] <Aomori-ken> 1 ex., Mt. Osore, Shimokita, 31/vii/1956, T. Nakane leg. (NA).
<Fukushima-ken> 1Åâ, Araumi, Minami-Aizu, 9/v/1948, K. Nagayama leg. (NA); 1 ex., Ashinohara, Egawa, Minami-Aizu, 18/v/1948, Y. Kurosawa leg. (NA); 1 ex., Yunohana, Tateiwa, Minami-Aizu, 9/viii/1948, Y. Kurosawa leg. (NA). 1Åä, Nr. Oyama, Nr. Wakamatsu, Aizu, 14/v/1947, Y. Kurosawa leg. (NA); 1Åâ, Suimon, Ômaki, Asahida V., Minami-Aizu, 20/v/1948, Y. Kurosawa leg. (NA).
<Saitama-ken> 1 ex., Yanagikoya, Chichibu, 22/vii/1933, S. Asahina leg. (NA).
<Nara-ken> 3 exs., Kasuga, Nara, 19/vi/1957, 13/vi/1958, T. Nakane leg. (NA); 1 ex., Ditto, 30/iv/1950, N. Yato leg. (NA); 1Åâ, Nara Park, Nara-shi, 7/x/1987, K. Sawada leg.
<Hyôgo-ken> 1Åâ, Hataganaru, 24/v/1955, T. Nakane leg. (NA).
[Izu Isles.] <Hachijô-jima Is.> 1 ex., Suigenchi, Hachijô-jima, 26/vi/1958, K. Mizusawa leg. (NA).
[Kyûshû] <Fukuoka-ken> 1Åâ1Åä, Mt. Hiko-san, 23/x/1985, M. Ôhara leg.
[Taiwan] 2 exs., Karapin, near Mt. Ari, 1/v/1941, Y. Yano leg. (NA).
Korea: Gyeonggi-do: Kwangneung, 15/v/1992 (1 male, 3 female and
2 exs., J.-C. Paik).
[Honshu] Aomori-ken: Ôminato, Mutsu-shi (1 ex., 6/v/1978, APM), S. Sato; Oirase, Fukaura-machi (1 ex., 1/vii/1984, APM), A. Abe.
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