著者

石原 保

出版者

東京動物學會

雑誌

動物学雑誌 (ISSN:00445118)

巻号頁・発行日

vol.66, no.8, pp.337-340, 1957

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Bathysmatophorus J. Sahlberg, 1871, is a Palaearctic genus having been represented by a single boreal species, B. reuteri J. Sahlberg, 1871, and it is closely related to the Nearctic genus, Thatuna Oman, 1938, which was established by Dr. P. Oman with the following note and description:-"I am not familiar with B. reuteri and my concept of the genus is based upon the original description and Fieber's illustrations. Thatuna differs from Bathysmatophorus in the venation of the fore wing, which has the outer anteapical cell small and triangular and the central anteapical cell usually open baselly" [Proc. U. S. Nat. Mus. 85: 176]. Although the venation of Bathysmatophorus is so irregular that no definite generic diagnosis has been found in it, the genotype, Thatuna gilletti oman, 1938, has the appendix comparatively small and has the well developed subapical apophyses in the aedeagus which are not found in any known species of Bathysmatophorus [Oman, 1938, loc. cit. 177 pl. 6, f. 14]. Judging from these characters, Thatuna may deserve to be segregated from Bathysmatophorus and therefore the latter should be considered a genus distributed in the Palaearctic region. I described in this paper following two new japanese species of the genus, no species of which had hitherto been recorded from Japan. All the type-specimens dealt with in this paper are preserved in the Entomological Laboratory, College of Agriculture, Ehime University, Matsuyama. 1.Bathysmatophorus linnavuorii sp. nov. (Fig. 1, 1; Fig. 2, 1) Length of body ♂6.3-7, ♀8-10mm. Id. till the apices of tegmina ♂ about 7.8mm. Tegmen ♂6.3-7, ♀(brachypterous f.) 3-4.3mm. Weakly lustrous, mostly light blackish brown, with blackish markings as shown in figures. Habitat: Hokkaido (Mt. Daisetsu and its ranges). Specimens examined: Holotype (♂), allotopotype (♀) and 4 paratopotypes (3♂♂, 1♀), Kurodake, Mt. Daisetsu, 18-19, VII, 1951, T. Ishihara et K. Sasaki leg. 1 paratype (♂), Sounkyo at the foot of Mt. Daisetsu, 7. VII. 1951, Shizuo Kato leg. Although this new species is closely related to B. reuteri in the general appearance, the former is distinguished from the latter by the following characters. The body is bigger and robuster. The microsculpturing of vertex and of pronotum is more distinct and therefore this species is somewhat duller than B. reuteri. The plates are a little broader, with the median margin more insinuated near apex. The apophysis of style is much dissimilar. The trivial name is dedicated to Mr. R. Linnavuori, to whom I am indebted for obtaining the generic concept that the above related characters differ from those of European species. 2.B. japonicus sp. nov.(Fig. 1, 2; Fig. 2, 2). ♂ Length of body 6-6.2, id. till the apices of tegmina about 8, tegmen 6.3-6.6mm. ♀. Unknown. Mostly shining black, with light brownish markings as shown in the figures. Habitat: Honshu (Fukushima Prefecture and Niigata Pref.). Specimens examined: Holotype (♂) and 2 paratopotypes (2♂♂), Higashiyama, Kita-Aizugun, Fukushima Pref. 29. V. 1949, the late Koichi Nagayama leg. 1 paratype (♂), Miomote, Niigate Pref. 30. V. 1956, Kintaro Baba leg. The present new species may be easily identified by the characteristic coloration entirely different from other known species of the genus. The internal characters of the male genitalia rather resemble those of B. reuteri but the aedeagus of this species is constricted in the basal portion, being wanting of the apophysis placed dorso-basally and has the comparatively short distal portion recurved cephalad.