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Journal of the Speleological Society of Japan


Volume 7

Shun-Ichi UENO
Yamautidius (Coleoptera, Trechinae), an Example of Remarkable Genitalic Differentiation
  The anophthalmic trechine beetles belonging to the nominate subgenus of Yamautidius are dealt with. Twenty-one species hitherto found, of which eighteen are new to science, are all localized at the western part of the Island of Shikoku in Southwest Japan, and are very closely similar to one another in external morphology, though they can be divided into a few groups by the structural difference in the basal peduncle of elytra. On the other hand, they are remarkably diverse in the structure of male genitalia and are classified into nine complexes of three species-groups mainly on this character. The species newly described are : Y. ishikawaorum, Y. hirakei, Y. tetsuoi, Y. squamosus, Y. spinulosus, Y. securiger and Y. flabellatus [group of Y. ishikawaorum], Y. uozumii, Y. mohrii, Y. debilis, Y. eos, Y. edentatus, Y. basisquamatus, Y. yamauchii, Y. compositus, Y. emarginatus and Y. dilaticollis [group of Y. Iatipennis], and Y. rarissimus [group of Y. pubicollis].
Shun-Ichi UENO
The Rakantrechus (Coleoptera, Trechinae) of the Island of Shikoku, Southwest Japan
 A new subgenus of Rakantrechus is erected for a new species found in abandoned adits of copper mines lying at the northwestern corner of the Island of Shikoku, Southwest Japan. It is related to Uozumitrechus distributed in the western-most area of Honshu, and is rather apart from Rakantrechus (s. str.) which has been the sole representative of the genus hitherto known from Shikoku. The new name given is Rakantrechus (Izushites) subglaber. A new locality of Rakantrechus (s. str.) kawasawai is also recorded .
A New Leptonetid Spider from a Limestone Cave of Western Shikoku, Southwest Japan
  A new leptonetid spider, belonging to the group of Sarutana, is described under the name of Leptoneta yamauchii. It resembles L. kawasawai (KOMATSU), but can be distinguished from that species by the shape of male palp. Its type-locality is the limestone cave called Kuroiwa-do in Ehime Prefecture, western Shikoku, Southwest Japan.
Yoshiaki NISHlKWA
A New Leptoneta (Araneae, Leptonetidae) from a Green Tuff Mine in Toyama Prefecture, Central Japan

 A new spider, Leptoneta inabaensis, is descirbcd from abandoned adits of the green tuff mine at Mine in Toyama Prefecture, Central Japan.

Gamasid Mites (Acarina) Found in the Subterranean Domai of Southwest Japan
  Free-living gamasid mites are studied in mine adits and natural cavities in Southwest Japan. As the result, thirty-one species belonging to nineteen genera of nine families are found. Of these, three species are new to science, and one is recorded for the first time from Japan.
Kazuhisa YOSHIMURA and Toshikazu TARUTANI
Chemical Components of Groundwaters in Okinoerabu-jima Island, the Ryukyus
 Cave and spring waters around Mt. Oyama of Okinocrabu-jima (Is.). Kagoshima Prefecture, were measured for temperature, pH, RpH, and contents of Na+, K+, Mg2+, Ca2+, Sr2+, Cl-, HCO3-, SO42- and Si02. Equilibrium C02 pressure of water (PCO2) and saturation indices for calcite and dolomite were also evaluated, ion-pair formation among chemical components being taken into consideration. Ca2 + and HCO3-, major components of the groundwaters, are supplied by the dissolution of the Ryukyu Limestone in the presence of CO2. Na+ and K+ may be supplied from the sea as chlorides and by the erosion of non-carbonate rocks in the presence of CO2, in analogy with other limestone areas in Japan. From PCO2 and Slc obtained, it is concluded that rain waters in this area gain CO2 from the soil atmosphere of partial CO2 Pressure of l0-1.6 to 10-1.2 atm, and dissolve limestone as seeping down to the well-developed cave systems, and that the groundwaters outgass CO2 to some extent due to ventilation.