STUDIES ON THE JAPANESE TRECHINAE (III)

Numerous species of the carabid-beetles have been known to be semiaquatic _ The habitats of most of those species are adjoining inland waters and only a very few members of them penetrate into the sea. The studies on the marine beetles are, however, one of very interesting subjects to Coleopterologists. A most remarkable feature in the advanced marine forms is a striking morphological resemblance to cavernicoles, that is, the depigmentation of integument, the degeneration of eyes and of metathoracic wings, and so on. Beautiful examples of such adaptations are found in the species belonging to the Trechid subtribe Aepi. In Japan the Coleopterological researches for the intertidal fauna have long been drawn only a little attention, but there are fairly many species inhabiting the intertidal zones on the coast of. the insular country. The present paper deals with three genera, namely, Peri!eptus, Sakagutia (new genus) and Armatocillenus, all of which contain the marine species. At the same opportunity, adding to the descriptions of the marine forms, the Japanese representatives of the genus Perileptus are also enumerated. One of the new- specie