432 Mr. H. B. Preston on 



is smooth, broad, and truncated at the end. The clypeus is 

 short, with its front edge straight and slightly reflexed. 

 The antennas are 9-jointed. The pronotum is distinctly 

 longer than wide and greatly contracted in front and behind, 

 without the tooth in the middle of the hind margin and 

 corresponding notch in the scutellum so characteristic of 

 Ancistrusoma. The legs are long, slender, and thinly clothed 

 with long hair, the front tibia? bearing two rather feeble 

 teeth. The claws are simple, long, and slender, and each 

 claw-joint bears at the end four very long fine hairs, placed 

 at equal distances round the base of the claws and pointing 

 outwards. 



Many of these features are no doubt peculiar to the male 

 sex. 



LII. — New minute Terrestrial and Aquatic Mollusca from 

 the Dutch East Indian Island of Beilan- Beilan, with 

 Descriptions of Four neiv Genera and Subgenera. By 



H. B. Preston, F.Z.S. 



The islet of Beilan-Beilan, in which the species of which 

 diagnoses are below given were collected, is situated to the 

 north of Great Obi or Ombirah Island, in hit. 1° 20' S. and 

 long. 127° 21' E. Through the great kindness of the owner, 

 Mr. Diepenheim, two bags of dead leaves were received from 

 this island, which, when thoroughly sifted, were found to 

 contain a very large number of mollusca, in the sorting of, 

 and search for, which the author has been greatly assisted by 

 his indefatigable friend Mr. T. Iredale. 



In addition to the species lure enumerated, pieces of 

 several large species (probably Helicoids) were also discovered, 

 but these were of a far too fragmentary nature to allow of 

 recognition or description. 



As the island, originally covered with jungle, is destined 

 to be cleared and planted with coconuts, it is to be feared that, 

 if not all, at any rate the greater part, of these interesting 

 species are doomed to extinction at an early date. 



In the present paper no figures are given, but it is hoped 

 by the author to write further papers on the island, when 

 this will be duly done. 



Charopa moluccensis, sp. n. 

 Shell (as seen under a 1-inch objective) minute, orbicular, 



