No. X.—COLEOPTERA; HYDROPHILIDA, HISTERIDA. 
By Huew Scorr, M.A. (Canras.), F.L.S., F.E.S., Curator in Entomology in the 
University of Cambridge. 
(Plate 14.) 
Read 5th June, 1913. 
THIS paper is a report on the Hydrophilide and Histeride of the islands in the 
western Indian Ocean visited by the Percy Sladen Trust Expedition in 1905 and 
1908—9: that is, the Seychelles, the Farquhar Group, Aldabra and the neighbouring 
islands, &c. It is the result of a study of the collection formed by this Expedition, 
but species previously recorded from these islands but not collected by the Expedition 
are also included in their proper systematic position, so that the paper.may provide a 
complete enumeration of the Hydrophilidee and Histeridee known from these groups 
of islands. 23 species of Hydrophilide and 16 of Histeridse are here enumerated, 
while previously only 6 Hydrophilide and 8 Histeridze had been recorded. 14 new 
species and 3 new genera are described. 
As regards general considerations of affinities, distribution, &c., the two families 
are considered separately, a brief general account being prefixed to the systematic account 
of each on pages 194 and 222 respectively. 
Types. A first set of all the material, including the types of all new species and 
genera, will be given to the British Museum. A second set will be kept in the Cambridge 
University Museum. 
Localities. Under each species is given a locality-list including the fullest possible 
data as to where and when it was found. The dates “1908” or “1908—9” standing 
alone (z.e., not followed by a collector's name) after any data, always indicate that the 
specimens were collected by myself, or by some of those who helped me while I was 
in the Seychelles. Similarly “1905” standing alone indicates that the material was 
obtained by the earlier Perey Sladen Trust Expedition (that is, the Expedition of 
H.M.S. “Sealark”). In all other cases the collector's name is placed in brackets after 
the data. When a species is found outside the area of the Expedition, a brief summary 
of its external distribution is given at the end of the locality-list. 
Literature. In the literature-references the abbreviation “ Alluauid, Liste Coléopt.” 
stands for Alluaud’s “Liste des Insectes Coléoptéres de la Région Malgache” (vol. xxi. 
of Grandidier's “Histoire Physique, Naturelle et Politique de Madagascar,” 1900). I 
have frequently had to refer to papers by Régimbart, Ann. Soe. ent. France, vol. 1xxii. 
1903, and vol. Ixxv. 1906. The Histeridz collected in the Seychelles by Alluaud in 
1892 were reported on by J. Schmidt in Bull. Soc. ent. France, 1893, p. 99. Certain 
* Almost entirely the same system is followed as in my paper on the Lamellicornia and Adephaga, in 
vol. xv. of these Transactions, 1912, p. 215. 
