218 PERCY SLADEN TRUST EXPEDITION 



Summarizing the above : 1 9 species were found in the Seychelles ; 1 2 of these were 

 found only in the Seychelles proper, 2 in the Seychelles and also in the Amirantes, 2 in 

 the Seychelles and also in the Chagos, while 1 ranges over the Seychelles, Amirantes, 

 Chagos, and Farquhar Groups. 7 species were found in the islands of the Aldabra Group ; 

 5 of these were found only in that group, 1 was found also in the Farquhar Group, and 

 only 1 was found both in Aldabra and in the Seychelles, and that one species is repre- 

 sented in the latter group by a distinct variety. 



External distribution. 



In discussing the afBnities of the species and their distribution outside the area of 

 the Expedition, it is convenient to treat of them under two heads, namely (A) species 

 found in the Seychelles, including under this head both those occurring only in the 

 Seychelles and those which occur also in other groups of islands ; and (B) species found in 

 the Aldabra Group (including those which occur also in certain other of the islands). 



A. Seychelles. The Lamellicorn-fauna may be divided into the following classes : 



(i) Endemic forms, which may be further subdivided into : 



(rt) species belonging to genera known only from the Seychelles : Nesohoplia 

 senecionis, Perissosoma asnescens, Perissosoma grande ; 



(h) species belonging to very widely-distributed genera, but (so far as is 

 known) not closely-related to their congeners in surrounding lands : 

 Figulus seychellensis, Oxyomus palmarum, AtcBnius lodoicece. 



(ii) Species peculiar to the Seychelles, but representative of a widespread oriental 

 genus : Parastasia coquereli (closely-related to the Ceylon species Para- 

 stasia hasalis Cand.). 



(iii) Madagascar-Mascarene species : Figulus striatus (represented in Seychelles by 

 a distinct variety), Saprosites laticeps. 



(iv) Species common to Africa and Madagascar : Aphodius nigritus, Rhyssemus 

 goudoti. 



(v) South-Asiatic species, which extend their range also into Madagascar and the 

 Mascarenes : Oxycetonia versicolor, Protcetia aurichalcea. 



(vi) African species (not ranging into Madagascar) : Oryctes monoceros. 



(vii) Very widely-spread species : Aphodius lividus (cosmopolitan), Atcenius 



frater (known from West Indies and Singapore), Rliyssemus ritsemcB 



(West Africa, with a variety in the East Indies), Saprosites pygmcBus 



(Malay Archipelago and Sandwich Islands), Adoretus versutus (spread over 



oriental region to Fiji, and known also from St Helena). 



It is important to notice that the endemic forms were for the most part found 

 exclusively in the native mountain-forests among the endemic vegetation : in particular 

 Nesohoplia senecioiiis, Oxyomus palmarum and AttBiiius lodoicece, all appear to be 

 specially attached to certain endemic plants (see pp. 225, 226, 232). On the other hand, 

 nearly all the Southern Asiatic, African, and Madagascar species, which have extended 



