SCOTT— COLEOPTERA, LAMELLICORNIA AND ADEPHAGA 



217 



Melolonthini, 4 species representing 3 genera ; Rutelini, 2 species representing 2 genera ; 

 Cetoniini, 4 species representing 4 genera. 



The distribution of the 25 species will be considered under two heads : firstly, the 

 internal distribution, or distribution among the various groups of islands within the area 

 of tlie Expedition : secondly, the external distribution, or distribution outside that area, 

 and the general affinities of the species. 



Distribution within the area of the Expedition. 



Before considering this, certain features of the various groups of islands must be 

 briefly recalled. The Seychelles differ from all the other groups in being very moun- 

 tainous islands of granitic formation, with luxuriant and highly peculiar indigenous 

 forests remaining in the higher parts of the mountains. All the other groups consist of 

 low islands of coral formation ; of them, the Chagos Group is by far the Easternmost, and 

 nearest to Ceylon and India ; the Amirantes lie very close to the Seychelles ; while the 

 islands of the Aldabra Group (Aldabra, Assumption, Astove, and Cosmoledo) lie farthest 

 to the South-West, and are distinguished from the rest by their nearness to Madagascar, 

 from which country also the flora of Aldabra is largely derived. 



The following table is designed to show the distribution of Lamellicornia within the 



area of the Expedition, 5 groups of islands having to be taken into considei'ation for this 



purpose. 



Before the names of the species : 



* indicates that the species is new to science, 



t indicates that the species is recorded from these islands fur the first time. 



■IS— -2 



