344 ZOOLOGICAL GEOGRAPHY. [PART III. 
abundant and characteristic. Out of the 41 Oriental genera 21 
are Malayan, and 10 of these are not found in the other sub- 
regions. 
In Lucanide the Malay islands are rich, 14 out of the 16 
Oriental genera occurring there, and 3 being peculiar. There 
are many fine species of Odontolabris, which may be considered 
the characteristic genus of the sub-region. 
The Cetoniidz are well represented by 16 genera and about 120 
species. The genera Mycteristes, Phedimus,Plectrone, Euremina, 
Rhagopteryx and Centrognathus are peculiar, while Aygestrata, 
Chalcothea, and Macronota are abundant and characteristic. 
The Longicorns, as in all continental forest regions near the 
equator, are very abundant and in endlessly varied forms. No 
less than 55 genera containing about 200 species are peculiar to 
this sub-region, the Cerambycidz being much the most numerous. 
Euryarthrum, Celosterna, Agelasta, and Astathes may be consi- 
dered as most characteristic ; but to name the curious and in- 
teresting forms would be to give a list of half the genera. For 
the relations of the Longicorns of the Indo-Malay, and those of 
the Austro-Malay region, the reader is referred to the chapter on 
the distribution of insects in the succeeding part of this work. 
Terrestrial Mollusca——The Philippine islands are celebrated 
as being one of the richest parts of the world for land shells, 
about 400 species being known. The other islands of the sub- 
region are far less rich, not more than about 100 species having 
yet been described from the whole of them. Helix and Buli- 
mus both abound in species in the Philippines, whereas the 
latter genus is very scarce in Borneo and Java. Ten genera of 
Helicide inhabit the sub-region; Pfeifferia is found in the 
Philippines and Moluccas, while the large genus Cochlostyla is 
almost. peculiar to the Philippines. Of the Operculata there are 
representatives of 20 genera, of which Dermatoma and Pupi- 
nella are peculiar, while Registoma and Callia extend to the 
Australian region. Cyclophorus, Leptopoma, and Pupina are 
perhaps the most characteristic genera. 
