'6U ZOOLOGICAL GEOGRAPHY. [paht hi. 



aliundant and cliaracteiislic. Out of the 41 Oriental genera 21 

 are ]\Ialayan, and 10 of these are not fonnd in the other sub- 

 regions. 



In Lucanidae the I\Ialay islands are ricli, 14 out of the IG 

 Oriental genera occurring tliere, and o being peculiar. There 

 are many line species of Odonfolahris, which may be considered 

 the cliaracteristic genus of the sub-region. 



The CetoniidLC are ^^'ell represented by 16 genera and about 120 

 species. The genera Mjjdcristcs, Pha:.diniiis,Plcctronc,Eur(vinina, 

 WiarpptcryK and Centrognathns are peculiar, while Agcstrata, 

 Cliah'otlica, and Macronota are abundant and cliaracteristic. 



Tlie Longicorns, as in all continental forest regions near tlie 

 equator, are very abundant and in endlessly varied forms. No 

 less than 55 genera containing about 200 species are peculiar to 

 this sub-i'egiou, the CerambycidcTe being much the most numerous. 

 Euryarthrum, Cmlosterna, Agelasta, and Astathes may be consi- 

 dered as most characteristic ; bnt 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 tlie Indo-Malay, and those of 

 the Austro-lMalay region, the reader is referred to the chapter on 

 the distribution of insects in the succeeding part of this work. 



Terrestrial Mollitsca. — The Philippine islands are celebrated 

 as Ijeing 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 descril)ed from the whole of them. Helix and Bidi- 

 mus l)oth abound in species in the Philippines, whereas the 

 latter genus is very scarce in Borneo and Java. Ten genera of 

 Helicidse inhabit the sub-region ; Pfciffcria is found in the 

 Philippines and Moluccas, wliile the large genus Coclilostyla is 

 almost peculiar to the Philippines.' Of the Operculata there are 

 representatives of 20 genera, of whicli Dcrmedoma and Pvpi- 

 nella are peculiar, while Ecgistoyna and CaUia extend to the 

 Australian region. CyelopliorvSy Lcp)topcjma, and Pupina are 

 perhaps the most characteristic genera. 



