THE TETTTGIDyE OF CEYLON. 
105 
necessity of subdividing that part of the Oriental region, includ¬ 
ing Ceylon as a “Ceylonese” province which is set forth in the 
following quotation: “The Island of Ceylon is characterized by 
such striking peculiarities in its animal productions as to render 
necessary its separation from the peninsula of India as a sub-region: 
but it is found that most of these special features extend to the 
Neilgherries and the whole southern mountainous portions of 
India, and that the two must be united in any zoo-geographical 
province. The main features of this subdivision are the appear¬ 
ance of numerous animals allied to forms only found again in the 
Himalaya or in the Malayan sub-region, the possession of several 
peculiar generic types, and an unusual number of peculiar species.” 
It will be seen that my observations given above and those 
further on relating to the geographical distribution of the Tetti- 
gidse have a significant bearing in supporting both of these claims 
made by Wallace. 
Geographical Distribution. 
The Tettigidse are by no means confined to any single portion 
of the world, but are widely distributed. In Ceylon we infer 
these insects are quite generally distributed, and some of the 
genera occurring here have quite an extensive range passing the 
borders into other countries as before intimated, while again some 
genera are confined to the island. So far as our present knowledge 
indicates the genera Dellonotus , Lamellitettix , and Apterotettix 
are of this latter class, all being represented by single monotypic 
species found in the Central Province. The genus Cladonotus 
ranges to Japan, the Philippines, New Guinea or Papua, and within 
Ceylon two species occur in the Central and Eastern Provinces. 
Scelimena presents two species from the Central Province, and 
like the preceding genus passes the borders of the island into Java, 
Burma, and British India. With respect to Gavialidium two 
species are found here in the Central Province. The range of 
distribution of the genus extends to Celebes, the Philippines, 
Burma, and New Guinea. A number of species have been 
included by authors in the genus Griotettix which, in all probability, 
do not belong there. For this reason the species appear to be 
unusually numerous. The genus is here represented by only two 
species. They are both found in the Central Province, while out¬ 
side of Ceylon, according to data at hand, it extends to Sumatra, 
Celebes, New Guinea, Lower Burma, and Southern India. The 
genus Acanthalobus , with its two species, occurs in the Central 
and Western Province, in the region about Colombo. Loxilobus , 
with its two species is found in the Central Province, and may be 
