1915.] F. H. Gravety: Indian Mygalomorph Spiders. 259 
illustrations it contains are adequate and that reasonable care has 
been taken to avoid repetition, the more complete is his work 
likely to be. I propose therefore to describe a certain number of 
species as new, even though I may not be able to trace every pos- 
sible description that may refer to them. 
‘The very small number of extra-Oriental forms in our collec- 
tion makes it impossible for me to criticize the relation which 
these bear to Oriental forms in Simon’s system. Where, however, 
as in the case of the Aviculariinae dealt with in the present paper, 
the Oriental forms appear to exhibit definite structural zoogeogra- 
phical relationships to one another, I have not hesitated to suggest 
the advisability of trying to alter his system in order to bring 
these into prominence. Such relationships have been found in all 
of the few groups in which I have looked for them. In the case 
of one of these groups—the Passalidae—in which such relation- 
ships recently led me to separate the Indo-Australian forms from 
those of the rest of the world, none of which I had seen, I have 
already obtained proof that the separation was justified; though 
some of the latter resemble certain Indo-Australian forms so 
closely that I, like previous authors, should probably have been 
misled by striking superficial characters, had not my earliest work 
on the family been confined to Indo-Australian species. 
The characters on which the classification of spiders is at 
present based are to a great extent admittedly unsatisfactory ; 
and itis quite possible that by dealing separately with the faunas 
of different zoogeographical areas—the extent of the areas that will 
have to be taken may be found to differ in different groups— 
local relationships may be brought to light which will lead to the 
discovery of new characters of deeper significance where we least 
expect them, especially among the more sedentary families. 
References to Simon’s ‘‘ Histoire Naturelle des Araignées”’ 
and to Pocock’s ‘‘ Fauna’’ volume are so numerous that I have 
omitted the titles of these works throughout. Where not otherwise 
stated all references to these authors imply references to these 
works, Where no references to descriptions of species are given, 
these will be found in the ‘‘ Fauna’’. | 
It has been convenient to put this paper into the form of 
a catalogue of the specimens in our named collection, a form 
which wili probably be convenient for the rest of the series also. 
Our collection of spiders has recently been increased to a con- 
siderable extent by the generosity of collectors in different parts 
of India. This has made it more representative of India generally 
than would otherwise have been the case, and has greatly facili- 
tated my work. Our thanks are due to all who help us in this 
way, and especially to H.E. the Governor of Bengal who, with 
the assistance of Mr. Mdller, has been making large collections of 
the Invertebrata of the Darjeeling District; to Dr. Sutherland 
who has collected spiders extensively round Kalimpong in the 
same district; to Mr. M. Mackenzie who has sent numerous 
specimens from Siripur in Bihar; to Mr. (+. Henry who has 
