268 Records of the Indian Museum. [VoL. XI, 
turity of his specimens, a suggestion which is not supported by 
the immature specimens of Selenocosmieae in our collection. 
The dense armature of the labium of the Selenocosmieae has 
been recorded as a group character by Simon (Vol. II, p. 953), 
though he does not appear to have attached much importance to 
it. In view of the fact, however, that it supplies a clearly 
defined character which, unlike the stridulating organ, appears 
unchanged in all genera of the group, and thus enables us to 
recognize as a primitive ally of the group ‘‘ Ischnocolus’’ brevipes 
in which no stridulating organ occurs at all, its importance asa 
group character should, in my opinion, be ranked even higher 
than that of the stridulating organ itself. ‘° Ischnocolus’’ brevipes 
may therefore be transferred to the Selenocosmieae, the evolution 
of the higher forms of which is discussed below (pp. 282-287). 
‘“Tschnocolus’’ ornatus must now be considered. It differs 
from the Selenocosmieae not only in the structure of the labium, 
but also in the greater number of spines on its legs. In the 
former character it resembles all, and in the latter the more 
primitive, of the Indian Ischnocoleae. For the present then it 
will be best to associate it with this group and especially with 
the primitive genus Plestophrictus. But its genus cannot be 
definitely determined in the absence of mature specimens of 
either sex. This applies also to the immature specimen referred 
to above, which was collected in the Darjeeling District, and is 
preserved in our co'lection. These two forms are presumably 
remnants of a primitive Himalayo-Malaysian fauna from which 
both the Selenocosmieae and Ornithoctoneae have originated; 
and their rarity is probably accounted for by their inability to 
compete successfully with these more highly specialized groups. 
The Ornithoctoneae are the only Oriental Aviculariinae that 
have not been dealt with above. They form so compact and 
isolated a group that little or no direct morphological. evidence 
of their affinities with other groups is to be found (see Gravely, 
IQI5, p- 417). 
The five Oriental groups of Aviculariinae as described above 
may now be defined. 
‘Anterior part of labium armed with den- 
) ticles somewhat sparsely distributed .. 2. 
{Anterior part of labium covered with 
closely crowded granules .. Selenocosmeae, p. 282. 
2. {Outer surface of chelicerae bare ca 
) Outer surface of chelicerae densely hairy Ornithoctoneae, p. 280, 
No bacilli present on anterior surface of 
coxae of palps, this surface bearing at 
most small spines 
3. A cluster of more or less Gavitorn bacilli, 
accompianed by one or more stout den- 
ticles, present on anterior surface of 
coxae of palps ui .. Poecilotherieae, p. 280. 
