266 Records of the Indian Museum. [Vor, ie 
one another, but also with the Thrigmopoeeae, each genus of the 
two groups (except perhaps Annandaliella, see below, p. 271) 
representing one stage in an evolutionary series culminating in the 
genus Thrigmopoeus. 
Simon’s final revision of the Ischnocoleae brings all the 
Oriental species of the group into three genera, Phlogiodes, 
Heterophrictus and Plesiophrictus, and to these Hirst has since 
added the genus Annandaliella. Of these the first appeats to 
have been known to Simon only from Pocock’s imperfect descrip- 
tion of two forms which probably, as pointed out below (p. 269), 
are opposite sexes of a single species. Of the second he appears 
to have seen a female (the only sex known) of the single species as 
yet referred to it. Of the third the male was evidently known to 
him from Pocock’s description only. It is, therefore, scarcely to 
be wondered at, that his definitions of these genera are somewhat 
unsatisfactory, and that several of the species described below 
differ from the genera in which I have placed them in one or more 
of the characters used in his keys; but as they differ at least 
equally widely from all extra Oriental genera and appear to be 
closely related to one another, I have thought it best to place 
them in these Oriental ones. 
An account of the genera of Indian Ischnocoleae and of 
Thrigmopoeeae will be found below (pp. 269-280). It is designed to 
bring out the evolutionary sequence which the genera appear to 
illustrate. This sequence seems to me to indicate that the two 
groups should ultimately be united; and that if any characters can 
be found to separate both of them from the extra-Oriental Ischno- 
coleae, a new group should be instituted for them. But as I have 
no extra-Oriental forms for comparison I am not able to attempt 
this at present. 
None of the genera of Indian Ischnocoleae and ‘Thrigmopoeeae 
have attained so high a degree of specialization as have the 
genera Poecilotheria and Chilobrachys, which also live in the Indian 
Peninsula and Ceylon. The former lives in trees and in the 
thatch of houses, so can scarcely be regarded as entering into 
competition with ground-dwellers like the Indian Ischnocoleae!. 
I have elsewhere (1915, pp. 417-418) given reasons, largely zoogeo- 
graphical, for supposing that it originated from a primitive stock— 
presumably of the Ischnocoleae or Thrigmopoeae—in the Indian 
Peninsula or Ceylon. It will be sufficient here to point out that 
it differs from the Selenocosmieae not only in important details of 
the stridulating organ, but also in the structure of the labium—for 
which reasons, among others, I prefer to follow Simon who estab- 
lished a special group, Poecilotherieae, for its reception, rather 
than Pocock who united it with the Selenocosmieae. 
! Nothing appears to be known of the habits of the Uhrigmopoeeae, which 
probably resemble those of the Ischnocoleae. The specimen | obtained in Cochin 
was not recognized when captured. If I caught it myself it must have been on 
the ground, like all the other Mygolomorphae I found. But it may have been 
brought to me by someone else. ~ 
