270 Records of the Indtan Museum. [Vo.. XI, 
be stridulatory structures; but so far as 1 know there is no direct 
evidence on this point. It is difficult to find any other explana- 
tion for them; in view, however, of the fact brought out by 
material recently added to our collection, that they do not occur 
in specimens less than half grown, or in mature males, their physio- 
logical homology with the stridulating organs of other Oriental Avi- 
culariinae is open to question. But for the importance that has 
been attached to these spines the only species yet referred to the 
genus would find its natural place somewhere near the middle of 
the series of species composing the genus Pleszophrictus. 
This series shows a gradual change from small forms with 
small marginal posterior sigilla and more distinctively Plesio- 
phricticid anterior coxae, to larger forms with larger posterior 
sigilla more widely separated from the margin of the sternum and 
more distinctively Heterophricticid coxae, characters all of which 
are intensified in the genus Phlogiodes, which affords a transition 
to the Thrigmopoeeae. 
If the genus Phlogiodes were only distinguished by the size 
and position of its sigilla, and by the shape of its fovea—the cha- 
racters used by Pocock in his key—its distinctness from Pleszo- 
phrictus could hardly be maintained. Probably the most important 
character separating the two genera is the absence in Phlogiodes 
of the tibial apophysis of the first leg of the male—a cha- 
racter which separates it alike from Plesiophrictus and An- 
nandaliella.'| But this character does not help in the case of 
species (unfortunately the majority) known from females only. 
It appears, however, that Phlogiodes approaches the Thrigmo- 
poeeae in the characters of its feet, as in so many other features. 
The feet of the Thrigmopoeae are very different from those of 
Plesiophrictus ; and it is likely, I think, that the character will 
prove to be a valid one for the separation of Phlogiodes from 
Plesiophrictus, in spite of a certain amount of variation which it 
exhibits in the latter and perhaps in both genera. 
The genera of the Indian Ischnocoleae may now be redefined 
thus :— 
/A row of stout spines present on the inner 
surfaces of the chelicerae of mature fe- 
males ; feet of first legs slender, the divi- 
sion of their tarsal scopulae more or 
less obsolete especially in male; male 
with tibial apophysis of first leg .. Annandalella, p.271. 
No spines on the inner surfaces of the 
chelicerae sh 63 is a; 
1 The possession of this apophysis, and of somewhat numerous spines on the 
legs generally, suggests a possible relationship between the more primitive Indian 
Ischnocoleae and the Indian Barychelinae. In the Indian Barychelinae, however, 
the spines thickly cover all joints of the legs, and no definite arrangement of them 
can be recognized. In the Indian Ischnocoleae such an arrangement is recog- 
nizable among the few spines that may be present on the anterior legs, and is 
repeated on the posterior legs in all species in which their spines have been 
reduced to a small enough number (sce below, p. 274). 
