1915.] F.H. Gravety: Indian Mygalomorph Spiders. 269 
{ 
a stridulating organ present between 
)  chelicerae and coxae of palps .. Ischnocoleae, p. 269. 
a | A stridulating organ present in this posi- 
tion i ths .. Thrigmopoeeae, p. 278. 
If any character can be found by means of which the Indian 
Ischnocoleae can be separated from the Ischnocoleae of other 
parts of the world it will be advantageous, as pointed out above 
(p. 266), to bring about this separation, at the same time uniting 
the former with the Thrigmopoeeae 
Group ISCHNOCOLEAE. 
Among Indian genera of this group there appears to be a 
marked sexual dimorphism. All known males are distinguished 
by the more or less extensive and conspicuous development of 
white hair on the feet, especiaily the anterior ones. 
In the two species of which males are known to me, the 
anterior tarsal scopulae, which, except in the genus Phlogiodes, 
are always more or less clearly divided in females,! are either 
undivided in the male or less clearly divided in the male than in 
the female; also the anterior median eyes tend to be enlarged in 
the male and the anterior laterals in the female.? As yet all 
species of this group appear to have been described from one sex 
only; but there can be little doubt, I think, that Phlogtodes ro- 
bustus, Poc. (2°) = P. validus, Poc. (o&), since both are found at 
Matheran. In the former, according to Pocock (1899, pp. 748-9), 
the tarsal scopulae are broadly divided on legs 2-4, in the latter 
they are undivided except on the fourth leg where the division is 
narrow. 
I have found it impossible to separate the genus Heterophrictus 
from Plesiophrictus. Pocock’s distinction, based on slight differ- 
ences in the shape of the fovea, is very unsatisfactory. 
Simon separates them primarily on characters presented by 
the vestiture of the anterior surfaces of the coxae of the first legs. 
But these vary even in mature examples of one sex of asingle species, 
and they are clearly correllated with size, the Plestophrictus 
characters being found in the young of large forms whose adults 
have well-marked Heterophrictus characters, as well as in adults 
of species of small size similar to that of the species grouped 
together by Pocock in the former genus. 
The genus Annandalella ought also, perhaps, to be merged in 
Plesiophrictus ; but as the spines on the inner surfaces of the cheli- 
cerae, by which it is characterized, are sharply distinctive, I retain 
the genus provisionally. These spines are considered by Hirst to 
! They are said to be undivided in Annandaliella travancorica, but fresh 
specimens show a median line of fine hairs such as accompany the spines by which 
the scopulae of the other feet are divided. 
2 In females of Plesiophrictus sericeus, collinus and fabret, according to 
Pocock, the anterior laterals are not larger than the medians. Males do not 
appear to be known in any of these species. 
