1915. ] K. Narayan: Ant-like Spiders. 397 
The thoracic part at its apex is almost as high as the cephalic, 
and not lower as in # M. plataleoides. ‘The cephalic part rounds 
off behind the dorsal eyes but not so abruptly asin M. plataleoides. 
In M. plataleoides the thoracic part is almost flat dorsally but in 
this species there is a hump just in front of the middle. There 
is a sharp declivity in front of the hump, but it slopes gra- 
dually behind. 
The constriction in the abdomen is not so well-marked as in 
M. flataleoides ; it may possibly be due to its being full of eggs. 
The epigynum is characteristic (pl. xxxii, fig. 2) and serves to 
distinguish this species at once from the female of M. fplataleotdes, 
the vulva of which has an entirely different structure and shape 
(cf. Peckham, Ant-like Spiders, 1892, plate ili, fig. 1C). The vulva 
here consists of two circular white spots between which lies the 
genital armature. This is formed of two club-shaped masses which 
are fused just opposite the circular spots but diverge a good deal 
posteriorly ; they diverge a little anteriorly but soon converge 
again. Posteriorly, at the meeting point of the diverging flanks, 
there are 2 spine-like processes, one on each side. 
Colour.—The colours are mostly the same as in M. plataleoides, 
but the abdomen is yellowish-white and is covered all over with 
very stnall polygonal areas, flaky in appearance. In one of the 
specimens the abdomen is flat ventrally and is depressed in the 
middle line. 
It is worthy of note that the specimen collected by Mr. Gravely 
at Pusa was found along witha 7 M. flatalzotdes and a few of the 
ants of the species Oecophylla smaragdinea. It is possible that M. 
plataleoides and M. incertus are distinct in the female sex only, 
and that the males from Bihar and Bengal, which I have identified 
with the former species, belong in reality to the latter. 
Myrmarachne tristis, E. Simon. (2?) 
(Plate xxxii, fig. 3.) 
This species was first described by Simon in Ann. Soc. Ent. 
France, 1889, p. 115, but the description is based on a o& speci- 
men. Peckham also describes the species but gives no diagrams 
of the epigynum or other 9 characters, although he gives measure- 
ments of the 2 type. I have found 3 females in the Indian Museum 
collection which I have identified as belonging to this species. 
Calcutta (F. H. Gravely). 
Madras. 
Madras (Prof. Ramunnt Menon). 
Measurements. 
Calcutta specimen. 
Total length 6:2 mm. 
Cephalothorax : length 3 mm.; width 1°4 mm. 
Legs 4312. 
