Invertebrate Gallery of the Indian Museum. 83 



{Saltigrada;, of which Salticus and Plexippus are ex- 

 amples), there are certain species which resemble ants 

 and often live with the ants in their nests. By means of 

 its resemblance to the ants, and its association with them, 

 the spider is believed either to escape the notice of 

 enemies to which ants are distasteful, or to be enabled to 

 make unsuspected attacks upon insects that do not fear 

 ants. This deceptive resemblance of an animal of one 

 species to an animal of a quite differet species or class, 

 for the purpose of deceiving either enemies or prey, is 

 known as "mimicry ", the species that profits by the re- 

 semblance being known as the mimic. Specimens of an 

 ant-like Salticus with specimens of the ant that it mimics 

 are shown in Case 60, and in Case 97B of the Insect series 

 there are some enlarged drawings and photographs illus- 

 trative of this phenomenon. 



The true Spiders are represented in Case 60 by speci- 

 mens of the following genera, almost all of which are 

 Indian : — My gale , Scurria, Atmetochilus, Cyriopagopus ; 

 Epeira,Nephila, Nephilengys, Acrosoma, Gasteracantha, 

 Actinacantha, Stanneoclavis, Ccerostrts, Meta, Cyclosa, 

 Tetragnatha ; Pholcus ; Tegenaria ; Thomisus ; Spheda- 

 nus, Leptoctenus, Thelictopis, Palystes, Heteropoda^ Ocy 

 ale, Hippasa, Lycosa ; Salticus, Plexippus, Cyllobelus^ 

 Cytxa. 



ii.- ARACHNID A PHALANGIIDA. 



[SEcstern SEaU-£a0e 58]. 

 The Phalangiida very much resemble the true Spiders, 

 from which they differ (i) in having the rings or somites 

 of the abdomen separate and distinct, (2) in having tho 

 abdomen joined to the cephalothorax along its whole 

 breadth, and not merely by a stalk, (3) in having the 

 mandibles or "chelicerse " in the form of small "chelae*' 

 or pincers, (4) in being without spinning glands, and (5) 

 in breathing not by tracheal sacks, but by true tracheae. 



i> 2 



