126 



Records of the Indian Museum. 



[Vol. Ill, 



species ; in closely allied species such as Ectobius lapponicus, L. 

 and E. perspicillaris, Herbst, they appear to be identical, but 

 though I have examined a considerable number of species, 

 I have not 3^et found the processes to differ in structure in the 

 same species at different stages in its life-history. Since these pro- 

 cesses differ in the larvse and in the adult submitted to me by 

 Dr. Annandale (text-figs, i and 2), I am consequently of opinion 



c 



Fig. I. 



Fig. 2. 



Pig. I. — Right lacinia of Epilampya annandalei, ci", inner aspect, x 100. 



,, 2. — Right lacinia of Epilampra sp., larva, outer aspect, x 100. 

 a = process of lacinia. 



Note. — The bifid tip of the lacinia shown in fig. 2 is hidden beueath the large 

 outer tooth. 



Drawn with the camera lucida. 



that the larvae and adult must be referred to two quite distinct 

 species. The adult exhibits no modifications whatever for an 

 aquatic or amphibious life, the legs are not adapted for swimming 

 and there is no sign of spiracular tubes projecting from beneath 

 the seventh abdominal tergites as in the larvse. As the tegmina and 

 wings project beyond and cover the tip of the abdomen, the 

 cockroach would not be able to rest below the surface of the water 

 and at the same time draw in its air-supply through the terminal 

 spiracles as can the larvae, and I very much doubt if it can even 

 swim below the surface of the water. Dr. Annandale's remarks 

 in another letter to me on the swimming habits of this cockroach 

 are worth quoting here : — " The cockroaches were collected on a 

 very hurried trip and I had little opportunity to study them. I 

 am sure, however, that the winged form could only swim on the 

 surface. It took to the water as most, or at any rate very many, 

 of the smaller Indian Orthoptera will, if hard pressed. This is true 

 of most Acridiids and many smaller I^ocustids and I think of 

 nearly all crickets and many cockroaches, though perhaps to a less 

 extent in the cockroaches. . . .Many Indian cockroaches, especially 



