392 Mr. Forsayeth on the life-history of 



larva was confined. I presume they inhabited the 

 larval intestine ; or jDOssibly, like the Dracunculiis in 

 the human subject, the muscular tissues. This is the 

 only case in which I have observed such an occurrence. 



The larva, when about to change, burrows to some 

 depth below the surface of the ground, forming an oval 

 cell, the walls of which harden so that it can be dug up 

 intact, and inside which it becomes a pupa. No silk of 

 any kind is used in forming the cocoon or cell. 



The pupa is provided with a separate sheath for the 

 long maxillae, as shown in the figure ; it is of a reddish 

 chestnut-brown colour. Immediately after casting the 

 larval exuvium the pupa is of a translucent green colour ; 

 after a time the envelope hardens, and turns to a bright 

 chestnut tint. 



I bred numbers of the larvae from July to September. 

 They appeared to me to be about the commonest species 

 of Sphinx found in the vicinity, and are reared without 

 difficulty. 



ACHEEONTIIN^. 



Acherontia Styx, Westw. 

 Mhow, October 6th, 1881. 



Of two larvae figured by me, I have some doubt as to 

 which is the larva of A. Styx, as will be seen from the 

 history detailed below. 



On above date I got several of both these larvae in 

 abundance in one field of *' Tilli" (? jessamine). In the 

 whole country I found them in only this one situation. 

 That they were two distinct species of larvae I am certain, 

 having observed specimens in various stages of growth. 

 They burrowed under ground, forming cells of earth of 

 an oval shape, in which they changed to pupae ; similar 

 in all particulars to that figured. The two species of 

 larvae were bred in separate cages, and, on comparing 

 the pupae of each with the other, I could detect no 

 difierence. Before the imagines could come out I had 

 to pack u]) my specimens en route for England, and did 

 not keep the cocoons and pupce of each species distinct. 



On arrival in England I was unable to uni)ack my 

 cases until early in SejDtember. I then found three 

 imagines dead after emerging from pui)a-cases. Other 

 pupae were devoured by parasites, and two were crippled 

 in emerging, being probablj^ killed by shocks to the box 

 in which they were packed. All the imaghies, so far as 



