116 PLUSIA INTEKROGATIONIS. 



upwards, being thick in proportion to its length, 

 tapering gradually from the sixth segment to the 

 head, which is smallest, the hinder segment tapering 

 but little. Viewed sideways the back of the twelfth 

 segment rises a little to the middle, and slopes rapidly 

 downwards from thence to the anal extremity, the 

 two pairs of ventral prolegs being equally developed. 



The ground-colour is a bright and deep full green, 

 but paler on the back, though the dorsal stripe is as 

 dark as the sides, and begins wide, narrows, then 

 swells wider to an angle in the middle, decreases 

 similarly, and widens towards the end, and is finally 

 edged throughout with greenish-white. This is its 

 course through all the segments except the thoracic, 

 where it is more simple and linear. 



The subdorsal line is greenish-white, finely edged 

 with darker green, and midway between the dorsal 

 and subdorsal is a tortuous line of greenish-white, on 

 which are the usual tubercular warts of the same 

 colour, eaclf bearing a fine brown hair. The sub- 

 spiracular stripe is sulphur-yellow, and the belly and 

 legs are not quite so green as the space between the 

 subspiracular and subdorsal lines. 



The head is green, finely freckled with greenish- 

 white, and having a black streak round the sides to 

 the mouth. Some very small yellow scattered tuber- 

 cles on the ventral surface. 



On the 11th June it began to spin its pale grey 

 silken oval cocoon amongst the stems of heather, and 

 a few days later the pupa became dimly visible through 

 it, lying in the middle in a nearly horizontal position, 

 the head being lowest ; its length about half an inch, 

 the wing-cases nearly as long, their tips uppermost, 

 and projecting in a blunt point ; from them the abdo- 

 men is bent downward at a right angle, having a 

 blunt anal point attached to the shrivelled coat- skin 

 of the larva; its general appearance rounded, obtuse, 

 and thick, of a blackish-brown colour, and with 

 scarcely any polish. 



