152 C. B. HAEDENBERG. 



Tristis has also a prepupal light-coloured instar, like 

 A. junodi and C. moddermanni. Larvfe were found in 

 this instar on November 24th. The colour is different from 

 that of A. alba or Gymnelema vinctus in the corre- 

 sponding- instai-. 



Length 17 mm., width of head-case 2 mm. Clround colour 

 of larva chamois (XXX). Head olive-buff (XL), apparently 

 without markings. The markings on thoracic shields and on 

 8th to 10th abdominal segments olive-brown (XL). Spiracles 

 cinnamon-i-ufous (XIV). 



The spiracles on the first two abdominal segments are 

 larger than those on the following segments, 3 to 7. The 

 spiracles on the abdominal segments are placed transversely, 

 that on the prothorax longitudinally. 



Habits of the Larva. 



Immediately upon leaving the bag in which hatching occurs 

 the young start making a miniature bag. For this purpose 

 they use the silk and small pieces of debris from the old 

 mother-bag. This first shelter is made before any feeding is 

 done, and, in fact, no part of the food-plant is used in its con- 

 struction. We removed a young larva which had only just 

 made for itself a circlet behind the thorax, put it with some 

 wattle-leaf in a glass tube which was plugged with cotton- 

 wool. The larva left the wattle-leaf and crawled up to the 

 top of the tube, where it utilised strands of the cotton- wool 

 to complete its bag. The process of making this first bag 

 occupied between two and three hours. Only after this bag- 

 had been made did the larva start to feed on the wattle-leaf 

 supplied, and it then used small particles of this to make 

 additions to its bag. 



During this first stage the larva? are positively phototropic, 

 like those of A. junodi, the instinct being developed in con- 

 nection with dispersal. Later on, especially towards the time 

 of pupation, they show a tendency to conceal themselves, as 



