204 



0. B. HARDENBKRG. 



representatives of the genus Acanthopsyche, and diffused; 

 that on meso- and metathorax indistinct (text-fig. 18, c). 

 Body-segments with small setiferous plates bearing the primary 

 setee. The 8th abdominal segment with a small triangular 

 dark area on each side of the median line; the 9th with the 

 posterior half pigmented, while on the 10th the anal plate 

 takes in nearly the entire surface of the segment. 



The number of booklets on the abdominal and anal 

 prologs are as follows : 



We thus see that in all the specimens examined the number 

 of booklets on the prologs of the first leg-bearing segment is 

 only approximately half the normal number. Besides, as shown 

 in the figure, these liooklets are only very slightly developed, 

 especially those of the posterior row (text-fig. 18, d, e). It 

 is therefore clear that these prolog hooks are being reduced. 

 On the other hand, the number of the booklets on the anal 

 legs is remarkably constant. 



Habits of the Larva. — The behaviour of the newly- 

 hatched larva and the formation of the bag have not been 

 observed, while no data are at hand regarding the method of 

 distribution. After the bags have been made and the cater- 

 pillars are feeding they show no tendency to congregate, but 

 each leads a separate existence, feeding on the underside of 

 the leaf. Those collected on the oak in Pietermaritzburg 



