182 C. B. HARDENBERG. 



dorsal aspect of abdoininal segments 3 to 7 clove-brown (XL). 

 Anal plate of ground colour spotted with bister (XXIX). 



Width of head-case 3 mm. Mandibles reduced in size. 

 Number of booklets on prolegs and the setal arrangement do 

 not change as compared with the previous instar. 



Habits of the Larva. 



The first act of the young larvas after emergence is to 

 construct a small conical bag. This is a silken case, covered 

 with minute particles of the parent bag. This behaviour is 

 different from that of the larva? of A. junodi, which do not 

 construct their bag until distribution has taken place, the 

 bag being formed from particles of the leaf on which they 

 have been feeding. In C. m odder manni the larvas are 

 apparently distributed after the first bag is made. These 

 young bagworms, when placed on a wattle tree, did not feed, 

 but began to spin threads, by which they let themselves 

 down and were blown by the wind. We did not observe a 

 pronounced phototropism. At first the bag remains conical, 

 then it becomes more cylindrical, but only after it has reached 

 a length of about 15 mm. does the caterpillar begin to add 

 the characteristic parallel sticks to its covering. These are 

 at first cut from the mid-ribs and pedicels of the leaves ; 

 later on pieces of the twigs are bitten off. The twigs ai"e 

 fitted closely side by side and are attached over the entire 

 length of the bag (PI. XIII, figs. 9-13) . We have not been able 

 to observe clearly the method by means of which this attach- 

 ment takes place. With one larva in the laboratory we noted 

 that the twig was severed and thrown back and attached 

 at first only at the mouth (ujjper end) of the bag, Avhile the 

 larva kept on feeding. Later in the day, towards evening, 

 we found that the inner bag had been split lengthwise at the 

 place where the new stick was situated, and the next morning 

 we found the new addition firmly in place between the older 

 parts of the bag. It thus appears that the additions to the 

 bag are made at night, and the attachment is probably done 

 from the inside. To attach a stick from the outside over its 



