1903.] E. P. Stebbing— Life-history of Arbela tetraonis. 257 



time spent as a feediug larvae, the number of eggs laid, and the time 

 spent before they hatch out. 



In addition to the scientific instinct which attaches to the taking of 

 this insect and to the study of its life-history both, owing to the little known 

 about the habits of the family, of some importance there is another aspect, 

 the economic one, which is equally deserving of attention. The Casua- 

 rina has been planted, and is being planted, in Madras with two objects 

 in view ; the one, to protect the cultivated lands or towns and villages, 

 roads, &c, from the encroachments of moving sand dunes, and secondly, 

 to provide timber and fuel for the inhabitants in areas where the only 

 other tree growth is palm trees. The action of the larvae of this moth 

 by which trees are often killed off and plantations or portion of them 

 ruined is therefore of some importance. 



