652 



PEOCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



The young yellowish caterpillars live together on the leaf, and eat 

 it. They gradually disperse, here and there, and feed on the matured 

 leaf, leaving the veins. When full-grown they begin to form their very 

 loose dull yellowish-grey cocoons between the leaves or on the twigs, 

 and in these they turn to hairy pale-yellowish-brown pupse which in 

 the female are very roundish without wing-sheaths or other appendages. 

 The duration of the pupal stage is from nine to fourteen days. The 

 male moths are rather active and are attracted by light. The females 

 are wingless and are very pale brownish white, covered with numerous 

 short soft hairs. They deposit their eggs in two to five days. The 

 whole life-cycle occupies from 42 days to 82 days. 



The number of generations annually of this small tussock-moth 

 in Formosa is probably six or seven, as shown in the following table : — 



This caterpillar is not active but rather sluggish, and I have never 

 seen this insect in very injurious numbers in any year. Collection and 

 destruction of the cocoons and eggs are the only efficacious control 

 measure. 



