9 8 NEW ZEALAND ENTOMOLOGY. 



The pupa (Fig. 8b) is enclosed in a compact cocoon, con- 

 structed of minute fragments of wood, firmly woven 

 together with silk, and attached to the inner surface of the 

 bark, where it may be soon found by careful searching, 

 and the finest specimens may thus be easily reared in 

 captivity. 



The perfect insect appears about November, and may be 

 often observed at rest on the trunks of trees ; its pale hind- 

 wings are completely concealed by the dark upper pair, 

 which render its discovery very difficult. The sexes may 

 be at once distinguished by their size, the males being much 

 smaller than the female (Fig. 8) and usually lighter in 

 colour. 



