SECOND REPORT ON ECONOMIC BIOLOGY. 



The number of eggs placed together varies, and in one case a 

 female was observed to place eleven eggs under a projecting piece of 

 bark, taking several minutes to complete the operation. In other 

 cases the eggs were laid singly, or in groups of three or four. In the 

 case of the larger groups no attempt at arrangement of the eggs was 

 noticed. 



The egg (Fig. 9) is elongate-oval, a little broader at one end than 

 the other, white in colour and devoid of any markings. Length 

 1.6 mm., breadth at broadest part 0.45 mm. 



FiG. 11. PUPA, dorsal view. 



FIG. 12. IMAGO (female), dorsal view. 



After hatching the larva bores through the bark and commences 

 to eat a narrow channel between the bark and the wood, eating about 

 equally of each, so that the markings can be seen as well on the bark 

 as on the wood. As it grows in size, it eats a gradually widening 

 passage, which it leaves full of bore dust. Where there is only one 

 larva at work on a piece of timber its course is easily followed and the 

 markings are definite (Fig. 14), but where several are working 

 together they cross and recross their own or other borings (Fig. 13) 

 so that the markings of each are only traced with difficulty. 



When the larva is about half-grown it is not content with eating 

 directly in front of it, but turns to the right and left, eating out large 

 sinuses still between the bark and wood, and always within the limits 



