Warr.—Leaf-imining Insects of New Zealand. 675 
Food-plant. 
The silver Southern- beech, а dr ies Menziesit (tawhi, tawai), known 
h," ," and “silve 
Auckland district in the North Island, being found on Mount Ruapehu 
but not on Mount Egmont. 
Ovum and Egg-laying. 
Ova laid singly and well attached, persisting more or less undamaged 
long after lava has vacated mine. Egg occupies an almost — cee 
on upper surface of leaf, close to or зк ge midrib, rarely more than } in. 
from junction of stem and leaf. res a have not yet been н апа 
the following description is taken from op shells: Class flat (?) ; shape 
Fic. 1. — Typical mines of N lucida in leaves of kr ia dee Menziesii. 'The white 
line in the expand ded terminal portion indicates the courseetaken ы the 
larva in formation of the blotch. (С aaa edie sketches. ) 
oval, well rounded above, wafer-like, a slight fringe round outer margin 
of 
strong, transparent, shiny, white, becoming more or less filled with frass- 
granules as soon as larva commences mining ; average dimensions, 0-36 mm. 
by 0-26 mm. 
The Mine. (Fig. 1.) 
A small narrow more or less tortuous gallery. In its first part it is carried 
line of minute irregular pale-coloured spots, very much the same as in the 
case of N. fulva. Remainder of mine close against upper cuticle, and entire 
course of gallery is plainly discernible on both surfaces of leaf. Colour 
dark grey to brown, but not conspicuous, chiefly owing to small size. From 
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