Warr.—Leaf-mining Insects of New Zealand. 631 
and January, mentioning particularly The Hump, Billow Mountains, Hunter 
Mountains, Wakatipu generally, Takitimu Mountain, Manapouri region ; 
very sparingly on the Dun Mountain, Nelson. Imagines best caught by 
beating in vicinity of food-plant, but may quite easily be reared from 
cocoons. s were collected on 20th August, 1921, and imagines 
emerged from 9th to 30th September, the greatest number emerging on 18th. 
Food-plant 
The silver southern-beech; Nothofagus Menziesii (tawhi, tawai). 
Nothing at present known. Egg-laying. 
The Mine. 
Characteristics not yet definitely known, but amongst leaves on branch- 
lets holding cocoons were many containing empty narrow galleries on 
underside of leaves ; there is no sign whatever of these galleries on upper 
surface ; mines shallow, and dry cuticle over them had a silvery appear- 
ance; it would appear that larva mines more than one leaf. In other 
leaves part or all of leaf-substance had been removed, leaving only the 
two dried cuticles much wrinkled, the under one contracted so as to cause 
leaf to curl, and in it was the hole by which larva left ; hollow within leaf 
contained a small amount of fine black granular frass. It would seem safe 
to assume that the larva does not confine itself to one leaf, that the mine 
is at first a narrow gallery on underside of leaf, and finally the larva 
blotches entire leaf and possibly more than one. Mines should be looked 
for during August and November. 
The Larva. (Text-figs. 16-20, and Plate 67, fig. 7.) 
Full-grown larva, prior to pupating, about 1 cm. in length ; pale cream 
to white, with a narrow pale-green dorsal streak ; head pale grey, sutures 
darker brown, tubercles and setae colourless. 
Head with setae shown in figures, which were taken from a specimen 
cleared in potash and mounted without pressure. Mandible and eyes are 
shown in figs. 19 and 20. 
