Warr.—Leaf-mining Insects of New Zealand. 337 
Distribution. 
First found as noted in the Botanical Gardens, Wellington. The larvae 
were obtained on 8th August, 1919, and commenced pupating during the 
first week of October, the imagines emerging from 20th October till 1st 
December, 1919. А plentiful number of mines and full-grown larvae were 
found at Wanganui on 26th September, 1921, and again at Wellington 
during the same week. I have received one doubtful specimen of the mine 
from Mr. Philpott at Nelson, 29th December, 1921. 
Food-plant. 
Polypodium | serpens (Cyclophorus serpens), a small thick fleshy-leaved 
tree-climbing fern, common throughout New Zealand. _ 
The Ovum and Egg-laying. 
Nothing at present known. 
. The Mine. (Plate 28.) 
mine in its earlier stages is a narrow gallery, commencing as a 
rule near base of leaf and in genera ing alon i From this 
e found on under-surface. e galleries cross each other in all directions, 
and the cuticle covering them very soon becomes light brown in colour, 
that over the final blotch becoming dark brown to black; frequently the 
surrounding leaf-substance dies and blackens, and masks the actual size of 
the blotch. Margins of galleries are even and parallel. Central portion 
of leaf is always the most mined, and the midrib offers no barrier whatso- 
ever. It is rare to find more than one larva in a leaf. Frass is coarsely 
ular, dark green or brown to black in colour according to age, and is 
irregularly distributed throughout mine. 
The Larva. (Plate 31, figs. 4—11.) 
pare 
Tubercles small, green; setae light grey. Skin covered with minute pile 
except in vicinity of tubercles. Thoracic legs normally developed; prolegs 
on segments 3-6 inclusive and 10; ventral prolegs possess complete circles 
of 16-18 crochets each, the anal prolegs possess only a semicircle of 10-12 
crochets each. Spiracles small, circular. 
