334 Transactions. 
to mine to one side of it. Duration of the second stadium, about three 
weeks. The positions of the moults can easily be found in old mines by 
removing the leaf-cuticle under a dissecting microscope and searching for 
the easily-found cast head-capsules. The larva ceases feeding for two or 
three days prior to each moult. The third and final moult takes place 
within the cocoon at the time of pupation. Duration of third stadium, 
about four weeks. The transition from gallery to blotch in the third 
stadium is quite gradual, not abrupt, the blotch being only the expanded 
terminal part of the gallery. This is best seen in mines in the leaves of 
the Celmisia, for in Olearia the coarse network of veins causes the blotch 
to be composed of incorporated portions of the earlier gallery. 
Average length of larva at end of first stadium, 3 mm.; at end of 
second stadium, 5 mm.; when fully grown, 8 mm. The final act of the 
larva is to construct the cocoon within the blotch. Larvae appear to 
hibernate during their first instar, or else within the cocoon before 
pupating. Larvae are most plentiful in J. anuary, August, and November. 
The Larva. (Plate 29, figs. 3-8.) 
tapering caudad. H tractile, very dark grey to black. Prothora: 
possesses a black dorsal shield only lightly chitinized along mid-line; it 
also possesses a pair of small black ventral plates. Abdominal segments 
absent over apices of segmental protuberances; on dorsum of each seg- 
ment the skin between these plates is more. chitinized than elsewhere, 
apparently in minute ridges radiating out from the plates; this extra 
thickening occupies a definite saddle-shaped area on- dorsum directly 
e chaetotaxy is very difficult to determine, owing to the minuteness 
of the setae; in the figure these are greatly exaggerated. Alpha is placed 
ow beta in prothorax, but in all other segments beta appears to have 
been pushed directly ventrad to alpha by the fleshy protrusion before 
Saas І 
