PSYCHE. 
Ornix prunivorella Cham. 
This species, and probably most or all 
other species of the genus, like those of 
Gracilaria, to which it is so closely allied, 
assume what I have called the second form 
of larval trophi at the second moult. 
Phyllocnistis. 
In a paper in Psycue on Lnthocolletis, 
I incidentally mentioned the presence in 
Phyllocnistis of certain projections from 
the sides of certain segments of the larva, 
which, though not occupying the places 
usually occupied by legs, and perhaps not 
homologous therewith, yet served, to some 
extent at least, the same purpose, and so 
I questioned the propriety of describing 
Phyllocnistis larvae as apodal. I was 
therefore greatly surprised, on the next 
occasion when I observed larvae of this 
genus, that I could find no trace whatever 
of these pseudopodia ; then again in others 
I would find them —sometimes the full 
complement, at others only a part, and 
sometimes in the same specimen I would 
find them and then fail again. The fact is 
that they are retractile. 
I formerly thought (Psycne, loc. cit.), 
from analogy with Lithocolletis larvae that 
there were seven stages of larval life in 
Phyllocnistis, but I have not been able to 
verify this belief. On the contrary, I find 
only two stages. The mines are long wind- 
ing linear tracts, ending in a small blotch, 
which, however, remains a blotch only a 
very short time; only, indeed, while the 
larva is spinning its cocoon, which draws 
the blotch into a small knot, or pucker. 
The linear part of the mine is occupied by 
the larva in its first stage ; at least I have 
not been able to find any evidence of a 
moult while the mine remains linear. The 
67 
form of the trophi is then very similar to 
that of the earlier stages of Lithocolletis 
larvae (see Psycue, v. 2, p. 83, fig. 2). 
Having nearly finished feeding, the larva 
eats out the parenchyma next to the upper 
cuticle, making a small blotch. Although 
the rudimentary spinneret is visible, the 
silk is not yet secreted, and the larva cannot 
spin ; but resting quietly in the little blotch 
for a few hours, it then casts off the old 
skin and appears no longer a flattened larva 
with the first form of trophi, but is simply 
depressed, nearly cylindrical, and with the 
trophi as in the accompanying figure. 
These trophi are evidently not intended for 
use in eating, and in fact the larva does 
not eat any more ; it becomes rapidly cyl- 
indrical (or rather oblong conic, for it ta- 
pers rapidly posteriorly). The pseudo- 
podia are still visible, and the larva when 
removed from its cocoon ‘* bumps around ” 
on these stubs of legs, in a rather ridiculous 
manner. The spinneret and silk glands 
are now fully developed ; the larva quickly 
spins its cocoon, and in little more than a 
day after this moult it passes its second 
moult, and becomes a pupa. 
I find no material difference in the course 
of development in any of the species am- 
pelopsiella, vitigenella, vitifoliella and 
magnoliaeella. The latter species is 
known only in the larval and pupal states, 
