126 THE ENTOMOLOGIST’S WEEKLY INTELLIGENCER. 
I do not propose to weary this section 
with going into details as to all the ex- 
ceptions to the normal form, but a few 
instances may advantageously be given 
in some detail. 
Thus, for instance, in the genus In- 
curmria, the larvae, which live in flat 
cases, something like oyster-shells, formed 
of two pieces of leaf of an oval form, cut 
out and fastened together with silk, have 
a slight hump on the eleventh segment, 
but do not show any other peculiarity. 
These larvie in crawling about only exsert 
the four first segments from tbe case, — 
the segments which are ornamented with 
markings, — the rest of the body remains 
inside the case, which, being compara- 
tively of unwieldy size for tbe small 
larva within, cockles over directly the 
larva attempts to drag it after it, and the 
hump on the back of the larva is probably 
found serviceable in retaining the case 
on the body. All case-bearing larvae 
have a great repugnance to quitting the 
cases, and many readily allow themselves 
to be pulled in two rather than quit their 
domicile. 
In the genus Coleophora, of which the 
larvae also live in cases, we do not find 
any trace of the hump we see in In- 
curvaria; but then the cases are usually 
cylindric and not disproportionate in size 
to the larvte, and the larvae consequently 
carry them about with more ease. One 
instance does, however, occur in that 
genus, in which the larva assumes so 
droll a form that it strikes me as the 
most grotesque-looking Micro larva which 
I have yet seen. 
The larvae of Coleophora: feed either on 
the leaves or on the seeds of plants; 
those which feed on the leaves mine be- 
tween the cuticles, eat out the paren- 
chyma, and then construct of the pieces 
of cuticle a case, though sonic larvte con- 
struct their cases entirely of silk. Those 
which feed on the seeds of plants also 
frequently construct their cases of silk ; 
but a few, more economically disposed, 
on eating out the contents of a seed or 
seed-pod, take possession of it as a ready- 
formed case. Thus the larva of Cole- 
ophora leucapennella^ which feeds on the 
seeds of Silene nutans, takes possession 
of a capsule of that plant, and treats it 
exactly as though it were a case of its 
own manufacture : the fonn of this cap- 
sule is of course well known to most of 
those present, and they will readily ima- 
gine that it would not be at all suitable 
for a larva of a cylindric form ; but, in 
point of fact, it is only the anterior seg- 
ments of this larva which present us 
with the usual form, its hinder portion 
being much swollen out and enlarged, so 
as to fill the inside of the capsule, or 
nearly so. 
The next form of larva to which I 
would direct your attention is far more 
abundant than those of which I have 
just spoken. In the genus Antispila the 
cylindric form is considenibly departed 
from, these larva; being much flattened 
both above and below, with the segments 
deeply iucised, and, moreover, they are 
utterly destitute of legs. The larvae both 
of Incurvaria and Coleophora have the 
normal number of legs, sixteen, and 
though the prolegs are rarely well de- 
veloped in case-bearing larvae we can 
still readily count them. In the larva; 
of Antispila we see no trace either of legs 
or prolcgs: these larvae mine blotches in 
the leaves of dogwood, and when full fed 
they cut out an oval case, in which they 
descend to the earth, but they never quit 
the case, nor have occasion to crawl 
about with it, so that they do nut require 
legs. 
In the larva: of the genus Lithocollelis 
