114 STATES OF INSECTS. (Larva.) 
is the case with the subcortical one from Brazil lately 
mentioned. It is more commonly longer than broad ; 
but in some, as in the larvee of carrion beetles (Silphe), 
the reverse of this takes place. Its shape varies from 
triangular to orbicular, the mouth of the animal forming 
the vertex of the triangle. In some larvae of Hemerobiz, 
however, the head is narrowest behind. That of the grub 
of a gnat noticed above (Corethra crystallina) forms a 
kind of sharp horn or claw, terminating the body ante- 
riorly*. The contour of the head of larve is usually 
intire and unbroken; but in the caterpillars of some Lep- 
doptera, as the butterfly called the grand admiral (Vanessa 
Atalanta), the Glanville fritillary (Melit@a Cinzia), &e. 
it is divided into two lobes». In the Brazil flat larvee it 
is trilobed, each lateral lobe being divided into three 
smaller ones: in which circumstance it somewhat resem- 
bles the head of some subcortical bugs (Aradus, &c.). 
Although the part we are treating of is generally with- 
out horns, yet in some tropical butterflies it is singularly 
armed with them. Thus Papilio Anchises is distin- 
guished, according to Madame Merian‘, by two in the 
occiput, which it has the power of retracting. In the 
purple highflier (Apatura Iris), a British species, the 
two lobes of the head, I am informed, terminate behind 
in two horns; as they do likewise in the brilliant Morpho 
a Reaum. v. ¢. vi. f. 7. 2. ¢. 
>In fact, in almost all Lepidopterous larva the head may be re- 
garded as divided into two lobes or eye-shaped portions, which in- 
clude in the angle formed by their recession anteriorly from each 
other, the nasus (c/ypeus F.), the labrum, and other instruments of 
manducation. Posteriorly these lobes generally come into contact; 
but I have aspecimen in which there is a narrow space between 
them. 
¢ Ins. Surinam, t. xvii. 
