174 STATES OF INSECTS. (Larva.) 
hollow, though not to the apex: probably this is the case 
with those of other larvee, as well as with their spines. 
In this instance they were set, he observes, in a corneous 
ring, or very short cylinder, elevated a little above the 
skin. The hair passes through this ring, and appears to 
be rooted in a soft integument, which clothes the skin 
within, and upon which the nerves form a reticular tis- 
sue, some of which he thinks he has even seen enter the 
root of the hairs, which perhaps are organs of touch. 
Of the pilose larvee, some, like most of those of the 
smaller moths (Geometra, Tortrix, Pyralis, &c.), have 
merely a few scattered short hairs, scarcely perceptible 
except through a lens: others (Odenestis potatoria, La- 
siocampa Rubi) are covered with down more or less thick: 
in others (EZriogaster lanestris, Trichoda Neustria) the 
hair is slenderer, and more like wool; the body of two 
species which I purchased from the collection of Mr. 
Francillon is covered with woolly hairs, so long as to 
give them the appearance of a shock-dog; and Madame 
Merian has figured a similar one, which she could not 
bring to the perfect state’. The hairs of many Bomby- 
cid@, known commonly by the name of hairy caterpillars, 
as Spilosoma erminea, &c. are stiffer, resembling bristles ; 
sometimes, asin Arctia chrysorhcea, mixed with shorter 
ones. The hairs either spring immediately from the skin 
(Apatela leporina), or, as is more general, proceed only 
from certain tubercular elevations, usually subhemisphe- 
rical, but sometimes conical; of which a number varying 
from four to twelve are found on each segment of diffe- 
rent species. They seem to issue from these tubercles, as 
little diverging streams from the rose of a watering-pot. 
* Lyonnet 69-.-. > Surinam. t. lvii, right-hand figure. 
