180 STATES OF INSECTS. ( Larva.) 
as entirely to conceal the body of the animal, as in the 
case of the Brazil one lately mentioned, yet generally 
speaking, even when they are most numerous, they per- 
mit the skin to be distinctly seen. Their arrangement 
is various, though always orderly: in the majority they 
are planted singly, but in some caterpillars in bundles. 
In that of Saturnia Io, on each segment there are six bun- 
dles of longish, quill-shaped, sharp, slender, diverging 
spines, which also appear to sheath aculei. Madame 
Merian has figured this larva, or one very near it, as the 
grub of a Euglossa*, with which, though she affirms she 
traced it to the fly, it can have no connection. With re- 
gard to number, some larvee have only four spines on 
each segment; others five, others again six, and others 
seven, or even eight: they are planted on the sides and 
back only, never on the belly. They are often more nu- 
merous on the intermediate than on the anterior and 
posterior segments; but sometimes the reverse of this 
takes place; in that of Attacus Erythrine only the head 
and tail are armed with spines, the rest of the body being 
without any>; and in that of Morpho Teucer there is 
only a single spine on the four intermediate segments °. 
They are usually all nearly of equal length; but in some 
cases those of the head and tail are much longer than 
the rest, and remarkably,so in the caterpillar of Urania 
Leilus, also beautifully plumose, and gracefully waved . 
Those in the second and third segments are much longer 
than any of the rest in that of Ceracampa regalis ; which 
circumstance gives it the terrific appearance lately al- 
luded to. In the family to which Argynnis Paphia be- 
* Ins. Sur. t. xlviii. right-hand figure. > Tbid. t. xi. 
* Ibid. t. xxiii. @ [bid, t. xxix. 
