308 
THE CANADIAN NATURALIST 
bodies up into the air in a stiff attitude, which they main- 
tain a long time without the slightest motion^ so as to have 
a very close resemblance to a knotty twig. They become a 
naked pupa, with a mucronate tail, without any spinning. 
F, — I suspect one of these, for there are different kinds 
much alike, produces that large and beautiful Geometra, the 
Grandee Moth {Geometra Clemataria) ; but I have never 
reared it. 
C — The hairy larvae of the Buff-leopard Moth (Arctia 
Isabella) are numerous among grass and bushes. Their hair 
is close, but rather short and stiff, all black, except on th^ 
three middle segments, which are rust-red. They undergo 
the change to pupa within a cocoon. A few days ago, be- 
fore the frosts had denuded the brown ash, I shook from one 
of these trees a large and beautiful caterpillar of a Sphinx, 
larger and thicker than those of the Twin-eyed Hawk- 
moth. It was smooth and velvety, light pea-green, with 
slanting white stripes, and triangular red spots on the sides ; 
the anal horn was rough, green and pink : the fore parts 
much more slender than the hind. 
F. — I have seen a representation of this larva, in a fine 
collection of coloured drawings, made by Mr. Titian R. Peale, 
of Philadelphia, an eminent and zealous lepidopterist ; but I 
could not ascertain to what moth it belongs. 
C. — Mine went beneath the earth in its breeding-box 
in due course ; but after a few days I accidentally dis- 
covered that it was dead, with a large hole in its side, the 
viscera corrupted. My suspicions are strong against a dipte- 
rous larva which I had turned up in the ground ; a long, 
white, cylindrical fellow, with a taper head, which I put 
into the same box, not suspecting any danger. 
F, — Many of the subterraneous dipterous larvse are 
fierce and ravenous, and often prey upon caterpillars. You 
have bought wisdom by experience. 
