33 
Larvas ; if they did, it is probable they would lose their hold, as* 
the hooks are principally connected with the skin, and separate 
with it by maceration, leaving an indentation where they were 
lodged. 
These Larvae have the power, when compressed or squeezed, 
of contracting and hardening themselves, and it is probable they 
in this way resist the violent pressure they must occasionally 
sustain, from the weight of the food and the actions of the 
stomach, and in passing through the intestines and the sphincter 
ani. 
After remaining in the chrysalis state about two months, the 
Fly appears.—See fig. 12 and 13,—the male and female,—and 
their description in the sequel of the paper. 
This species may still retain the name of Haemorrhoidalis, with¬ 
out any impropriety, not from the supposed history of its enter¬ 
ing the anus, but from the termination of the abdomen being 
red, Linnaeus having generally chosen to distinguish the insects 
so marked by that name ; also from their resembling the haemor¬ 
rhoids or piles, while hanging to the extremity of the rectum. 
The learned Charlton, (Onomasticon Zoicon, p. 56,) and after¬ 
wards Dr. Johnson, (see Dictionary,) have considered ascarides as 
the synonymous term among the ancients for the Bots : that term 
has ever been applied to the thin smooth worms of the intestines, 
but, I apprehend, never to these. 
On the Oestrus Veterinus, or Red Bot. 
The mode of this insect depositing its eggs or nits, is at pre¬ 
sent unknown. By watching for them on the commons in the 
warm days of the sixth and seventh month, (or July and August,) 
it might be detected, I apprehend, without very great difficulty. 
They perhaps deposit them about the lips or legs, as the former 
species, The Larva of this species is also not certainly known. 
i 
