91 
on the CEstri and Cuterebree of various Animals. 
also placed near to the two respiratory plates. The head too of the fly is 
always contained in the narrow end of the chrysalis, contrary to its position 
m most other insects, as may be seen in my Treatise, pi. 2 . fig. 7 . A real 
Cuterebral larva is figured also in my enumeration, pi. 2 . fig. 24, which seems 
too dissimilar to be of the same genus. 
Another statement, somewhat hostile to my conclusions, which is perhaps 
deserving of notice, has also appeared in the ‘Entomological Magazine,’ No. 23. 
p. 33, renewing the old doctrine of the fatal effects of these larvae, and of their 
eating or boring holes through the coats of the stomach of the horse, and 
stating, in supposed opposition to my opinion, that they really feed on chyle, 
and not on the green contents of the stomach. My answer to these remarks 
was given in the succeeding number of the same Magazine. 1 readily ad¬ 
mitted that t hey fed on chyle, for such had ever been my opinion and was 
plainly stated as such in my works; but as to their boring propensities, these 
1 could not acquiesce in, since they possessed no teeth nor other instruments 
of any kind by which they could possibly achieve any such intentions. Neither 
did I believe their instinct to be of so fallible a character as to permit them to 
gnaw away and destroy their own standing, and so let themselves fall through 
the openings they had made into the cavity of the abdomen, there miserably 
to perish, for from thence there was no outlet or escape. I thought this short 
announcement might help to suppress any suggestions of this kind in future, 
as such ideas had been very general, and were industriously entertained and 
spread. A preparation of a horse’s stomach, so “gnawed” by the bots used 
to be exhibited at our Veterinary College, as supporting this vulgar opinion ; 
but on a more scrupulous examination of it, it turned out that the stomach 
had been suffered to get putrid and tender, and then the bots had been thrust 
by some one, some half, some a quarter, and some wholly through the coats of 
the entire stomach : it has been since destroyed, at least it is no longer to be 
seen there. 
Having somewhat diminished the numbers of this active family at the 
commencement of my paper, I shall now proceed to repair the loss in some 
degree by the description of three species, not described in my enumera¬ 
tion, which the kindness and industry of my entomological friends have since 
supplied. 
