on the CEstri and Cuterebrae of various Animals. 91 



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 

 in 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 they 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 

 I 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. . 



N 2 



