86 Mr. Clark's Appendix to a Treatise 



This male being found in wild places and on heaths where cattle frequent in 

 summer, is perhaps awaiting the appearance of the female flies a little later in 

 the season. If this be true, it will reduce the genus by two species, and ren- 

 der it more clear, simple and appreciable. I possess numerous specimens of 

 this CE. " ericetorum" and on examining them, find the termination of the 

 abdomen in all of them without any stylus, see Tab. I. fig. 30, 31, of my 

 "Essay," and conceive them, therefore, to be all males. I may further ob- 

 serve, that in my later description of this insect, I was led at that period to 

 conjecture that this fly might possibly be the male of CE. Bovis, but ,dared not 

 affirm it, since Dr. Leach assured me he had one specimen in his collection 

 with a stylus, which I now regard as a mistake ; and having but little time to 

 give to these pursuits, I left the subject in a doubtful state. It is necessary 

 to add that fig. 31. of my treatise (where this insect is represented with a sty- 

 lus to the abdomen) was given solely on the authority of Dr. Leach. 



Having thus expunged two species, I shall proceed to obliterate a third, the 

 CE. Pecorum of Fabricius. Although some sort of grief, trouble or suffering 

 appears to be allotted to every animal in the creation in its present condition, 

 we have yet to learn that any naturalist, butcher or other person among the 

 Laplanders has seen the larva of any CEstrus in the nose or fauces of these 

 animals. The stag has them, it is true, in the throat, but then he has no in- 

 fliction on his back or stomach ; and no animals appear to be tormented in 

 both ways. However, let search be made as to this supposed nose- hot, which 

 will be very easily done on the spot. It is true there are four species belong- 

 ing to the horse, but they are all confined to one part only, viz. the stomach. 

 As to the insect which Fabricius describes, it is pretty clear to me, if any one 

 could show a specimen of it, which I never yet saw, that it would prove to be 

 no other than a dark-coloured variety of the CE. veterimts of my enumeration 

 (a colour they often assume), and answer to his description sufficiently well. 



I am almost sorry to commit such havoc as to destroy a fourth species 

 which I do with the more regret, as it was designed to do me honour and to 

 bear my name. This is another species of Dr. Leach's creating (see CEstrus 

 Clarkii, ' CEstrideous Insects,' p. 2), which, on examination at the British Mu- 

 seum, where it is still to be seen so ticketed, proved to be no other than a 

 very light-coloured variety of my (Estrm veterinus, called by mistake nasalis 



