186 DISEASES OF THE SKIN. 



80 little damage do they appear to have occasioned in 

 former periods. In a valuable paper, containing the 

 result of observations made on this subject in the 

 Highlands, and published in the second number of the 

 Quarterly Journal of Agriculture, they are thus 

 described : — 



*• The fly which is the immediate cause of this dis- 

 ease, seems, as far as my observations could extend, to 

 consist of four species, viz. — the Musca Ceasar, Cada- 

 verina, Vomitoria, and Carnaria, of Linnaeus. * * ♦ 



" M. Ceasar is of a shining green colour. 



" M. Cadaverina, the thorax shining bluish, the 

 abdomen green, like the Ceasar. 



" M. Vomitoria, thorax black, or dark-blue grey, 

 abdomen dark glossy blue. This is the common Blue- 

 Bottle or Flesh-fly. 



" M. Carnaria, grey ; the thorax has three black 

 longitudinal markings on the upper surface ; the abdo- 

 men is checquered, in some positions shining whitish. 



** In all those instances in which I observed them, 

 the green flies were the first to attack, and this is the 

 common opinion among the shepherds. After a time, 

 when the larvae (maggots) commenced gnawing the 

 flesh, the putrid stench, which was thereby occasioned, 

 attracted numerous other species. The Vomitoria 

 {blue-bottle) was very common, more numerous than 

 both the former species, and perhaps contributed most 

 to accelerate the death of the animal, after the others 

 had commenced. The Carnaria was rare. I observed 

 but few of them, and these seemed not concerned ; 

 which is the more remarkable, as in the fenny counties 

 of England it is said to be most troublesome. All th# 



