ARACHNIDA. 265 
The varieties occurring on the horse (equi), on cattle (bovis), and on 
the goat (capre), are considered certainly as belonging to the one 
species, while there is some question as to the form occurring on sheep, 
mentioned later, and on the rabbit. 
) 
—— 
‘al 3 
Fia. 157.—Myocoptes musculinus: a,male; b,female; c,front view; d,mouth (copied from Murray’s 
; figures after Claparéde). 
Le The variety occurring on goats is credited with having ravaged the | 
goats,in the Grisons, in the valley of the Prattigau, Switzerland, in Re 
& Fic. 158.—Chorioptes symbiotes (male); a, anterior leg, showing suckers (after Furstenberg, copied 
{ from Murray). 
1851, 1852, and 1853, when out of 2,500 animals half were attacked and 
500 died. 
Evidently the dipping treatment will prove the most effective for 
these parasites. 
