3o8 



ARACHNOIDEA, 



CASE PsoROPTES EQUi {Gerv., Ann. Soc. Nat. 1841), the horse and sheep itch 

 ^^- insect (Dermatodectes equi, Gei'l. ; Dermatodectes bovis, Gerl. ; Der- 



matodectes ovis, Gerl. ; Dermatokoptes communis, Furst.). — 9. Mag- 

 nified sketch of male, upper side. 



Mandibles of Fsoroptes equ 

 Copied from Furstenberg's figure. 



Ditto anterior leg and suckers. 

 Copied from Furstenberg. 



Furstenberg shoves aside 

 the old names with rather too 

 much nonchalance. If every- 

 one were entitled to change 

 a name merely because he 

 thought he could give it a 

 better or more appropriate 

 one, there would be no end 

 to new names. Or if every 

 time that a specific name was 

 picked off, the generic name 

 that accompanied it must go 

 too, matters would be still 

 worse. It seems a very ques- 

 tionable step to change the specific name equi into communis, 

 merely because the insect has been found on other animals besides 

 the horse j and the substitution of his new generic name (Dermato- 



Psoroptes equi. Copied from Furstenberg's figure. 

 (Striation on body not sufficiently fine.) 



