326 



ARACHNOIDEA. 



CASE mites, and has much of their appearance, although also much of 



XV. ' 



that of the foregoing mouse-mites. 



Nos. Myocoptes IMUSCULINUS (Pediculus muris nmsculi, Schrank. ; Dermaleichu& 



'^' ^7' musculinus, Koch). — 16. Magnified sketch of male and female insects. 



17. Ditto of female. Both copied from Claparede's figures. 



Myocoptes musculinus (male), very minute. 

 Copied from ClapavMe. 



Myocoptes musculinus (female). 

 Ditto. 



Ditto, seen from in front. Copied from Claparede. Ditto, mouth. 



Koch, in describing this species, says that it is not abundant, 

 M. Claparede at Geneva found it very much the reverse. Every 

 mouse without exception swarmed with them in great numbers, 

 and under two forms, for the male differs from the female very 

 much. Koch appears only to have known the female. This mite 

 Claparbde found also here and there upon Hypudaeus arvalis, and 

 still more numerously upon the shrew-mouse. We have already 

 noticed under Myobia the peculiar limitation of this species ta 

 the body of the mouse, while Myobia is assigned to tTie head. 



