PARASITIC ACAEI. 235 



In the varieties ovis and caprae it is about the same length as 

 in var. cuniculi. 



When the locality is not mentioned in the list of measurements 

 given below the specimens are European. 



Locality : Colorado. Var. cervinae. 



Length . . 515-675 /i — 515-570 fi 



Width . . — — 330-370 fi 



Var. from Ibex (locality unknown : Btirrows Coll., Lister Institute). 



Length . . 740 /^ (one specimen only) 



Width . . 4:15 II 



