Plate IIIb. 
Fig, 3—Sarcoptes Scabei, yo= 
viety Canis. : 
(Male. Ventral view). 
o, Ambulacrum, 
b, Head parts, 
c, Bristles. 
ad, Segmeuts of legs. 
Fig. 4—Sarcoptes Seabei, va- 
riety Canis. 
(Ventral view of ovigerous 
female), 
a, Rostrum. 
b, Ambulacrum, 
ec, Bristle, 
da, Uterus, 
