i6 



Mites Injuj'-ious to Domestic Ammah. 



sucker of the legs borne on a long ttree-segmented peduncle 

 (fig. 2 b). 



There are two distinct species of Psorojptes, viz., P. natalensis 

 and P. communis. 



Psoroptes natalensis, Hirst, 1919. 



In the male of this species two of the hairs on each abdominal 

 lobe are distinctly flattened and blade-like near the distal end 

 (fig. 3 h), but not nearly to the same extent as the modified hairs 

 present in the same position in Chorioptes (Symbiotes). 



(a) Distal end of leg of Chorioplci, showing the ambulacral 

 sucker borne on a short unsegmented peduncle, (b) Distal end 

 of leg of Psorojites, showing the sucker borne on a long three- 

 segmented peduncle. (Original.) 



This species was first described from specimens found on cattle 

 at Richmond, Natal. Megnin's examples from a bufialo from Cochin 

 China, determined by him as P longirostris [P. coin^inniis], are 

 really referable to P. natalensis. 



Psoroptes coininunis, Fiirstenberg, 1861 



The author has examined a large series of specimens of Psoroptes 

 from various domestic animals, and can find very little structural 

 difierence between them. It seems that the mites of this genus 



