232 STANLEY HIRST ON PARASITIC ACARl. 



aperture situated laterally (on each side) between the first and 

 second pair of legs. Posteriorly the tubes apparently do not 

 join with one another, terminating separately near the anus. 



B. Note on the Two Valid Species of the genus Psoroptes 



(P. NATALENSIS AND P. COMMUNIS). 



Apparently there are only two valid species of Psoroptes 

 (P. natalensis mihi and P. communis Fiirstenberg). They 

 differ from one another in the shape of the hairs on the abdominal 

 lobes of the male. The author has not been able to examine 

 specimens of Psoroptes gazellae Canestrini (off Gazella sp., locality 

 not known) and so cannot say anything about this form. The 

 measurements in this note have been made with a No. 2 " stufen " 

 micrometer ; the drawings were done by Mr. Percy Highley with 

 an Abbe camera lucida. 



Psoroptes natalensis Hirst. 



Psoroptes natalensis Hirst, Ann. Mag. Nat. Hist. (9), iii, 1919, 



p. 524. 

 Hirst, Ann. Mag. Nat. Hist. (9), vii, 1921, p. 39. 



In Psoroptes natalensis mihi the middle hair on the abdominal 

 lobes of the male is long and fine ; the hair on each side of it is 

 also long, but the distal half is slightly flattened (blade-like). 

 This species can be easily recognised by these two modified hairs. 

 The outer hairs on the lobes are quite short. 



This mite has so far only been found at two localities, viz. 

 (1) Eichmond, Natal (mounted specimens presented to the 

 British Museum, Nat. Hist., by Mr. C. D. Soar) ; (2) at Paris 

 on a buffalo in the menagerie of the Museum (specimens mounted 

 by P. Megnin, kindly lent the author for examination by Dr. M. 

 Langeron, of the Laboratoire de Parasitologie, Paris University). 



Measurements. 

 Ovigerous Pubescent 



