524 Oil Ttoo neio Parasitic Mites. 



pocket behind tho antitragal ridge * ; 



skull short and high ; inner portions 



of upper ?jji and m" slender and weak ; 



last lower molar without median 



external cusp ; (upper lip grooved ; 



metatarsus hairy down to plantar 



pad : hallux absent). 



i. Pollex retained Cynktis. 



{'. Pollex suppressed Pnracynictis. 



LIII. — On Tw-^ neio Parasitic Mites (Myocoptes hintoiii 

 ayid Psoroptes natalensis). By STANLEY HiRST. 



(Published by permission of the Trustees of the British Museum.) 



Myocoptes hintoni, sp. n. 



? . The minute little scutum (at the extreme anterior end 

 of the dorsum) angular pcsteriorly in the middle, but not 

 ending in a slender, median, spine-like process, as in M. mus- 

 culinus, Koch, and M. tena.v, Michael. The new species can 

 also be readily recognized by the four very long hairs (a pair 

 on each side) that are present (on the venter) at the posterior 

 end of the body, instead of only two long hairs in this position 

 (one on each side), as in M. musculi, M. tenax, etc. 



Length of body 340 /i, its width 170 /i. 



Host : English Squirrel (Sciurus vulgaris), Exeter, October 

 1918. 



Psoroptes natalensis, sp. n. 



(J . Second hair from each side on abdominal lobe fairly 

 long and shaped like a very fine lance, the distal half being 

 distinctly flattened (blade-like), instead of cylindrical as in 

 P. ovis, P. caprce, P. cunicxdi, P. equi (and also P. hovis, 

 according to Berlese's description and figure). Middle hair 

 on lobe long and fine. Outermost hair quite short. Inner- 

 most hair very fine and comparatively long. 



Length of body (including capitulum and posterior lobes) 

 420 fjL, its toidth 290 fx. 



Material. A number of specimens found on cattle at 

 Richmond, Natal, 1896 (C. D. Soar's collection). 



Note. — In the genus Chorioptes (including C. bovis) the 

 central hairs on the abdominal lobes of the male are modified 

 in much the same way as in this new species, but the flat- 

 tened portion is very much wider and the pedicles of the tarai 

 bearing the pulvilli are quite short instead of elongated and 

 segmented, as in Psoroptes natalensis^ etc. 



• The characters of the feet and ear need verification in the case 

 of Pnracynictis, only dried skins of the genus being available for 

 examination. 



