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8. HIRST — ON TWO NEW PARASITIC ACARI OF 



two of them being situated on its trochanter, one on the femur, and two on the 

 tibia, placed close together ; a single minute spinule is also present on the 

 metatarsus. The trochanter of the third leg has a minute ventral spinule. 

 Tarsus of second leg with a pair of very minute denticles or spurs at its apex 

 below. Tarsi of third and fourth legs each with a single apical spine below. 

 Colour (in glycerine, diluted with water) a pale yellowish tint. Length '87 mm. 



Fig. 1. — Leiognathus crelghtoni, Hirst, $, dorsal and ventral aspects. 



This species was found by Mr. J. H. Creighton on a young porcupine captured 

 at Nairobi, British East Africa, on January 15th, 1912. Mr. Creighton states 

 in his letter, accompanying the specimens, that they " simply swarmed on the 

 porcupine " and that " the native who skinned it complained that these parasites 

 bit or stung him like a bee, but no mark or inflammation was left."* 



* It is interesting to note that this is not the only case in which mites of this genus have 

 attacked human beings. Mr. Nathan Banks has described and figured a species (under 

 the name Liponyssus americanus) which he states was found on the arm of a person at 

 Washington, D.C. Mr. G. A. K. Marshall has kindly lent me for examination some specimens 

 of another species of Leiognathus found by Dr. W. M. Aders on human beings at Zanzibar. 

 This species was received too late for incorporation in the present note, and I hope to deal with 

 it in a subsequent paper on Acari. 



