5*4 



THE ANIMAL PARASITES OF MAN 



feet. It appeared that the disease was caused by its burrowing 

 beneath the thick cuticle. The disease was attributed to the 

 wearing of a pair of shoes which had been lent to another negro 

 whose feet had been similarly affected for nearly a year. The negro 

 to whom the shoes were lent came from Sierra Leone. Mr. Busk 

 stated that some water brought by Dr. Stranger from the River 

 Sinoe, on the coast of Africa, contained one nearly perfect specimen, 

 and fragments of others very similar to if not identical with this 

 Acarus. Mr. Busk adds that he had been informed by Staff- 

 Assistant Surgeon P. D. Murray that at Sierra Leone there is a 

 native pustular disease called craw-craw a species of itch breaking 

 ' into open sores. 



[From Busk's original figure I see no reason to doubt that this 

 is a Glyciphagus. F. V. T.] 



Genus. Rhizoglyphus, Claparede, 1869. 

 Rhizoglyphus parasiticus, Dalgetty, 1901. 



The Rhizoglyphii are to be recognized by their short legs, which are beset 

 with spines, and by the tarsi, which terminate in a claw. They live on plants, 

 roots and bulbs, especially the bulbs of lilies. 



FIG. 365. Rhizoglyph*4s parasiticus. a., male ;., female. Enlarged. (After Dalgetly.) 



This species has been observed on the feet of Indian coolies 

 working in the tea plantations; they produce a skin disease 

 which always commences with blebs between the toes, and which 

 almost always extends to the malleoli. but not beyond. The 



