SOLIDUNGULA 389 



account of cases of lousiness due to Hcematopinus I am indebted 

 to Mr S. Butters. As regards the scab, itch, and mange 

 insects or mites (Acaridce), three perfectly distinct forms are 

 known. Adopting M. Megnin's classification they are Scar- 

 coptes scabiei, var. equi, Psoroptes longirostris, var. equi (being 

 the Dermatodectes equi of Grerlach), and Chorioptes spathiferus, 

 var. cqui, which is the Symbiotes equi of Gerlach. All the 

 species have been beautifully illustrated by M. Megnin, whose 

 memoir has dispersed many of the clouds of error and mis- 

 representation which have hitherto surrounded the subject. 

 Whilst Psoroptes forms the true horse-mite, and attacks various 

 parts of the body, Chorioptes confines its attacks to the posterior 

 regions. Messrs South and Day and myself have verified 

 some of the facts recorded by Megnin in respect of the struc- 

 ture and habits of this last species. Another kind of mite 

 (Glyciphagus hippopodos) is stated to infest the ulcerated feet 

 of horses. It would appear that no true ticks properly belong 

 to solipeds ; nevertheless, the common cattle-tick (Ixodes bovis) 

 occasionally attacks horses. Probably several other species of 

 IxodidsB, known to infest other animals, behave in the same 

 way. The Arachnidan called Pentastoma tcenioides, though 

 properly belonging to the dog, has on several occasions been 

 detected in the nasal or frontal 'sinuses of the horse. Such 

 instances are recorded by Chabert and Greve. The largest 

 example of this singular entozoon seen by myself was obtained 

 from the same situation, and presented to me by the late 

 Mr C. B. Eose, whose writings I have frequently quoted in 

 connection with the Coenuri of rabbits. 



BIBLIOGRAPHY (No. 50). Aitken, /., " Worms in the Sper- 

 matic Artery of a Colt," ' Veterinarian/ p. 683, 1855. Ander- 

 son, J.j "A Case of Strangulation of the Ileum (with Lumbrici)," 

 'Veterinarian/ p. 261, 1859. (Anonymous), " Eupture of the 

 Stomach, associated with the existence of Cysts between its 

 Coats containing Worms/ 7 ' Veterinarian/ March, 1864, p. 151. 

 (Anon.), " Extraction of Filaria oculi from the Horse," by 

 "Miles," ' Veterinarian/ 1864, p. 218. (Anon.), "Case of 

 F. oculi in the Horse," ( Veterinarian, 7 1864, p. 218. (Anon.), 

 " Worms in the Coats of the Stomach of a Horse," by "Argus," 

 in the ' Veterinarian/ 1865, p. 151. Baird, W., "Notice of 

 Sclerostoma in the Testicle of the Horse," ' Proc. Zool. Soc./ 

 1861. Blanchard, " Anoplocephala perfoliata," 'Ann. des Sci. 

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