— 138 — 



0,71 mm. in width. All these characters are very similar to 

 the description of my female specimens given above. And 

 lastly, the affinity of the hosts of the parasites (Linstow's 

 specimens were found in the lizard Stellio vulgaris L a tr. 

 in Egypt) as well as their geographical distribution givefurther 

 support to the supposition of their zoologic identity. The 

 only striking difference is the dimension of the eggs which 

 reach 0,132 mm. in length, and 0,067 mm. in width with 

 L i n s 1 w, as compared with my measurements: 0,096 — 

 0,105 mm. length, and 0,06 mm. width. However, this difference 

 is notsufficient to separate my parasite into a distinct species. 

 Unfortunately, Linstow gave no drawing of the female of 

 his species (fig. 51 of his work represents the caudal end 

 of the male); if he had— the resemblance between the two 

 parasites would have been still moreobvious. 



It is possible that the parasite Oxyuris annulata Linst. 

 1899 is identical to the species described by Dujardiii 

 under the name Oxyuris brevicaudata Duj. 1845 from the 

 intestine of a lizard {Platydactylus fascicidaris). Unfortunately, 

 Dujardindid not supply his description of the female, 6—9 mm. 

 long, and 0,7 mm. wide, with a drawing. 



His definition — „bouche ronde, nue" — may be explained 

 by the imperfect methods of investigation at that time, which 

 prevented Duj ar din from remarking the 6 papilliform lips. 

 The only important fact that speaks against the identity of 

 these species, is the position of the vulva in the species 

 Oxyuris brevicaudata — „au quart anterieur de la longueur", 

 although it may be possible that Duj ardin mistaked the ex- 

 cretory pore for the vulva, the former being also situated in 

 the same part of the body. 



19. Oxyuris obvelata Zeder. 1803. 



This species, which is new for Africa, was found in the 

 intestine of a species of mice (Mammalia M 2) not yet defined. 



IX. Genus Oxysomatium Railliet et Henry. 



The founder of the genus Oxysomatium — A. Schneider 

 made the mistake in 1866 of uniting into this genus the 



