ADDEISTDTTM. 



Seiirat (1916: Compt. rend. Soc. do bioL, Par., v. 79 (2), pp. 64-68, 

 figs. 1-3) has recently divided Oxyuris as follows: Oxyuris Rudolplii, 

 typo 0. equi (vSchraiik) ; Passalurus Dujardin, type P. amhiguus 

 (Rudolplii); Sypliacia Seiirat, type S. ohvelata (Rudolplii); and 

 Fusarella Seurat, typo F\ vermicularis (Linnssus). Railliot and 

 Henry (1916: Ibidem, v. 79 (3), pp. 113-115) follow him with a 

 paper dividing the Oxyuridae into five groups as follows: (1) Those 

 forms with a single spicule, no gubornaculum, and the vulva anterior 

 to posterior in location; (2) tliose with one spicule and a gubernacu- 

 um, vulva anterior or posterior; (3) those with two equal spicules, 

 no gubernaculum, and vulva in the middle or posterior; (4) those 

 with two equal spicules and a gubernaculum, and the vulva in the 

 middle or rarely anterior; (5) those with two unequal spicules and a 

 gubernaculum, and with the vulva near the anus. The species 

 included in the present paper would fall for the most part in the 

 genus Sypliacia, which is in the second group; 0. triradiata appar- 

 ently remains in the restricted genus Oxyuris, in the first group ; and 

 some may fall in Enterolius (of which Fusarella and Oxyurias are syn- 

 onyms) in the first group. The genus Welcomea Samboii, 1907, 

 founded on the eversion of the vagina, may need to be considered 

 with a view to differentiating its species from those of Sypliacia. 



Seurat (1916: Ibidem, v. 79 (3), pp. 143-146, figs. 1-5) notes that 

 Protospirura numidica Seurat, 1915, originally described from Felis 

 ocreata, is a pseudo-parasite in that host and a normal parasite of 

 Arvicanthis harharus. P. numidica is smaller than P. ascaroidea, 

 since the female attains a maximum length of not over 35 mm.; the 

 lobes of the lips have fewer denticles (2 to 4) than P. muns; and the 

 eggs are much larger (52 /^ long) than those of P. labiodentata. Re- 

 ported from Algeria. 



Seurat (1916: Ibidem, v. 79 (3), pp. 146-149, figs. 1-2) has noted 

 that Rictularia proni Seurat, 1915, described from Ilerpestes ichneumon 

 is likewise a pseudo-parasite with Arvicanthis harharus as its normal 

 host. This species is larger than R. coloradensis, since the female 

 attains a maximum length of 39.7 mm., and can be differentiated 

 from the othei" species of Rictularia from rodents by the fact that 

 the vulva is in the region of the thirty-fourth pair of combs. Re- 

 ported from Algeria. 



10600°— Proc.N.M.vol.50— 16 15 225 



