HETERAKINAE 13 



posterior bulb. Male without caudal alae. Spicules subequal. 

 An accessory piece present. 



Hab. Colon and caecum of Rodents. 



Genotype : P. [^Ascaris] uiicinata (Rudolphi, 1819). 



Rudolphi, 1819, Entozoorum Synopsis, 661 ; Travassos, 

 1914, Mem. Inst. Osiv. Cruz, Rio de Janeiro, vi, 137 ; Hall, 

 1916, Proc. U.S. Nat. Mus., 1, 44, 49. 



6. Strongyluris Muller, 1894. 



Lateral fields conspicuous, composed of a single row of 

 large cells. Lips well developed, without " cordons," but 

 expanded in front and at the sides into a cuticular flange. 

 Oesophagus with relatively long pharjmx, the lumen of which 

 forms a ventral " kink " at its posterior end, and with a well- 

 developed posterior bulb. Tail of male obliquely truncate 

 ventrally, and with a short terminal spike. Well-developed 

 alae supported by stout pedunculate papillae, giving the 

 appearance of a bursa. Spicules relatively long, equal. No 

 accessory piece. Uterine branches parallel. Segmentation 

 may begin before oviposition. 



Hab. Alimentary canal of Lizards and Chameleons. 

 Genotype : S. brevicaudata Muller, 1894. 



Muller, 1894, Arch.f. Naturg., Ix, 113, 116. 



7. Spinicauda Travassos, 1920. 



Syn. Sonsinia Baylis & Daubney, 1922. 



Lateral fields conspicuous, composed of single row of large 

 cells. Lips subtriangular, expanded anteriorly and laterally 

 as in Strongyluris, without "cordons." Oesophagus with a 

 short pharynx and a posterior bulb. Tail of male long, straight 

 and tapering, without alae. Papillae small and sessile. 

 Spicules short, subequal. An accessory piece present. 

 Uterine branches parallel. 



Hab. Alimentary canal of Lizards and Chameleons. 

 Genotype : S. [Ascarisl spinicauda (Olfers, in Rudolphi, 

 1819). 



Olfers, in Rudolphi, 1819, Entozoorum Synopsis, 40, 272 ; 

 Travassos, 1920 (?), Eev. Vet. e Zootech., Rio de Janeiro, 64; 

 1920, Mem. Inst. Osiv. Cruz, Rio de Janeiro, xii, 44 ; Baylis 

 & Daubney, 1922, Mem. hid. Mus., vii, 297 ; Baylis, 1923, 

 ParasitoL, xv, 12. 



Spinicauda icosiensis Seurat, 1917, appears to occupy a 

 position intermediate between this genus and Strongyluris, 

 because the tail of the male is obliquely truncate ventrally 

 but has an elongate terminal cone. 



