NEMATODE PARASITES OF BIRDS 63 



HETERAKIS FARIAI Travassos, 1913 



Host. — Odontophoi us capueira. 



Location . — Intestine. 



Morphology. — Heterakis (p. 50) : Mouth with 3 equal lips. Esoph- 

 agus about DOCV long, provided with a bulb. 



Male 6 mm. long. Caudal extremity with a long tapering pro- 

 longation (fig. 83). Caudal alae wide. Preanal sucker circular, 

 about 3(>pi in diameter, with a papilla on its posterior rim. Twelve 

 pairs of papillae, some of them asymmetrically arranged; 3 pairs 

 are preanal. Spicules long and unequal. Travassos describes them 

 as 810/x and 17<V long but his figure does not show any such great 

 difference in the size. Judging from the position of the cloacal 

 aperture which he says is 488^ from the posterior end, the shorter 

 spicule would measure about 900/x and the longer spicule over 1 

 mm. (roughly 1.3 mm.) in length. 



Fig. 83. — Hetkuakis faisiai. Mali: tail. After Travassos, 1913 



Female 7 mm. long. Vulva near middle of body. Anus about 1 

 mm. from the posterior end. Eggs 74/* long by 33/a wide. 

 Life history. — Probably similar to that of H. gallinae (p. 54). 

 Distribution. — South America (Brazil). 



HETERAKIS HAMULUS Linstow, 1906 



Hosts. — Pa/oo cristatus and P. spicifer. 



Location. — Cecum. 



Morphology. — Heterakis (p. 50) : Head with 3 slightly prominent 

 lips. Short esophagus terminating in a bulb. Tail pointed. Cuti- 

 cle finely striated transversely. 



Male 7.5 mm. long by 410/x wide. Esophagus length 1/9 of body 

 length. Right spicule (fig. 84) slender, 370/* long, ending in a hook 

 distally; left spicule straight, 320/u, long, surrounded by a broad cor- 

 neous sheath from which only the point projects. Sucker 71/a in 

 diameter. Two stalked papillae on each side of the sucker. 5 papil- 

 lae on each side of the cloacal aperture, the posterior pair being more 

 ventrally located than the others, and 3 pairs of papillae posterior 

 to these. Tail length is 1/21 of total length. 



