NEMATODE PARASITES OF BIRDS QQ 



HETERAKIS ALATA Schneider, 1866 



Hosts. — Orypturus, species and Tinamus, species. 



Location. — Intestine. 



Morphology. — Heterakis (p. 50): Mouth with 3 small lips. Lat- 

 eral membranes large. Travassos says esophagus with bulb more or 

 less developed, with a diameter of about 240 to 300/*; the slender part 

 measures about 1.2 mm. long. 



Male 17 to 20 mm. long. Caudal alae (fig. 68) wide; preanal 

 sucker about ISO//, in diameter, with a papilla on its posterior border. 

 Schneider described and figured only 9 pairs of caudal papillae but 

 Travassos states there are 14; his figure seems to show 13 pairs. 

 Spicules slender, about 030 to 650/x, long. Cloacal aperture about 

 279// from posterior end. 



Female 25 mm. long, according to Schneider; 35 to 37 mm. long, 

 according to Travassos. Vulva at anterior third of body. Anus 

 about 460,u from posterior end. Eggs 59// long by 37// wide. 



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



Distribution. — South America (Brazil). 



HETERAKIS ARQUATA Schneider. 1866 



Synonym. — Ascaridia arquata (Schneider, 1866) Railliet and 

 Henry, 1914. The allocation by these authors of this species to 

 Ascairidia evidently was based on Schneider's inadequate descrip- 

 tion: Travassos has shown, in a more complete study, that it belongs 

 in the genus Heterakis. 



Hosts. — Grypturus cupreus and Psophia viridis. 



Location. — Intestine. 



Morphology. — Heterakis (p. 50) : Mouth with 3 very small lips 

 with no teeth. Lateral membranes present. Travassos says esopha- 

 gus 1.35 to 1.44 mm. long, with a small bulb and a slight dilation in 

 the anterior parr. 



Male 14 to 22 mm. long. Preanal sucker 90// in diameter, a papilla 

 on its posterior border. In addition (fig. 69) 12 pairs of caudal 

 papillae, •"'> of them preanal. Spicules equal and similar: Travassos 

 says they are about 260// long, but he must mean 2.6 mm., judging 

 from his figure (fig. 70), since he says the cloacal aperture is 270// 

 from the posterior end. 



Female 22 to 31 nun. long. Vulva salient, situated a little an- 

 terior to the middle of the body. Anus about 1.12 mm. from pos- 

 terior end. Eggs 52/* long by 2!)// wide. 



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



Distribution. — South America (Brazil). 

 3612—27 6 



