70 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Morphology. — Heterahis (p. 50) : Mouth with 3 small equal lips. 

 Esophagus 1.13 to 1.2G mm. long, with small bulb. 



Male 10 mm. long. Cloacal aperture (fig. 94) 352^ from posterior 

 end. Preanal sucker circular, about 90/x in diameter, with a papilli- 

 form nodule in its posterior rim. Ten pairs of caudal papillae, 

 asymmetrically disposed, 3 of them preanal, 7 postanal. Spicules 

 short, robust, and equal, measuring about 630/a long. 



Female 12 mm. long. Anus 800 to 900/x from posterior end. Vulva 

 (fig. 95) a little posterior to middle of body. Posterior to the vulva, 

 papilliform cuticular swellings varying in number from 1 to 6 

 (usually 4) ; at times they are greatly reduced in size. Eggs 52/x, 

 long by 39ju, wide. 



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



Distribution. — South America (Brazil). 



Figs. 94-95. — Heterakis psophiae. 94, Male tail. 



assos, 1913 



95, Vulva. After Trav- 



HETERAKIS PUSILLA Linstow, 1906 



Hosts. — Gallus gallus and Gallus lafayettU. This species is listed 

 from the chicken by Gedoelst. Linstow described it from G. lafay- 

 ettii and there appears to be no definite record from the chicken. 



Location, — Ceca. 



Morphology. — Heterakis (p. 50) : Head with small rounded lips. 



Male 5 mm. long by 190/a wide. Esophagus 1/5 of body length. 

 Tail (fig. 96) comprises 1/12 of body length and is finely pointed. 

 Left spicule 530/* long; right spicule 150^, long. Caudal sucker 

 round. Four pairs large postanal papillae, the interval in the case 

 of the 2 posterior pairs greater than the intervals for other adjacent 

 pairs. 



Female 5.13 mm. long by 240/* wide. Esophagus length equal to 

 5/29 of body length. Tail length equal to 2/19 of bod}^ length ; long 

 and pointed. Vulva 12/17 of body length behind head end. Eggs 

 thick-shelled, 65/u. long by 3Lu wide. 



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



Distribution. — Northern Province (Mamadu). This locality could 

 not be definitely located but is thought to be in the Uganda Protec- 

 torate, British East Africa. 



