NEMATODE PARASITES OF BIRDS 75 



Distribution. — South America (Brazil). 



Railliet and Henry do not list this species in the Heterakidae and 

 Stossich and Travassos say it is a doubtful species; the evidence 

 seems adequate, however, for its place in the Heterakinae and the 

 present writer is leaving it in this genus. 



HETERAKIS BONASAE, new species 



Host. — Bonasa umbellus. 



Location. — Ceca. 



Morphology,. — Hete?*akis (p. 50) : Head with 3 lips. Buccal cav- 

 ity present. Esophagus with bulb at posterior end. Lateral alae 

 present, very narrow (16.6/*), extending from a point about 133/* 

 posterior to the cephalic end, to the anal region of the female and 

 to the region of the anterior end of caudal alae of male. 



Male 7 nun. long by 365/* maximum width. Buccal cavity 41.5/* 

 deep: esophagus, including bulb, 1.0 mm. long; bulb 216/* in diameter. 

 Tail (fig. 104) ending in a slender appendage 158/* long; bursal alae 

 wide. Cloacal aperture 415/* from posterior end. Preanal sucker 

 prominent; its posterior rim 116/* anterior to cloacal aperture and 

 interrupted by a papilla in the median line; internal diameter of 

 sinker 83/*, external diameter 100 to 120/*. Thirteen pairs of caudal 

 papillae, of which 5 are preanal, 1 adanal. and 7 postanal. Spicules 

 unequal, the longer 1.4 to 1.6 mm., the shorter 1.1 to 1.3 mm. long; 

 both alate. 37/* wide. 



Female 7 to 8 mm. long by 365 to 398/* wide. Buccal cavity 50/i 

 deep; esophagus, including bulb, 1.1 mm. long; diameter of bulb 

 249/*. Anus 830 to 860/* from posterior end. Tail slender, sharply 

 pointed. Vulva (fig. 105) directly at middle of body or slightly 

 posterior to middle (dividing body length in ratio of 10:9). the 

 vulvar lips being slightly salient, in some cases the under lip 

 markedly so. Eggs 75 to 83/* long by 42/* wide. 



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



Distribitfio'n.— North America (United States (Pennsylvania)). 



Type material.— Nbi 2637$, l.S.X.M. (Bureau of Ajiimal Industry 

 Ilclniinthological Collections ) . 



I am indebted for this material from the ruffed grouse to Dr. E. L. 

 Brunett, Cornell [Jniversity. 



HETERAKIS NATTERERI Travassos, 1923 



Etost. ' '/>>■'■ hhuiicnhiicii'i. 



Location. — Ceca. 



Morphology. — Heterakis (p. 50): Head with X lips, vestibule 2 

 to 28/* deep: total length of esophagus 600/*; pyriform bulb L70/* in 



diameter, with heavilv chitinized valves. 



