44 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



long which gradually diminishes in width to the vulva. Vulva (fig. 

 53) a large prominent opening with salient lips slightly posterior 

 to the middle of the body. 



Life history. — Unknown; probably similar to that of Syngamus 

 trachea (p. 36). 



Distribution. — Europe (Belgium and Sicily). 



CYATHOSTOMA VARIEGATUM (Creplin, 1849) Chapin, 1925 



Synonyms. — Strongylus trachealis Nathusius, 1837; Strongylus 

 variegatus Creplin, 1849; Syngamus variegatus (Creplin, 1849) 

 Railliet, 1898. 



Hosts. — Ciconia nigra, G. alba ( ? ) , and Grus viridirostris. 



Location. — Trachea. 



Morphology. — Cyathostoma (p. 41) : Mouth aperture (fig. 55) 

 circular ; buccal capsule with 6 teeth ; 6 circumoral papillae. Buccal 

 capsule 260/* long by 140/* wide. 



Figs. 54-55. — Cyathostoma variegatum. 54, Male bursa. 55, Head, a, Front 

 view ; b, side view. From Chapin, 1925, after Linstow, 1890 



Male 7.8 to 9.5 mm. long by 350//, wide. Body slightly attenuated 

 anteriorly and posteriorly; terminating posteriorly in a truncate 

 tail. Esophagus 730/* long. Dorsal ray (fig. 54) bifurcated. Spic- 

 ules similar and equal, 690/* long and filiform. 



Female 13.5 to 21.5 mm. long by 550/* wide. Esophagus 1.075 

 mm. long. Anus just anterior to tip of tail; tail acute. Vulva one- 

 third of body length from anterior end, or 7.6 mm. Eggs 80/* by 

 40/* (Chapin) or 92/* by 53/* (Skrjabin). 



Life history. — Unknown; probably similar to that for Syngamus 

 trachea (p. 36). 



Distribution. — Europe and Eastern Asia. 



CYATHOSTOMA BOULARTI (Megnin, 1884) Chapin, 1925 



Synonyms. — Sclerostoma boularti Megnin, 1884; Syngamus bou- 

 larti (Megnin, 1884) Railliet, 1898. 

 Host. — Casuarius galeatus. 

 Location.— Trachea. 



