330 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Life history. — Unknown; probably involves intermediate stages in 

 other hosts. 



Distribution. — Asia (Siam). 



OXYSPIRURA SYGMOIDEA (Molin, 1860) Stossich, 1897 



Synonyms. — Spiroptera anthuris Rudolphi, 1819, of Diesing, 1851, 

 part; Spiroptera sygmoidea Molin, 18605; Filaria anthuris Linstow, 

 1878, not Filaria anthuris (Rudolphi, 1819) Schneider, 1866. 



Hosts. — Primary: Corvus corone, C. frugilegus,' secondary: Un- 

 known. 



Location. — Orbital cavity and under nictitating membrane. 



Morphology. — Oxyspirura (p. 321) : Body sigmoidal, attenuated 

 at both ends, truncated anteriorly, slender and acutely pointed pos- 

 teriorly. Cuticula with fine transverse striations. Mouth large, or- 

 bicular, without lips; 4 submedian cephalic papillae. 



Pig. 394. — Oxyspirura parvovuji. Posterior end of female. After Sweet, 1910 



Male 11 mm. long by 40G> wide. Tail coiled in 2 turns, without 

 alae. Four pairs of postanal papillae (fig. 396), the papillae of the 

 third pair from posterior end lateral of the others; preanal papillae 

 apparently absent. Spicules unequal, the right short, thick, some- 

 what curved, with very blunt point ; the left filiform, pointed, alate, 

 and 2^2 times as long as the right. 



Female 11 to 15 mm. long bj 7 500/* wide. Anus some distance from 

 tail end. Position of vulva not determined. 



Life history. — Unknown ; probably involves intermediate stages in 

 other hosts. 



Distribution. — Europe (Austria (Vienna) ) and Asia (Russian 

 Turkestan). 



OXYSPIRURA TANASIJTCHUKI Skrjabin, 1916 



Hosts. — Primary: Birds of the family Icteridae; secondary: 

 Unknown. 



Location. — Conjunctival sac. 



Morphology. — Oxyspwura (p. 321) : Body white. Cuticula with 

 extremely delicate transverse striations. Anterior extremity (fig. 

 397a) rounded. Buccal cavity 170^ long, with thick walls. Two 

 lateral and 4 submedian papillae. 



