102 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



ASCARIDIA ANSERIS Schwartz, 1925 



Host. — A riser domesticus. 



Location.— -Small intestine. 



Morphology. — Ascaridia (p. 77). 



Male 32 mm. long by GOO/* wide. Head, separated from body, 172/* 

 wide near base. Esophagus 1.75 mm. long by 285/* in maximum 

 width. Nerve ring about 350/* from head end. Preanal sucker 

 circular, 138/* by 130/*, its posterior margin 172/* from cloacal aper- 

 ture and at least 700/* from posterior end of body (tip of tail 

 broken off in specimen described so that complete measurement not 

 possible). Caudal papillae asymmetrical, there being 14 papillae on 

 one side and 13 papillae on the other side. Of the 14 papillae, 5 are 

 preanal (4 ventral and 1 lateral) and 9 postanal (4 ventral and 5 

 lateral). Of the 13 on the other side of the body, 4 are preanal and 

 ventral and 9 are postanal but of different arrangement (there being 

 5 ventral and 4 lateral) than the postanal papillae of the opposite 

 side. Spicules nearly equal, 820/* and 827/* long, respectively, their 

 distal ends rounded (fig. 144). 



Female unknown. 



Life history. — Probably similar to that of A. galli (p. 82). 



Distribution. — Asia (Hanoi (Tonkin) Indo-China). 



Genus PSEUDASPIDODERA Baylis and Daubney, 1922 



Generic diagnosis. — Heterakinae (p. 49) : Mouth with 3 lips and 

 with " cordons " resembling those of Aspidodera, opening in pairs 

 at the interlabial spaces and consisting of tubular grooves running 

 below the surface of the cuticle, with a narrow external opening 

 along their length. Members of each pair of cordons diverge, ex- 

 tending posteriorly a short distance then curve forward and end on 

 outer surface of lip, not joining the corresponding member of the 

 next pair as in Aspidodera. Narrow lateral alae present. Esopha- 

 gus muscular throughout, ending in a well-developed bulb. 



Male with caudal alae and long pedunculated papillae ; spicules 

 very dissimilar; gubernaculum absent. 



Female with vulva in median region of body. 



Parasitic in alimentary canal, presumably ceca, of birds. 



Type-species. — Pseud asp id odera pavonis Baylis and Daubney, 

 1922. 



A second species and also a variety of it have been described 

 recently by Chandler. (See Addenda, p. 387.) 



