64 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Female 7.6 mm. long by 460/* wide. Esophagus % of body length. 

 Tail length y 8 of body length. Vulva almost in equator of body. 

 Eggs 57/t long by 42[x wide. 



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



Distribution. — Europe (Germany) . 



HETERAKIS INTERLABIATA Ortlcpp, 1923 



Host. — Rhizothera longirostris. 



Location. — Ceca. 



Morphology. — Heterakis (p. 50) : Mouth with 3 lips which are cut 

 in at their base; between each pair of lips a small interlabium. 

 Dorsal lip with 2 papillae, the other lips with one papilla each. 

 Lateral alae well developed, conspicuous, commencing a little pos- 

 terior to the head (fig. 85), extending into posterior half of body. 



Male 7 mm. long by 30(V wide. Bursa continuous anteriorly across 

 ventral surface. Tail with long filiform appendage. Twelve pairs 

 of caudal papillae of which 3 are preanal, 5 adanal, and 4 postanal. 

 Spicules equal, 1.25 mm. long, or slightly subequal, the left flanged, 

 the right tapering to an acute tip (fig. 86). 



Female 8 to 9.5 mm. long by 360 to 400[a wide. Tail long and 

 pointed. Vulva at about middle of body. Eggs oval, 66//, long by 

 37[x wide. 



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



Distribution. — Asia (Straits Settlement (Malacca)). 



HETERAKIS ISOLONCHE Linstow, 1906 



Synonym. — Probably Heterakis neoplastica Wassink, 1917 (p. 65). 



Hosts. — Crossoptilon manchurianum, Lophophorus impeyanus, 

 Ithagenes cruentus, Phasianus colchicus, P. chrysomelas, Thaumalea 

 amherstiae, T. picta, Tragopan satyra. 



Location. — Ceca. 



Morphology. — Heterakis (p. 50) : Mouth with 3 small lips, each 

 with 2 papillae. Esophagus region of body with narrow lateral 

 membranes. Esophagus with bulb. 



Male 7.5 to 9 mm. long by 380 to 480^ wide. Esophagus 1/6.8 

 total length. Tail 1/13 of total length, ending in a long slender point 

 (fig. 87). Caudal alae continuous anteriorly across ventral surface 

 in specimens examined by the writer, though this is not shown in the 

 figures. Preanal sucker 130 to 150/x in diameter, with chitinous ring. 

 Twelve pairs of caudal papillae, according to Linstow, 11 pairs 

 according to Lucet and Henry; 2 pairs are in conjunction with the 

 sucker, 5 or 6 pairs are adanal, and 4 pairs postanal. Spicules equal 

 (1.41 mm.), according to Linstow; according to Lucet and Henry 

 subequal, 1.4 to 1.75 mm. long. They have, wide alae. 



