NEMATODE PARASITES OF BIRDS 



89 



Morphology. — Ascaridia (p. 77) : Mouth with 3 semicircular lips, 

 the dorsal lip with 2, the other lips with 1 papilla. 



Male 27 mm. long by 880/x wide. Esophagus 1/12, tail 1/70 of 

 total length. Caudal extremity heart-shaped (fig. 121). Preanal 

 sucker circular. Eight pairs of caudal papillae, 3 of which are pre- 

 anal and 5 postanal. Spicules subequal, the right 2.06 mm., the 

 left 2.37 mm. long. 



Female 42 mm. long by 1.11 mm. wide. Esophagus 1/16, tail 1/35 

 of total length. Vulva slightly anterior to middle of body, dividing 

 the body length in ratio of 16 : 17. Eggs 91/x long by 57ju wide. 



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



Distribution. — North America (Mexico). 



Figs. 121-122. — 121, Ascaridia cordata. Male tail. After Linstow, 1908. 122, 

 Ascaeujia cristata. a, Head; b, male tail. After Linstow, 1901 



ASCARIDIA CRISTATA (Linstow, 1901) Railliet and Henry. 1914 



Synonym. — Heterakis cristata Linstow, 1901. 



Hosts. — Belearica pavoniria, B. regulosum, Grus antigone. 



Location. — Intestine. 



Morphology. — Ascaridia (p. 77) : Mouth with 3 lips, the ventro- 

 laterals larger and bearing 2 blunt teeth; dorsal lip with 2 papillae. 

 Lateral alae strongly developed, extending about 1.22 mm. posterior 

 from the head. Esophagus 1/9 of body length. According to 

 Baylis and Daubney (1922) there are 27 pairs of cervical papillae, 

 similar to those in A. columbae, extending from a point about 900/i, 

 from the head posteriorly for a distance of 6 to 6.5 mm., on the dorsal 

 surface. 



Male 35 to 38 mm. long by 1.1 to 1.34 mm. wide. Tail 1/72 of 

 total length; it does not become narrower until very near the pos- 

 terior extremity. Preanal sucker longer than wide. According 



