NEMATODE PARASITES OF BIRDS 293 



KEY TO SPECIES OP YSEIUA 



Female 12 mm. Ionic by 100/* wide; male 8 mm. long. In Alcedo americana 



and Rallus cauennensis Yseria coronata, p. 293. 



Female 25.5 mm. long by 416yu. wide; male unknown. In Oidemia deglandi. 



Yseria californica, p. 293. 



YSERIA CALIFORNICA Gedoelst, 1919 



Host. — Primaiy: Oidemia deglandi; secondary: Unknown. 



Location. — Under mucosa of gizzard. 



Morphology. — Yseria (p. 292) : Color deep brown or almost black; 

 cuticle finely striated transversely. Mouth with 2 lateral hemispher- 

 ical lips surmounted by a triangular tooth; posterior to the lips the 

 head is encircled by a hood with festooned edge. Cervical papillae 

 tricuspid. 



Male unknown. 



Female 25.5 mm. long by 416//, wide. Tricuspid papillae 185/u, from 

 head end. Vulva 14 mm. from head end, thus the ratio of anterior 

 to posterior part of body is 5 : 4. Eggs not described. 



Life history. — Unknown. 



Distribution: — North America (United States (California)). 



YSERIA CORONATA (Molin, 1860) Gedoelst, 1919 



Synonyms. — Spiroptera coronata Molin, 1860; Histioceplialus 

 coronatus (Molin, 1860) Skrjabin, 19166. 



Hosts. — Primary : Alcedo americana and Rallus cayennensis ; sec- 

 ondary: Unknown. 



Location. — Under mucosa of gizzard. 



Morphology. — Yseria (p. 292) : Head set off from body, armed witli 

 crown of sharply pointed, posteriorly directed processes. Mouth 

 with 2 small tooth-like papillae. Body slender, increasing in width 

 post! sriorly, the anterior extremity noticeably attenuated. 



Male 8 mm. long. Caudal extremity conical, its apex truncate. 

 Anus not far from tail end. Vulva in posterior part of body. 



Life history. — Unknown . 



Distribution. — South America (Brazil). 



Genus SERTICEPS Railliet, 1916a 



Generic diagnosis. — Schistorophinae (p. 284) : Head adorned with 

 varied and multiple appendices or festoons. Mouth with 6 small 

 lips each carrying a small papilla. Male with obtuse (ail: caudal 

 alae asymmetrical; 10 pairs of preanal papillae. Two very unequal 

 spicules. Female with obtuse tail. Vulva in region of anus. 



Parasitic between the tunics of gizzard of birds. 



Type-species. — Serticeps vulvoinflata (Molin, 1860) Railliet, 1916a. 



