NEMATODE PARASITES OF BIRDS 271 



Morphology. — Streptocara (p. 2G4) : Head with 2 large lips and 

 with a dilation in manner of a hood with denticulate margin. A 

 tricuspid process a little posterior to this dilation. 



Male unknown. 



Female 16 mm. long. Anus at caudal extremity, the latter obtuse. 

 Vulva at about middle of body. Eggs oval, containing an embryo 

 when oviposited. 



Life history. — Unknown ; see S. pectinifera, p. 266. 



D istribution. — Arctic region . 



There are no figures of this species and the description is scant. 

 It appears questionable as to whether the species belongs in Strepto- 

 cara as placed by Skrjabin, or in Yseria as placed by Gedoelst. The 

 latter author had apparently not seen Skrjabin's assignment; it is 

 therefore being left for the present in Streptocara by the present 

 writer. 



STREPTOCARA TRIAENUCHA (Wright. 1879) Skrjabin. 1916 b 



Synonyms. — Filaria triaenucha Wright, 1879; Acuaria triaenucha 

 (Wright, 1879) Ward, 1918. 



Host. — Primary : Botaurus minor; secondary : Unknown ; see S. 

 pectinifera, p. 266. 



Location. — Proventriculus. 



Morphology. — Streptocara (p. 264) : Cuticle densely striated. A 

 cervical frill present, the tops of the lateral loops being 180/x from 

 anterior end; it extends posteriorly on the neck for a distance of 

 405/*. Cervical papillae (fig. 331) tricuspid, the root being 60/* 

 posterior to the end of the frill ; the papilla itself measures 6G> from 

 the root to the end of the median fork. 



Male unknown. 



Female 10 mm. long by 430/* wide. Tail ending in a short rounded 

 conical projection. Eggs 27/* long by 18/* wide. 



Life history. — Unknown. 



Distribution. — North America (Canada). 



The description of the cervical frill and especially its extent does 

 not seem to correspond with the species of the genus Streptocara. 

 It is possible that this species belongs in Yseria, where the cervical 

 hood or frill is larger and the cervical papillae tridentate. However, 

 as there are no figures of the head of this species, and as the de- 

 scription is incomplete, the transfer to another genus is inadvisable. 



STREPTOCARA TRIDENTATA (Linstow, 1877) Skrjabin, 191Gb 



Synonyms. — Filaria tridentata Linstow, 1877 a and 1>; Spiroptera 

 tridentata (Linstow, 1877) Neumann, 1900. 



Hosts. — Primary: Colymbus arcticus, Larus ridibundus; second- 

 ary: Unknown; see S. pectinifera, p. 266. 



Location. — Esophagus and intestine. 

 3G12— 27 19 



