272 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Morphology. — Streptocara (p. 264) : Mouth with 2 short cone- 

 shaped lips. Linstow states that he could find no cervical frill but 

 that the mouth is surrounded by indefinite radiating chitinous folds. 

 Cervical papillae tricuspid (fig. 335&). 



Male 5.5 mm. long by 13G> wide. Tricuspid papillae 200/x from 

 head end. Anterior part of esophagus 140/a long; total esophagus 

 62G> or 1/9 of total body length ; tail 1/32 of body length. Caudal alae 

 (fig. 335a) fairly wide. Four pairs of preanal, 6 pairs of postanal 

 papillae; of the latter 5 pairs are lateral and 1 pair ventral. Spicules 

 unequal, the left 400//, long, the right 110/i long, the latter with a 

 bulbous swelling at its proximal end. 



Female 16.4 mm. long by 220/a wide. Cervical papillae 16G> from 

 head end. Esophagus 2.4 mm., tail 300/* long. Vulva divides body 



336 



33S^^ 

 339 



Figs. 334-336. — 334, Streptocara triaenucha. Cervical papilla. After 

 Wright, 1897. 335, Streptocara tridentata. a, Male tail. After Linstow, 

 1909. b, Cervical papilla. After Linstow, 1877. 336, Diagram of cordons 

 (as found in Synhimantus) as they would appear if spread out horizon- 

 tally. After Schneider, 1866 



length in ratio of 54:41. Eggs, according to Skrjabin's tabulated 

 description, 36/* long by 18/*, wide. 



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



Distribution. — Europe. 



Genus SYNHIMANTUS Railliet, Henry, and Sisoff, 1912 



Synonyms. — Ascaris Linnaeus, 1758, part ; Strongylus Goeze, 1872, 

 part; Filaria Mueller, 1787, part; Acuaria Bremser, 1811, part; 

 Spiroptera Rudolphi, 1819, part; Dispharagus Dujardin, 1845, part; 

 Histiocephalus Diesing, 1851, part; C heilospirura Diesing, 1861, 

 part. 



Generic diagnosis. — Acuariinae (p. 211) : Cutaneous cordons recur- 

 rent and anastomosing in pairs on each lateral surface (fig. 336). 

 Cervical papillae tricuspid when evident. Males with spicules un- 

 equal and dissimilar; usually 5 pairs of postanal papillae. 



Parasitic in proventriculus or gizzard of birds. 



Type species. — Synhimantus laticeps (Rudolphi, 1819) Railliet, 

 Henry, and Sisoff, 1912. 



key to species of synhimantus 



1. Male 5 mm. long; from Falco tridcntatus— Synhimantus sygmoidea, p. 282. 

 Male (if known) 6 ram. long or longer; from hosts other than above 2. 



