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BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



SYNHIMANTUS LATICEPS (Rudolphi, 1819) Stiles and Hassall, 1920 



Synonyms. — Spiroptera laticeps Rudolphi, 1819; Dispharagus lati- 

 ceps (Rudolphi, 1819) Dujardin, 1845; Filaria laticeps (Rudolphi, 

 1819) Schneider, 1866; Spiroptera fallax Siebold, 1837; Filaria in- 

 voluta Linstow, 1879; Dispharagus spiralis Linstow, 1883, not D. 

 spiralis Molin, 1858; Dispharagus involutus (Linstow, 1879) Stos- 

 sich, 1891; Acuaria laticeps (Rudolphi, 1819) Railliet, Henry, and 

 Sisoff, 1912; Acuaria {Synhimantus) laticeps (Rudolphi, 1819) 

 Railliet, Henry, and Sisoff, 1912. 



Hosts. — Primary : Falco lagopus, Strix bubo, S. alba, S. brachyo- 

 tus, Falco nisus, F. tinnunculus, Gallus domesticus, Falco cyaneus, 



338 



339. 



Figs. 338-341. — 338, Synhimantus brevicaudata. a, Head end; b, 

 female tail. after skrjabin, 1917. 339, synhimantus denticu- 

 lata. Head end. After Dujardin, 1845. 340, Synhimantus lati- 

 ceps. Male tail. After Seurat, 1916. 341, Synhimantus lati- 

 ceps. Head. After Schneider, 1S66 



Strix flammea, Bubo maximus, Buteo lagopus, Circus cineraceus, G. 

 cyaneus, Otus braohyotus, Cerchneis tinnunculus, Otus vulgaris, Ac- 

 cipiter nisus, Aegiolus otus; secondary : Unknown. 



Location. — Esophagus and proventriculus. 



Morphology. — Synhimantus (p. 272) : Cutaneous cordons (fig. 3-11) 

 recurrent for one-half their length or more, anastomosing in pairs on 

 each lateral surface; a little behind their termination there is a tri- 

 dentate cervical papilla on each side. 



Male 7.2 to 10 mm. long by 180/x wide or wider. Body enrolled on 

 itself. Caudal alae (fig. 340) 1.5 mm. long or longer, with thick 

 vesicular borders. Spicules unequal and dissimilar, the right 170/* 

 long by 18/x wide, the left 590/* long, slender, its free portion alate 

 and its tip slightly dilated and divided into 2 lateral lobes. Six to 



