284 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



region of the most posterior coil; the ascending branches suddenly 

 sharply contracting and having approximately the same width 

 throughout their extent. 



Male unknown. 



Female 13 to 15 mm. long by 700/* wide. Cordons extending pos- 

 teriorly for a distance of 840/*; anastomosis 280/* from head end. 

 Pharynx 425/* long by 30/* wide; muscular esophagus 560/* by 100/*; 

 glandular esophagus 3.57 mm. by 70/*. Vulva 510/* from the tail 

 end, a distance of 340/* anterior to the anus. Tail conical, with 

 rounded end ; anus 170/* from extremity. Eggs 38/* by 20/*, with thick 

 shells. 



Life history. — Unknown ; probably involves intermediate stages in 

 other hosts. 



Distribution. — Africa (French Somaliland (Jibuti)). 



The writer is greatly indebted to Dr. Albert R. Merz, Bureau of 

 Soils, U. S. Department of Agriculture, for the translation of the 

 Russian description of this species. 



Subfamily Schistorophinae Travassos, 1918c 



Subfamily diagnosis. — Acuariidae (p. 210) : Esophagus long, its 

 anterior part differentiated into a pharynx. Mouth with 2, 4, or 

 6 lips and cephalic ornamentation consisting of appendices or 

 festoons. 



Parasitic in digestive tract of birds (between the tunics of the 

 gizzard). 



Type-genus. — Schistorophus Railliet, 1916. 



KEY TO GBNEKA OF SCHISTOROPHINAE 



1. Cephalic ornamentation consisting of 4 sharp cuticular lobes forming a roof 



for the head, projecting at sharp angles from the body. 



Schistorophus, p. 284. 

 Cephalic ornamentation different from above 2. 



2. Mouth with 6 lips ; cephalic ornamentation of multiple appendices of various 



shapes and sizes, some directed anteriorly, some posteriorly ; caudal alae 



asymmetrical; vulva in region of anus Serticeps, p. 293. 



Mouth with 2 or 4 lips ; cephalic ornamentation different from above ; 

 caudal alae symmetrical; vulva not in region of anus 3. 



3. Mouth with 2 lips ; vulva posterior to middle of body ; lateral papillae 



tricuspid Yseria, p. 292. 



Mouth with 4 lips ; vulva in anterior part of body ; lateral papillae not 

 described as tricuspid Histiocephalus, p. 290. 



Genus SCHISTOROPHUS Railliet, 1916a 



Synonyms. — Tetracanthus Hemprich and Ehrenberg in Schneider, 

 1866, not Hope, 1835; Ancyracanthus Schneider, 1866, part, not 

 Diesing, 1838. 



