70 BULLETIN 09, UNITED STATES NATIONAL MUSEUM. 



Siabfamily IDIOGrE;]SriI>r^E; FuliriTiann, 1907. 



Suh family diagnosis. — Davaineidse: Suckers (?) unarmed. A sin- 

 gle set of reproductive organs in each segment. Uterus not persistent, 

 sac-like, more or less lobed or much branched. A para-uterine organ 

 develops into which the eggs finally pass. Adults in birds. 



Type-genus. — Idiogenes Krabbe, 1868. 



Genus IDIOGENES Krabbe, 1! 



Generic diagnosis. — Idiogeninse: Genital pores unilateral. Cirrus 

 pouch very large, with retractor. A para-uterine organ develops in 

 front of the uterus into which the eggs finally pass directly from the 

 latter, and which transforms into a single egg capsule. Adults in 

 birds. 



Tyve-species. — Idiogenes otidis Krabbe, 1868. 



Genus CHAPMANIA Monticelli, 1893. 



Capsodavainea Fuhemann, 1901 (type, Capsodavainca tauricollis (Chap- 

 man, 1876) FUHRMANN, 1901). 



Genei'ic diagnosis. — Idiogeninse : Longitudinal musculature greatly 

 developed, consisting of several layers of muscle bundles. Genital 

 pores unilateral. Uterus much branched, disappears, and the eggs 

 become inclosed in numerous o^gg capsules, and finally are pressed 

 into a large anteriorly located para-uterine organ, which transforms 

 into a single Qgg capsule. Adults in birds. • 



Type-species. — Chapmania tauricollis (Chapman, 1876) Monticelli, 

 1893. 



Family HYMENOLEPIDID^ Railliet and Henry, 1909. 



"Hymenolepidce " Ariola, 1899 (type-genus, Hymenolepis). 

 EcMnocotylidce °' Ariola, 1899 (type-genus, Echinocotyle) . 

 ''Dilej)inid(B " Fuhrmann, 1907 (type-genus, Dilepis). 



Family diagnosis. — Tsenioidea : Scolex with an armed rostellum, 

 or without rostellum. Hooks on rostellum not hammer-shaped. 

 Suckers usually unarmed. A single, or rarely, a double, set of repro- 

 ductive organs in each segment. Genital pores marginal and bilat- 

 eral, unilateral, or regularly or irregularly alternate. Egg with thin 

 transparent shells. Adults in mammals, birds, reptiles, and am- 

 phibia. 



Type-genus. — Hymenolepis Weinland, 1858. 



STibfamily I>ir»Y^ll,ir)II]Sr..;E: Stiles, 1896. 



BhyncJiotwnia Diesing, 1850. 

 Malacolepidota Weinland, 1858. 



" Echinocotylidse and Hymenolepidae are both referred to by Ariola ( 1809d, 

 p. 166) on the same page, Hymenolepidse being mentioned first. 



