82 BULLETIN 69^ UNITED STATES NATIONAL MUSEUM. 



larly alternate. Genital canals pass between the longitudinal excre- 

 tory vessels and open into a very muscular cloacal canal. Testicles 

 numerous, scattered throughout the entire dorsal medullary portion 

 of the segment. Ovary and yolk gland surrounded by a ring-lik3 

 uterus with secondary branches. Eggs with two shells. Adults in 

 birds. 



Type-species. — Tsenia capita Rudolphi, 1819. 



* CYCLUSTERA CAPITO « (Rudolphi, 1819) Fuhrmann, 1901. 



For description see Krabbe, 1869b, pp. 281-282, pi. 4, figs. 94, 95 {Txnia 

 capita). 



Host. — *Ajaia ajaja. 



Genus LATEROT^ENIA Fuhrmann, 1906. 



Generic diagnosis. — Dipylidiinae : Rostellum simple, armed with a. 

 double crown of hooks. Genital pores irregularly alternate. Geni- 

 tal canals pass dorsal of the ventral excretory vessel, and ventral of 

 the dorsal excretory vessel and longitudinal nerve. Testicles numer- 

 ous, in lateral portions of segment in the region of the longitudinal 

 excretory vessels. Female glands toward the pore side of the seg- 

 ment in the lateral portion of the medullary parenchyma. Uterus 

 sac-like. Eggs with two envelopes. Adults in birds. 



Type-species. — Laterotsenia natteri Fuhrmann, 1906 = Laterotsenia 

 nattereri Fuhrmann, 1908 (orthographic emendation). 



Genus PROORCHIDAb Fuhrmann, 1907. 



Generic diagnosis. — Dipylidiinae: Scolex armed with a double 

 crown of hooks. Genital pores unilateral. Testicles in front of the 

 female glands. Uterus much lobulated (?). Adults in birds. 



Type-species. — ProorcMda lohata Fuhrmann, 1908. 



Genus CYCLORCHIDA Fuhrmann, 1907. 



Generic diagnosis. — Dipylidiinae: Rostellum armed with a double 

 crown of hooks, which have a very large dorsal root and small hook 

 portion. Genital pores unilateral. Genital canals pass between 

 the longitudinal excretory vessels. Cirrus pouch communicating 

 with the genital cloaca by a narrow canal opening upon a large 



a This species, originally described by Rudolphi on the basis of specimens collected 

 in Brazil, has been found in the same host, Ajaia ajaja (Bureau of Animal Industry, 

 Helminthological Collection No. 4164), in this country, at the National Zoological 

 Park, Washington, D. C, where the bird had been brought from Texas. Fuhrmann 

 (1908a, p. 138), probably through error, lists C. capito in Platalea leucerodia, but not 

 in Ajaia ajaja. 



b This genus was first mentioned by Fuhrmann in 1907 (1907a, p." 292), but was not 

 described nor was the type designated until 1908 (1908b, p. 59). 



