88 BULLETIlSr G9, UNITED STATES NATIONAL MUSEUM. 



* METROLIASTHES LUCIDA Ransom, 1900. 



For description see Ransom, 1900a, pp. 213-226, pi. 13, 14; 1905b, pp. 273-274, 

 figs. 2, 9, 21, 27. 



Hosts. — * Meleagris gallojjavo domestica, *GaTlus gallus domesticus? "■ 



Genus BIUTERINA Fuhrmann, 1902. 



Generic diagnosis. — Pariiterininse : Rostellum armed with a double 

 crown of hooks triangular in shape, i. e., with short dorsal and ven- 

 tral roots. Genital pores irregularly alternate. Genital canals pass 

 between the longitudinal excretory vessels. Uterus single in origin 

 becomes more or less completely divided into two parts in front of 

 which a para-uterine organ develops. The latter is transformed into 

 an egg capsule after the passage of the eggs into it from the uteri. 

 Eggs with two envelopes. Adults in birds. 



Type-species. — Biuterina paradisea Fuhrmann, 1902 = Biuterina 

 clavulus'' (Linstow, 1888). 



BIUTERINA LONGICEPS (Rudolphi, 1819) Fuhrmann, 1908. 



For description see Krabbe, 1869b, pp. 337-338, pi. 10, figs. 277, 278 {Txnia 

 longiceps). — Fuhrmann, 1908d, pp. 424-425, figs. 22, 23. 



Host. — fCairina moschata. 



BIUTERINA PASSERINA Fuhrmann, 1908. 



For description see Clerc, 1906b, pp. 721-722, figs. 19, 20 (Biuterina meropina). — 

 Fuhrmann, 1908d, pp, 426-i28, figs. 28-31. 



Host. — Alauda arvensis. 



BIUTERINA TRAPEZOIDES Fuhrmann, 1908. 



For description see Fuhrmann, 1908d, pp. 420-421, figs. 12-14. 

 Host. — Molothrus ater. 



Genus NEMATOT^^NIA Liihe, 1899. 



Generic diagnosis. — Paruterininse : Scolex unarmed, without ros- 

 tellum. Segmentation of strobila distinct only at the posterior end. 

 Strobila circular in cross section. Genital pores alternate. Genital 

 canals pass dorsal of the longitudinal excretory vessels and nerve. 

 Uterus horseshoe-shaped, disappears early. Eggs through the action 

 of numerous para-uterine organs become inclosed in egg capsules, 

 3 or 4 in each capsule. Adults in amphibia. 



Type-species. — Txnia dispar Goeze, 1782. 



«A specimen in the collection of the Bureau of Animal Industry is recorded as 

 collected from a chicken, but it is very probable that a mistake in labeling has been 

 made in this case. 



b Fuhrmann (1908a, p. 68; 1908d, p. 414) has found that Biuterina paradisea is iden- 

 tical with Tsenia davulus Linstow, 1888. Hence, the correct name of this species is 

 Biuterina davulus. 



