T^.NIOTD CESTODES OF NORTH AMERICAN BIRDS. 73 



Genus TRICHOCEPHALOIDKS Sinitsin, 1896. 



Generic diagnosis. — Dipylidiinae : Rostellum with single crown of 

 hooks. Genital pores unilateral, subdorsal. Testicles few, but more 

 than four, in posterior region of segment. Uterus sac-like; eggs few. 

 Adults in birds. 



Type-species. — TricJiocepJialoides inermis Sinitsin, 1896 (= Tsenia 

 megalocepJiala Krabbe, 1869; see Fuhrmann, 1901a, p. 761, and 

 Clerc, 1902a, p. 662). 



TRICHOCEPHALOIDES MEGALOCEPHALA (Krabbe, 1869) Clerc, 1902. 



For description see Krabbe, 1869b, pp. 283-284, pi. 5, figs. 100-103 (Tsenia mega- 

 locephala).— Clerc, 1902a, pp. 662-663, fig. 5; 1903, pp. 350-353, pi. 9, fig. 

 33; pi. 10, fig. 57. 



Hosts. — Totanus totanus, Calidris leucopJisea, Pisohia damacensis, 

 Erolia ferruginea, Pelidna alpina, Arquatella maritima. 



Genus LATERIPORUS Fuhrmann, 1907. 



Generic diagnosis. — Dipylidiinae : Rostellum armed with a single 

 crown of 12 to 16 hooks (120 to 170^ long), with long dorsal and short 

 ventral root, and well-developed blade. Genital pores unilateral. 

 Genital canals pass dorsal of the longitudinal excretory vessels. 

 Testicles 12 to 30 in number, behind, or at the sides of, the female 

 glands. Uterus sac-like, filling the entire medullary parenchyma in 

 gravid segments. Adults in birds. 



Type-species."' — Lateriporus teres (Krabbe, 1869) Fuhrmann, 1907. 



LATERIPORUS BIUTERINUS Fuhrmann, 1908. 



For description see Fuhrmann, 1908b, pp. 56-58, figs. 44-46. 

 Hosts. — Oidemiafusca, Oairina moscJiata, Dendrocygna autumnalis. 



LATERIPORUS TERES (Krabbe, 1869) Fuhrmann, 1907. 



For description see Krabbe, 1869b, pp. 284-285, pi. 5, figs. 106-108 {Tsenia teres).— 

 Fuhrmann, 1907b, pp 521-523, figs. 13-15. 



Hosts. — Somateria moUissima, Harelda liyemalis. 



ffl Fuhrmann in his original publication on this genus (1907b, p. 521) did not select a 

 type-species. He refers only to two species Lateriporus teres (Kisthhe) and Lateriporus 

 propeteres Fuhrmann, hence one of these under the International Code of Nomenclature 

 must be the type. Fuhrmann (1908b, p. 54; 1908a, p. 53) has selected L. spinosus 

 Fuhrmann, 1908, as type, a selection which evidently can not stand, since this spe- 

 cies is not one of the original species of the genus. 



