76 BIJT.LETTN 69, TTNTTED STATES NATIONAL MUSEUM, 



CHOANOT^NIA POROSA (Rudolphi, 1810) Cohn, 1899. 



For description see Krabbe, 1869b, pp. 260-261, pi. 1, figs. 10-13 (Txnia 

 porosa). ^Conn, 1901b, pp. 368-372, pi. 32, figs. 48-50.— Clerc, 1903, 

 p. 320, pi. 11, fig. 86. 



Hosts. — Rissa tridadyla, Larus marinus, Larus argentatus, Larus 

 californicus, Larus canus, Larus minutus, Sterna Jiirundo. 



CHOANOT^NIA STELLIFERA (Krabbe, 1869) Fuhrmann, 1908. 



For description see Krabbe, 1869b, p. 274, pi. 3, figs. 67, 68 (Taenia stellifera); 

 1882a, p. 352, pi. 1, fig. 8 {T. stellifera). 



Host. — Scolopax rusticola. 



CHOANOT-ffiNIA STERNINA (Krabbe, 1869) Clerc, 1903. 



For description see Krabbe, 1869b, pp. 259-260, pi. 1, figs. 7-9 {Tsenia ster- 

 mna).— Clerc, 1903, pp. 320-321. 



Hosts. — Larus canus, Sterna Jiirundo, Sterna paradissea. 



Genus MONOPYLIDIUMo Fuhrmann, 1899. 



Generic diagnosis. — Dipylidiinse : Rostellum armed with a double 

 or single crown of hooks. A single set of reproductive organs in 

 each segment. Genital pores irregularly alternate, rarely unilateral. 

 Genital canals pass between the longitudinal excretory vessels and 

 dorsal of the longitudinal nerve or dorsal of both excretory vessels. 

 Testicles numerous (20 to 40 or more), behind the female glands or, 

 also, laterally on both sides of the latter. Vas deferens coiled; seminal 

 vesicle absent. Uterus breaks down into egg capsules, each con- 

 taining one or several eggs. Adults in birds. 



Type-species. — Monopylidium musculosum (Fuhrmann, 1896) 

 Fuhrmann, 1899. 



MONOPYLIDIUM CINGULIFERUM (Krabbe, 1869) Clerc, 1902. 



For description see Krabbe, 1869b, p. 272, pi. 3, figs. 59, 60 ( Tsenia cingulifera). — 

 Clerc, 1903, pp. 356-359, pi. 9, fig. 43; pi. 10, figs. 49, 51. 



Hosts. — jEgialitis dubia, Totanus totanus, Machetes pugnax, Pisohia 

 damacensis. 



MONOPYLIDIUM MACRACANTHUM Fuhrmann, 1907. 



For description see Fuhrmann, 1907b, pp. 530-531, fig. 33. 



Host. — Helodromas ocTiropus. 



MONOPYLIDIUM MUSCULOSUM (Fuhrmann, 1896) Fuhrmann, 1899. 



For description see Fuhrmann, 1896n, pp. 122-127, pi. 4, figs. 6-9 ([fDavainea] 

 musculosa); 1899f, pp. 622-627. 



Host. — Sturnus vulgaris. 



MONOPYLIDIUM PASSERINUM Fuhrmann, 1907. 



For description see Fuhrmann, 1907b, pp. 528-529, figs. 28, 29. 



Host. — Passer domesticus. 



MONOPYLIDIUM ROSTELLATUM Fuhrmann, 1908. 



For description see Fuhrmann, 1908b, pp. 63-65, fig. 52 



Host. — Himantopus mexicanus. 



"See footnote under Choanotsenia, p. 74. 



