102 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. 



Genus ACOLEUS Fuhrmann, 1899. 



Generic diagnosis. — Acoleidse: Scolex with armed rostellum. A 

 single set of reproductive organs in each segment. Male genital pores 

 regularly alternate. Cirrus pouch passes ventral of longitudinal 

 excretory vessels and nerve. Testicles numerous. Vagina functions 

 as a very large seminal receptacle. Adults in birds. 



Type-species, — Acoleus armatus Fuhrmann, 1899 = Acoleus vagiTuitus 

 (Rudolphi, 1819) Fuhrmann, 1900. 



ACOLEUS VAGINATUS (Rudolphi, 1819) Fuhrmann, 1900. 



For description see Fuhrmann, 1899e, pp. 620-622, figs. 4-6 (^1. armatus); 1899g, 

 pp. 347-350, pi. 17, figs. 10-14 {A. armatus); 1900c, pp. 369-370. 



Host. — Himantopus mexicanus. 



Genus GYROCCELIA Fuhrmann, 1899. 



Brochocephalus Linstow, 1906 (type, B. paradoxus Linstow, 1906; see Fuhrmann, 

 1908a, p. 86). 



Generic diagnosis. — Acoleidse: Rostellum armed with a single 

 crown of hooks arranged in a zigzag row having eight angles. A 

 single set of reproductive organs in each segment. Male pores 

 irregularly alternate. Cirrus pouch passes between the longitudinal 

 excretory vessels and dorsal of the nerve. Testicles few. Seminal 

 receptacle very small. Uterus ring-like with numerous outpocket- 

 ings and with an opening in gravid segments dorsally and ventrally. 

 Adults in birds. 



Type-species. — Gyrocodia perversus Fuhrmann, 1899. 



GYROCCELIA PARADOXA (Linstow, 1906). 



For description see Linstow, 1906, p. 183, pL 2, figs. 36, 38; pL 3, figs. 35, 37 

 (Brochocephalus paradoxus) .C' 



Host.—jEgialitis mongola. 



Genus DIPLOPHALLUS Fuhrmann, 1900. 



Generic diagnosis. — Acoleidse: A double set of male reproductive 

 organs an^ a single set of female organs in each segment. Two 

 vaginse functioning as large seminal receptacles. Adults in birds. 



Type-species. — DiplopJiallus polymorpJius (Rudolphi, 1819, partim 

 Krabbe, 4869) Fuhrmann, 1900. 



DIPLOPHALLUS POLYMORPHUS (Rudolphi, 1819) Fuhrmann, 1900. 



For description see Krabbe, 1869b, pp. 301-302, pL 7, figs. 163, 164 (Taenia 

 polymorpha). — Wolffhugel, 1900a, pp. 136-152, pL 5, figs. 67-80, pL 6, figs. 

 81-84 (Taenia polymorpha) .—Cohn , 1900c, pp. 277-288, pL 15, figs. 19-22 

 (Taenia polymorpha). — Fuhrmann, 1900c, p. 371. 



Host. — Himantopus mexicanus. 



a Fuhrmann (1908a, p. 86) examined the original material of Brochocephalus para- 

 doxus and found that this species belongs in Gyroccelia in spite of Linstow's different 

 description. 



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