NO. 15 VAN CLEAVE : ACANTHOCEPH ALA 513 



Southwellina hispida (Van Cleave, 1925) Witenberg, 1932 



(Plate 54, fig. 17) 



Synonymy: Arhythmorhynchus hispidus Van Cleave, 1925 

 Arhythmorhynchus fuscus Harada, 1929 



Host: An undetermined heron. Indefatigable Island, Galapagos, 

 January 20, 1934 



Under the name Arhythmorhynchus hispidus j the vi^riter (1925) de- 

 scribed 5 specimens of immature worms taken from mesenterial cysts 

 of Rana nigromaculata of Musashi Province, Japan. In 1929, Fukui 

 described the adult of this species from the intestine of Nycticorax nyc- 

 ticorax nycticorax (Linn.) from Shizuoka Province. In the same year, 

 Harada described apparently the same species as Arhyth?norhynchus 

 fuscus from the same host as recorded by Harada. Fukui (1929, p. 270) 

 and Yamaguti (1935, p. 269) both list A. fuscus as a direct synonym 

 of A. hispidus, while the latter accepted the proposal of Witenberg 

 (1932), who recognized this species as genotype of his new genus South- 

 wellina, changing the termination of the specific name to agree with 

 the gender of the generic name. The valid name thus became Southwell- 

 ina hispida (Van Cleave, 1925). 



To date, all published records of the occurrence of this species have 

 been confined to hosts taken in Japan. It was with some surprise that 

 the author encountered 4 specimens (2 males and 2 females) of this 

 species in material removed from the intestine of an unidentified heron 

 on Indefatigable Island, January 20, 1934. The species probably has 

 broad geographical distribution that has not yet been adequately under- 

 stood 



Gentrorhynchus spinosus (Kaiser, 1893) 

 (Plate 55, figs. 19, 20) 



Synonymy: Echinorhynchus spinosus Kaiser, 1893 



Gentrorhynchus spinosus Van Cleave, 1916 

 Host: "Galapagos hawk," Galapagos Islands, January 22, 1934 

 Echinorhynchus spinosus was originally described by Kaiser from an 

 unrecorded host from Florida. The present writer (Van Cleave, 1916), 

 misinterpreting Kaiser's description, described and renamed the same 

 species Gentrorhynchus spinosus. Several birds, all from Florida, have 

 been listed as hosts for this species. 



