627 



T. sphenocephala Rud., 1819 and crassula Rud., 1819, are evi- 

 dently the earliest specific names to which we can refer with 

 certainty, although the earlier names may be looked upon as 

 probable but unid en tillable synonyrms. According to page- 

 priority T. sphenocephala should stand, but as that is an un- 

 certain earlier synonym, and as Railliet has already used 

 crassula, I retain the latt<?r name for the present. 



There are certain other species which must be con- 

 sidered in couuecticn with this genus, but most of 

 which are but little known at present. The followinj; 

 characters are talcen from Krabbe (1869) and Blan- 

 chard (1891, pp. 434-438): 



A. Avian parasites: 



Davainea struthionis (Parona, 1885)— Syn. 1810, Taenia 

 sti-uthio cameli Rudolphi, nomen nudum; 1819, T. struthionis 

 Rudolphi, nomen nudum; 1819, T. struthionis Rudolphi, nomen 

 nudum; 1885, T. struthionis Parona; 1893. T. (Davainea) 

 struthionis von Linstow.) Parona's description of this para- 

 site from ostriches is not accessible to me. 



Davainea insignis (Steudener, 1877) R. Bl., 1891 (Syn. 1877. 

 Taenia insignls Studener). lOOmm to ISOmm long; rostellum 

 armed with double crown of minute hooks; suckers also armed 

 with gyriniform hooks, smaller than those of the rostellum, 

 points directed inward; host: Carpophaga oceanica. (Original 

 not at my disposal, I quote from R. Blanchard, 1891, pp. 434- 

 435.) 



Davainea australis (Krabbe, 1869) R. Bl., 1891 (Syn. 1S69. 

 Taenia australis Krabbe). Strobila 400mm long. 1.2mm broad; 

 rostellum with a double row of 340-360 hooks 12 fi to 14 fi long: 

 suckers with hooks, 5 fi to 11 fi long; genital pores unilateral; 

 host: Dromaius Novae-Hollandiae. 



Davainea urogalli (Mode^r, 1790) R. Bl.. 1891. (Syn. after 

 Krabbe 1869, p. 344; 1846, Taenia tumens Mehlis; 1850, T mi- 

 crops). Strobila 300mm long; rostellum with double crown of 

 ca. 100 hooks 10-11 fi long; genital pores unilateral; hosts: 

 Tetrao urogallus; Tetrao tetrix; Cacabis saxatilis; Centrocerus 

 urophasianus; Tetraogallus himalayanus. 



Davainea frontina (Dujardin, 1845) R. Bl.. 1891. (Syn. after 

 Krabbe, 1869: 1810, Taenia crateriformis Rudolphi. pars; 1845. 

 T. frontina Dujardin.) Strobila 100mm long by 1mm broad; 

 head 380 fi broad, rostellum 126 /i surrounded by a double crowr 

 of about 300 hooks 8 /" long; suckers 140 fi in diameter, armed 



