i<m " M \i'iii:\\s, Jbis Lacepede and Egatheus Billberg 95 



Though the majority of the species above belong to the family 

 Ibididae (auct.)j only two are called in the vernacular by Buffon 

 Ibis, Ulbis blanc and L'Ibis noir. Moreover, under the generic 

 heading L'Ibis, Buffon had written " Nous avons dit que les Anciens 

 distinguoient deux especes d'ibis, l'une blanche & l'autre noire." 



Further, L'Ibis blanc is the Tantalus ibis of Linne; consequently, 

 by tautonymy, this becomes the type and Richmond's suggestion 

 is confirmed; therefore Ibis Lacepede, 1799 (or Daudin, 1802) must 

 replace Pseudotantalus Ridgway (Proc. U. S. Nat. Mus., p. 550, 

 1883). Egatheus Billberg was absolutely introduced as a substitute 

 for Ibis Lacepede and must therefore follow that name and disap- 

 pear as an absolute synonym. I was not certain of this before, but 

 Dr. Richmond has satisfied me that such was the case. 



It might be noted that in the Cat. Birds Brit. Mus., Vol. XXVI, 

 p. 4, 1896, Ibis was used as of Cuvier, 1816; that was an altogether 

 different introduction, the type being /. aethiopica (Latham) by 

 tautonymy. But there was a prior Ibis of Illiger, 1811, which was 

 overlooked if Ibis Lacepede was ignored as unidentifiable, and 

 Illiger quotes Ibis Lacepede in his synonymy. 



Gray, in the Appendix List Genera Birds, p. 13, 1842, introduced 

 Threskiornis for Tantalus aethiopicus Latham, and in the Cat. Gen. 

 Subgen. Birds, p. 115, 1855, noted 'Ibis Cuv. 1817' as a synonym 

 of this group. This name must now be resumed. It will there- 

 fore be seen all of Richmond's suggested changes are necessary: 



Ibis Lacepede, Tableau Oiseaux, 1799 (or Daudin Hist. Nat.). 

 Type (by tautonymy), Ibis candidus Daudin, 1802 (= Tantalus 

 ibis Linne). 

 Synonyms: Ibis Illiger, 1811 and Egatheus Billberg, 1828, 



will replace Pseudotantalus Ridgway, 1883. 



Threskiornis Gray, Appendix List Genera Birds, p. 13, 1842. 

 Type (by original designation), Tan. aethiopicus Latham. 



Synonym: Ibis Cuvier, 1816 not Ibis Lacepede, 1799, etc., 



will replace Ibis (Cuvier) Cat. Birds Brit. Mus., Vol. XXVI, p. 4, 



1896. 



Pl.KGADIS Kaup, 1829, will remain as used in the Cheek-List North 



Amer. Birds, 3rd Ed., 1910, p. 92, but the Family name of the 



Ibises, ibid., p. 91, will become Plegadidae. 



