452 CALIFORNIA ACADEMY OF SCIENCES. 



444, Callichthys callichthys, 



Callichthys tnmoata Linu;T>us, Mus. Ad. Fred. 1754, 73; Bleeker, 

 Silures de Suriname, 22, 1864 (Surinam). 



Silurus calUchthy* Linmeus, Syst. Nat. ed. x, 307, 1758 (America); 

 ed. xii, 506, 1766; Gmeliii, L. Syst. Nat. i, 1361. 



Cataphractus callychthis Block, Ausl. Fisclie. viii, 86, pi. 377, fig. 1, 

 1794 (after a figure by Prince Maurice, much changed in copy- 

 ing); Bloch & Schneider, " Syst. Ichthyol. 107," 1801; Lacepede, 

 Hist. Nat. Poiss. v, 124, 1803 (the two Indies). 



Cataphractus callichthys Eigenm. & Eigeuni. Proc. Cal. Acad. 2d 

 Ser. i, 164, 1888 (Kio Janerio; Pernambuco; Juiz de Fora; Bahia; 

 Mendez; Macacos; Porto Seguro; Surinam). 



Callichthys asper Quoy & Gaim. Voy. Uran. Zool. 232, 1829; Cuv. & 

 Val. Hist. Nat. Poiss. xv, 302, 1840 (Cayenne; Eio Janerio); 

 Kner, SB. Ak. Wien, xvii, 1855, Ichthyol. Beitr. 107 (Par;i Kio; 

 Surinam; Bahia); Castelnau, Anim. Nouv. Kares de 1'Amer. du 

 Sud, 38, 1855 (Bahia), name only; Bleeker, Ichthyol. Arch. 

 In. Siluri, 53, 1858; Giiuther, Cat. Fish. Brit. Mus. v, 226, 

 1864 (Bahia; Para); Cope, Proc. Am. Philos. Soc. xvii, 681, 1878 

 (Nauta). 



Cataphractus depressus Swainson, Fishes Eept. etc. ii, 304, 1839, 

 based on Bloch, pi. 377. 



Callichthys ccelatus Cuv. & Val. Hist. Nat. Poiss. xv, 308, 1840 (Rio 

 Janeiro); Giinther, 1. c., 227, 1840 (copied). 



Callichthys Iceviceps Cuv. & Val. 1. c. xv, 309=5 . 



Callichthys loricatus Gronow, "Cat. Fish. 157," 1854. 



Callichthys kneri Gill, Syii. Fish. Trinidad, W. I. Ann. Lye. Nat. 

 Hist. N. Y. vi, 394, 1858 (Trinidad); Giinther, 1. c. 227, 1864 

 (copied); Liitken, Vid. Medd. 1873, No. 18, 214-217 (Trinidad); 

 Jordan, Proc. U. S. Nat. Mus. 1886, 559 (name only). 



Callichthys afinis Giinther, 1. c. 226, 1864 (Rio Grande). 



Callichthys hemiphractus Hensel, Wiegrn. Arch. 1868, i, 374 (Costa 

 da Serra)=the young. 



Habitat: La Plata to Trinidad. 



Callichthys ccelatus is said to differ from this species in 

 the number of dorsal rays, there being 6 instead of 7 or 

 8. The nuchal plates are also said to differ slightly. 



Callichthys loricatus we have placed here on the au. 

 thority of Dr. Giinther. 



As there are no characters mentioned in the de- 

 scription of C. knei'i by which that species can be sepa- 

 rated from C. calliMy*, we see no reason why it should 

 be kept distinct. 



