SOUTH AMERICAN NEMATOGNATHI. 53 



Caudal fin broadly lunate, the upper lobe longer, fal- 

 cate, 3f in the length. 



Anal fin higher than long, the highest ray 2-2| in 

 the head. 



Ventrals reaching to the anal, I2-2 in the head. 



Pectoral spines broken in all the specimens. 



Back, top of head and a band from humeral process 

 to the lower caudal lobe, blue-black; a broad conspicu- 

 ous, bluish-silvery band along the lateral line; lower 

 parts white; fins blackish; ventrals and anal sometimes 

 with light areas. 



Head 3h; depth 4^-5*; D. I, 7; A. 14-16. 



Eleven specimens .25-. 35 m. long. Callao, Peru. 

 Hassler Expedition. 



25. Tachisurus flavescens. 



BagruH flavi'srni.f: Guv. & Val. Hist. Nat. Poiss. xiv, 462, 18.39 

 (Cayenne); Kner, SB. Ak. Wien, xxvi, 1857, 386 (locality?). 



Arius flavescens Giinther, Cat. Fish. Brit. Mns. v, 151, 1864 (copied). 



Galeichthys flavescens Jordan, Proc. U. S. Nat. Mns. 1886, 559 (name 

 only). 



Tachisurus flavescens Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 

 vol. i, 1888, 141 (name only). 



Habitat: Cayenne. 



This species is known to us only from descriptions. 



26. Tachisurus temminkianus. 



Barjrus temminkianus C\\\ . & Val. Hist. Nat. Poiss. xiv, 463, 1839 



(Cayenne). 

 Arius temminckii Giinther, Cat. Fish. Bi-it. Mus. v, 151, 1864 



(copied). 

 Galeichthys temminkianus Jordan, Proc. U. S. Nat. Mus. 1886, 559 



(name only). 

 Tachisurus temminhianus Eigenm. & Eigenm. Proc. Cal. Acad. 2d 



Ser. vol. i, 1888, 141 (name only). 

 Habitat: Cayenne. 



27. Tachisurus emphysetus. 



Bagrus (Sciades) einphysetus Miiller & Troschel, Horte Ichthyol. iii, 



8, 1849 (Surinam). 

 Arius em,physetus Giinther, Cat. Fish. Brit. Miis. v, 150, 1864 (copied). 

 Sciades emphysetus Bleeker, Nederl. Tijdscbr. Dierkunde, i, 1863, 91 



(name only). 



