SOUTH AMERICAN NEMATOGNATHI. 81 



49. Tachisurus coerulescens. 



Arius caridescens Giiuther, Cat. Fish. Brit. Mus. v, 149, 1864 (Guate- 

 mala); id. Fish. Cent. Am. vi, 1866, 393 (name only); Jordan, 

 Proc. Acad. Nat. Sci. Philad. 1883, 282. 



Galekhthys coerulescens Jordan, Proc. U. S. Nat. Mus. 1885, 366 

 (name only). 



Tachisurus cnerulesce7i.s 'Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 

 vol. i, 1888, 142 (name only). 



Habitat: West Coast of tropical America. 



50. Tachisurus guatemalensis. 



Arius guatemalensis Giinther, Cat. Fish. Brit. Mus. v, 145, 1864 

 (Guatemala); Giinther, Fish. Gent. Am. vi, 1866, 393 (Chiapam; 

 Panama); Jordan & Gilbert, Bull. U. S. Fish Comm. 1882, 48 

 (Mazatlan; Colima); not Arius guatemalensis Steind. 



Galeichthys guatemalensis Jordan, Proc. U. S. Nat. Mus. 1885, 366 

 (name only). 



Tachisurus guatemalensis Eigenm. <fe Eigenm. Proc. Cal. Acad. 2d 

 Ser. vol. i, 1888, 143 (name only). 



Habitat: West Coast of tropical America. 



51. Tachisurus assimilis. 



Arius assimilis Giinther, Cat. Fish. Brit. Miis. v, 146, 1864 (Guate- 

 mala); id. Fish. Cent. Am. vi, 1866, 393, 475 (Lake of Yzabel); 

 id. Trans. Zool. Soc. 1868, i475 (locality?); Steindachner, Fisch- 

 FaunaMagd. Stromes, 2.3, 1878 (MagdalenaKiver); Jordan, Proc. 

 Acad. Nat. Sci. Philad. 1883, 281. 



Galeichthys assimilis Jordan, Proc. U. S. Nat. Mus. 1886, 559 (name 

 only). 



Tachisurus assimilis Eigenm. &- Eigenm. Proc. Cal. Acad. 2d Ser. 

 vol. i, 1888, 143 (name only). 



Habitat: East Coast of Central America. 



52. Tachisurus surinamensis. 



Hexanematichthys surinamensis Bleeker, Versl. & Mededeel. Akad. 



Wet. Amsterd. 1862, xiv, 380; id. Silures de Suriname, 55, plate 



vi, fig. 2, and plate xii, fig. 1, 1864 (Surinam). 

 Arius surinamensis Giinther, Cat. Fish. Brit. Mus. v, 148, 1864. 

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



(name only). 

 Tachisurus suriname7isis Eigenm. & Eigenm. Proc. Cal. Acad. 2d 



Ser. vol. i, 1888, 143 (name only). 

 Habitat: Surinam. 



53. Tachisurus dasycephalus. 



Arius dasycephalus Giinther, Cat. Fish. Brit. Miis. vol. v, 157, 1864 

 (Sandwich Islands); Steindachner, SB. Ak. Wien, Ixxiv, 1876, 



6 



