SOUTH AMERICAN NEMATOGNATHI. 71 



shading into silvery below the lateral line; the fins 

 brownish, the pectorals bluish on the inner side of the 

 membrane. 



Head 3i-3|; depth 6i-5J; D. I, 7; A. 18. 



The female differs in having the ventrals extended to 

 the anal, their length 1J in head, the dorsal spine l|-2 

 in head; a large oval patch of teeth on the pterogoids, separ- 

 ate from the palatine patches, as in alatus. 



The specimens examined are from .24-.41 m. long, 

 collected at Panama, by Dr. Steindachner, Hassler Ex- 

 pedition. 



40, Tachisurus insculptus. 



Arius insculptus Jordan & Gilbert, Bull. U. S. Fish. Comm. 1882, 41 



(Panama). Jordan & Gilbert, Proc. U. S. Nat. Mus. 1882, 622 



(Panama). 

 Galeichthys insculptus Jordan, Proc. U. S.Nat. Mus. 1885, 366 (name 



only). 

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



vol. i, 1888, 143 (name). 

 Habitat : Panama . 



41, Tachisurus planiceps, 



Arius planiceps Steindachner, SB. Ak. Wien, Ixxiv, 1876, Ichthyol. 



Beitr. iv. 26, pi. iv (Panama; Altata); Jordan & Gilbert, Bull. 



U. S. Fish Comm. 1882, 24 (Panama), id. Proc. U. S. Nat. Mus. 



1882, 622 (Panama). 

 Galeichthys planiceps Jordan, Proc. U. S. Nat. Mus. 1885, 366 (name 



only). 

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



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

 Habitat : Panama . 



42, Tachisurus platypogon, 



Arius platypogon Giinther, Cat. Fish. Brit. Mus. v, 147, 1864 (Guate- 

 mala); id. Fish. Cent. Am. vi, 1866, 393 (San Jose); Steindach- 

 ner, SB. Ak. Wien, Ixxiv, 1876, Ichthyol. Beitr. iv, 17, (Callaoto 

 Magdalena Bay); Jordan & Gilbert, Bull. U. S. Fish. Comm. 

 1882, 44 (Mazatlan; Libertad; Punta Arenas; Panama). 



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

 (Libertad; Arenas). 



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

 vol i, 1888, 142 (Panama; Acapulco). 



Habitat: West Coast tropical America. 



