136 Field Columbian Museum — Zoology, Vol. V. 



band of villiform teeth, those of the outer series being largest and 

 somewhat movable; the integuments of eye divided into an upper 

 and lower portion by a dark colored transverse band of conjunctiva; 

 pupil also incompletely divided into two pair of lobes projecting from 

 each side of the iris; nasal opening produced into a short tubule 

 depending from each side of the mouth ; dorsal fin behind anal ; anal 

 fin of male modified with a thick and long scaly conical organ with 

 an orifice at its extremity; alimentary canal but little convoluted; 

 vertebrae about 46. 



126. Anableps dovii Gill. Four-eyes; Cuatro Ojos. 



Anableps dowei Gill, Proc. Acad. Nat. Sci. Phila., 1861, 4; Panama. 



Anableps dovii Giinther, Cat., vi, 338, 1866: Jordan & Evermann, 

 Bull. 47, U. S. Nat. Mus., 1896, 685; Chiapam, Guatemala: B. A. 

 Bean, Proc. U. S. Nat. Mus., 1898, 541; Tequisistlan, 40 miles 

 from the sea: Evermann & Goldsborough, Bull. U. S. Fish 

 Comm., 1901, 150; Tehuantepec River at Tehuantepec. 



Rio Tehuantepec to the Isthmus of Panama. 



Head 4; D. 9; A. 10; scales 65 to 70. Body elongate, head flat, de- 

 pressed. 



Color blackish brown, with a well-defined broad golden band along 

 the sides from axis of pectoral to the base of the caudal; fins pale. 

 Length 7 or 8 inches. 



According to Mr. E. W. Nelson, the individuals of this species 

 swim always at the surface and in little schools arranged in platoons 

 or abreast. They swim headed against the current and feed upon 

 floating matter which the current brings them. They may make 

 slight headway up stream or may gradually float down stream at a 

 speed less than that of the current. They are easily frightened, and 

 when a school becomes scattered, and after the cause of their fright 

 has disappeared, the individuals will soon rejoin each other. The 

 species is viviparous. A female 7 inches in length, collected in April, 

 was examined by Dr. Evermann, who found it to contain 9 young, 

 each 1.5 inches in length. 



Subfamily Goodinse. 



57. Groodea Jordan. 

 Goodea Jordan, Proc. U. S. Nat. Mus., 1879, 299. (Type, Goodea 



atripinnis Jordan.) 



Xenendum Jordan & Snyder, Bull. U. S. Fish Comm., 1899, 127. 



(Tvpe, Xenendum caliente J. & S. =Goodea atripinnis Jordan.) 



Bodv elongate to rather robust ; dorsal fin posterior, about over anal 



fin ; anal fin of males with its first 5 or 6 rays short and stiff and sepa- 



