684 Bulletin 47, United States National Museum. 



311. BELONESOX, Kner. 



Belanesox, KNER, Sitzgsber. Akad. Wiss. Wien, 1860, XL, 419, (belizanus). 



Cleft of mouth much developed laterally, the jaw bones being much 

 produced, making a beak like that of Labidesthes. Premaxillaries form- 

 ing together an elongate triangular plate, but not anchylosed together. 

 Mandible long, somewhat prominent ; each jaw with a broad band of 

 cardiform teeth. Scales small. Anal in advance of dorsal, modified 

 in the male into an intromittent organ. Branchiostegals 6. Intestinal 

 canal short. Carnivorous. Mexico. (Belone-, Esox.) 



1006. BELONESOX BELIZANUS, Kner. 



Head 2f to 3; depth 5 to 6. B. 6; D. 9; A. 10 or 11; V. 6; scales 

 56 to 63-18. Upper surface of the premaxillary plate as longaspostorbital 

 part of head. Length of base of dorsal more than i its distance from 

 caudal in males, and \ in females. Brownish olive above; sides with 

 longitudinal series of black dots ; a round black spot on the root of the 

 caudal. Anal process of male composed of 3 rays, and as long as head. 

 Southern Mexico, Honduras, and Guatemala; a curious fish, reaching a 

 considerable size, the females 7 inches, the male 4 in length, (belizanus, 

 from Belize.) 



Belonesox belizanus, KNER, Sitzgsber. Akad. Wiss. Wien, 1860, 419, with figure, Belize; GtiN- 

 THER, Cat., vi, 333, 1866; JORDAN & GILBERT, Synopsis, 345, 1883. 



312. ANABLEPS (Artedi) Bloch. 



(FOUR-EYED FISHES.) 



Anableps (ARTEDI) BLOCH, Ichthyologia, vni, 7, 1795, (letrophlhalmus = anableps). 



Body elongate, depressed anteriorly and compressed posteriorly. Head 

 broad and depressed, with the supraorbital part very much raised. Cleft 

 of mouth horizontal, of moderate width, the mandible being short, 

 having, however, its bones firmly united; upper jaw protractile. Both 

 jaws armed with a band of villiform teeth, those of the outer series 

 being largest and somewhat movable. The integuments of the eye are 

 divided into an upper and lower portion by a dark-colored transverse 

 band of the conjunctiva; also the pupil is incompletely divided into 2 

 by a pair of lobes projecting from each side of the iris. Nasal opening 

 produced into a short tubule depending from each side of the mouth. 

 Scales rather small or of moderate size. Dorsal and anal fins short, the 

 former behind the latter ; anal fin of male modified into a thick and 

 long scaly conical organ with an orifice at its extremity. Intestinal 

 tract but little convoluted. Gill membranes of both sides united for 

 a short distance, and not attached to the isthmus. Vertebrae about 46. 

 Fresh waters of South America, one species ranging northward to south- 

 ern Mexico ; extraordinary fishes, swimming at the surface of the water 

 and feeding on insects, the eye divided by a horizontal partition into a 

 lower portion for water use, and a portion for seeing in the air. 

 , to look upward.) 



