292 THE AMERICAN CHARACIDAE. 



are nine with two teeth, two with three, five with four, five with five, five with 

 six, five with seven, three with eight, and one with nine on the maxillary. 



Three have twenty-seven anal rays, twelve twenty-eight, eight twenty- 

 niiie, ten thirty, three thirty-two; average twenty-nine. 



It is possible that the specimens with numerous maxillary teeth are all 

 males. 



In general characters the specimens agree with the specimens of A . aeneus, 

 and those with but two maxillary teeth are indistinguishable from them. The 

 fact that such a large per cent of specimens have a large number of maxillary 

 teeth entitles them to a separate name. 



The Field Museum contains n\mierous specimens collected in Lake Nicara- 

 gua (S. E. Meek). 



47. AsTYANAX ANGUSTiFRONS (Regan). 



Tetragonopterus angustifrons Regan, Biologia Central! Americana. Fishes, 1907, p. 172, pi. 26; fig. 5 



(Mexico). 

 Astyanax angustifrons Eigenmann, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 433. 



Habitat. — Some part of Mexico. 



Head 3r^; depth 3; D. 11; A. 26-29; scales 7 or 8-34 to 38-6 or 7; eye 3 

 in head, interorbital 3^-3 i. 



Snout subconical, f as long as eye. Maxillary extending to the vertical 

 from anterior edge of pupil; three to five maxillary teeth. Origin of dorsal 

 behind ventrals, its longest ray f to i in the head; free edge of fin slightly convex. 

 Anal slightly emarginate; Pectoral f the head, about reaching ventrals which 

 extend nearly to anal; caudal peduncle longer than deep. Coloration as in 

 A. mexicanus. 



48. Astyanax fasciatus (Cuvier). 

 Plate 45, fig. 1-7; Plate 49, fig. 2, 3; Plate 50, fig. 2; Plate 95, fig. 1. 



Chalceus fasciatus Cuvier, Mem. Mus. hist, nat., 1819, B, p. 352, [? pi. 26, fig. 2] (Brazil); Schomburgk, 

 Fishes Brit. Guiana, 1841, 1, p. 215 (Paduiri). 



Tetragonopterus fasciatus Cuvier & Valenciennes, Hist. nat. poisson, 1848, 22, p. 149 (Rio San Fran- 

 cisco); GtJNTHER, Cat. fishes Brit, mus., 1864, 5, p. 322 (Brazil; ?West Ecuador; ?Rio Chisoy; 

 ?Mexico; Guatemala); Aim.mag.nat.hist.,1880,ser.5,6, p. 12 (LaPlata); Perugia, Ann. Mus. civ. 

 storia nat. Gonova, 1891, ser. 2, 10, p. 44 (Candelaria) ; Eigenmann & Eigenmann, Proc. U. S. N. M., 

 1893, 16, p. 55; Eigenmann & Ivennedy, Proc. Acad. nat. sci. Phil., 1903, p. 521 (Arroyo Pypucu; 

 Arroyo Chagalahna); Boulenoer, Boll. Mus. univ. Torino, 1897, 12, no. 279, p. 3 (Lesser); 

 Vaillant, ?Bu11. Mus. hist, nat., 1897, 3, p. 221 (Chagres); 1899, 5, p. 155 (Rio Carnot). 



