70 Field Columbian Museum — Zoology, Vol. V. 



61. Nototropis nazas sp. nov. 



Tvpe, No. 4375, F. C. M., 2>£ inches in length ; Santiago Papas- 

 quiaro, Durango. 



Headwaters of the Rio Nazas in Durango. 



--*«.,. ■"-. ; ■ 



Fig. 19. Nototropis nazas Meek. 



Head 4^; depth \ X / A to 4| ; D. 8; A. 8; scales 10-49 to 54—5. 

 Body elongate, not much compressed; top of head flattish, the eye 

 being much nearer the upper than the lower profile of the head; 

 snout rather pointed, slightly overhanging the mouth, 3^ in head; 

 mouth large, maxillary about reaching vertical from anterior margin 

 of pupil; maxillary 3 in head; teeth 4-4, hooked and with grind- 

 ing surface quite well developed; pharyngeal bones and teeth very 

 small; eye 3% in snout; origin of dorsal fin about midway between 

 base of caudal and anterior margin of eye; about 30 scales in a series 

 between nape and dorsal fin; base of dorsal \V A in head; its longest 

 ray i l 4 in head; pectoral x)A, in head, its tips reaching about § 

 distance from its base to base of ventrals; ventrals nearly reaching 

 anal, if in head; base of anal 2 in head; caudal fin deeply forked; 

 caudal peduncle slender, its least depth 3^3 in head; scales small, 

 smaller on upper anterior part of the body; lateral line complete. 



Color light brownish, lighter below; a narrow dark lateral band, 

 which ends in a faint caudal spot, on base of caudal rays; back finely 

 punctulate with dark dots, many being grouped to form larger dots. 

 Length about 2^ inches. Spawning time the latter part of May. 

 (Nazas, — name of the river from which the type was taken.) 



Subgenus Moniaua Girard. 

 62. Nototropis forlonensis sp. nov. 



Type, No. 4478, F. C. M., 2 inches in length; Forlon, Tamaulipas. 



Basin of the Rio Panuco. (Forlon; Valles.) 



Head sH to 4; depth 3*; D. 8; A. 9; scales 6-35-3. Body 

 elongate, considerably compressed; dorsal and ventral outlines about 

 equal; snout pointed, 4 in head; mouth terminal, oblique; end of 



