6o 



Field Columbian Museum — Zoology, Vol. V. 



Aztecula azteca Meek, Field Col. Mus. Pub. 65, 1902, 81; Texcoco; 



Chaleo. 

 Valley of Mexico and headwaters of the Rio Balsas at Puebla 

 (Viga Canal; Chaleo; Puebla: Xochimilco.) 



Fig. 13. Aztecula vittata (Girard). 

 No. 4 ; 5&9 {Notroi>is aztectts Woolman), U. S. National Museum. 



Head 4; depth 3^ to 4; D. 8; A. 8; scales 7-50-5. Body robust, 

 back moderately arched, the highest point over pectorals; snout 

 bluntish, 4^2 in head; mouth small, oblique; maxillary scarcely 

 reaching vertical from front of eye, 3%" in head; teeth 4-4; eye small, 

 4>2 in head; origin of dorsal midway between base of caudal and eye; 

 about 23 scales in a series between nape and dorsal fin; pectoral fin 

 short, 1 § in head; ventral i| ; caudal fin forked; caudal peduncle rather 

 stout, its least depth 2 in head; lateral line decurved. wavv, complete. 



Color dark brown above, lighter below; a dark lateral band more 

 distinct on posterior half of body ; the band rnore prominent in young 

 examples; caudal spot very indistinct. 



This species is very abundant in the lakes and canals about the 

 City of Mexico. I also took six specimens of this species from the 

 river at Puebla and a number of small ones from a pond near by. Its 

 appearance in the Balsas basin was rather unexpected. There is 

 a quite deep artificial pond at Santa Maria, near Puebla, in which 

 are fishes of this species which were probably brought from the lakes 

 near the City of Mexico, and have escaped into the river near by. 



52. Aztecula lermae (Evermann & Goldsborough) . 



Notropis lerma Evermann & Goldsborough, Bull. U. S. Fish Comm., 

 1902, 147, fig. 3; Lago de Lerma, Mexico. 



Basin of the Rio Lerma. (Lerma.) 



Head z 2 A\ depth t, 2 ^; D. 9; A. 8; scales 7-47-5. Body stout, 

 deep, not much compressed, the dorsal region gently elevated; head 



