68 Field Columbian Museum — Zoology, Vol. V. 



Graodus nigrotceniatus Giinther, Cat., vn, 485, 1868; Atlixco, 

 Mexico. 



Notropis nigrotceniatus Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1896, 264: Jordan & Snyder, Bull. U. S. Fish Comm. 

 1900, 121; Rio Ixtla, Puente de Ixtla, Morelos: Meek, Field 

 Col. Mus. Pub. 65, 1902; Balsas; Puente de Ixtla. 



Basin of the Rio Balsas. (Cuautla; Yautepec; Jojutla; Atlixco; 

 Matamoras ; Chietla.) 



Head 4; depth 4; D. 8; A. 8; scales 7-36 to 38-4. Body elongate, 

 very robust, not much compressed, back little elevated; head large; 

 snout blunt, 3^ in head; mouth moderate, maxillary reaching to 

 vertical from anterior margin of orbit ; teeth 4-4 ; eye 3 f to 4 in head ; 

 origin of dorsal slightly nearer tip of snout than base of caudal; base 

 of dorsal 2 in head; longest dorsal ray 1% in head; about 16 scales 

 in a series between the nape and dorsal fin; pectorals i l { in head; 

 ventrals 1%; base of anal 2%; caudal forked; caudal peduncle rather 

 robust its least depth 2 in head; lateral line complete, slightly de- 

 curved. 



Color dark brownish above, much lighter below; sides with a 

 dark lateral band, more prominent on smaller specimens and on 

 posterior half of body, ending in a black caudal spot; fins plain. 

 Length about zH inches. 



Mr. C. Tate Regan, of the British Museum, London, has kindly 

 examined the types of Leuciscus boucardi and Graodus nigrotceniatus, 

 and he considers both to be the same species. This decision agrees 

 with the result of my study of the minnows of the Balsas Basin. 

 This species is in North America the most southern member of the 

 family to which it belongs. Specimens taken at Yautepec on March 

 26th have the ovaries well developed, indicating the spawning season 

 to be in April. 



Subgenus Oodoma Girard. 



59. Nototropis ornatus (Girard). 



Codoma ornata Girard, Proc. Acad. Nat. Sci. Phila., 1856, 195; 

 Rio Chihuahua: Girard, Mex. Bd. Sur., 59, pi. xxix, figs. 

 22-25, I 8S9'. Ri° Chihuahua and its tributaries. 

 Notropis ornatus Woolman, Bull. U. S. Fish Comm., 1S94, 58, Rio 

 Conchos, Chihuahua: Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1896, 27: Meek, Field Col. Mus. Pub. 65, 1902, 83; 

 Chihuahua; San Andres; Jimenez; Minaca. 

 Headwaters of the Rio Mezquital and the Rio Nazas, in Durango, 

 to the upper tributaries of the Rio Yaqui and the Rio Conchos, in 

 Chihuahua. (Santiago Papasquiaro; Durango.) 



