Family V. Cyprinid^. 8i 



Body • robust or elongate ; mouth terminal or inferior, with a 

 barbel present and terminal on maxillary; a second barbel some- 

 times present on each side; premaxillaries protractile; teeth 4-4 or 

 1, 4-4, 1 or o, hooked, with narrow grinding surface; scales rather 

 large, 35 to 60 in the lateral line; lateral line complete; males usually 

 with tubercles on snout in breeding season, and sometimes flushed 

 with red. A small group of fishes usually inhabiting river channels. 



KEY TO THE SPECIES OF HYBOPSIS. 



a. Body slender, 5^3 in, in length; scales 36 in page 



the lateral series; mouth moderate, inferior; 

 the snout projecting and rather pointed; color 

 silvery, everywhere sprinkled with dark dots aestivalis 81 



aa. Body more robust, 3^ to 4^; mouth large 

 oblique, terminal, the lower jaw slightly in- 

 cluded; scales 45 in the lateral line; color sil- 

 very without dark dots altus 81 



76. Hybopsis aestivalis (Girard). 



Gobio aestivalis Girard, Proc. Acad. Nat. Sci. Phila., 1856, 189; 

 Rio San Juan, near Cadereita, Nuevo Leon: Girard, Mex. 

 Bd. Sur., 49, pi. lvii, figs. 17-29, 1859; Rio San Juan near 

 Cadereita, Nuevo Leon. 

 Hybopsis csstivalis Woolman, Bull. U. S. Fish. Comm., 1894, 56; 

 Rio Grande, El Paso, Texas: Jordan & Evermann, Bull. 47, 

 U. S. Nat. Mus., 1896, 316. 

 Northeastern Mexico north to the upper tributaries of the Rio 

 Grande in New Mexico, and to the Arkansas River in Arkansas. 

 (San Juan; Linares.) 



Head 3%"; depth 5^; D. 8; A. 8; scales 6-36-4. Body slender, 

 with long caudal peduncle, the back scarcely elevated; head long 

 and slender; the snout much projecting and rather pointed; mouth 

 moderate, inferior, the maxillary reaching posterior nostril; barbels 

 long, nearly as long as snout, about 3 in head; each maxillary with 

 single barbel; eye small 4 to 4^2 in head; fins rather long, the caudal 

 deeply forked, its lobes subequal; origin of dorsal over ventrals 

 nearer tip of snout than base of caudal. 



Color silvery, everywhere sprinkled with small black dots; fins 

 plain. Length about 3 inches. This species spawns during the latter 

 part of June. 



77. Hybopsis altus (Jordan). Pescada Blanca. 



Hudsonius altus Jordan, Proc. U. S. Nat. Mus., 1879, 301; Lago 

 deTupatara, Guanajuato : Bean, Proc. U. S. Nat. Mus. 1896, 322. 



