FAMILY V. CYPRINID^E. 41 



bladder suspended in the abdominal cavity, and entirely surrounded 

 by many convolutions of the long alimentary canal, which is 6 to 9 

 times the length of the body; ovaries similarly inclosed by the ali- 

 mentary canal ; peritoneum black ; pseudobranchiae present ; lateral line 

 present ; anal fin short ; dorsal nearly over ventrals. 



The surrounding of the air bladder by many convolutions of the 

 alimentary canal is peculiar to this group of fishes. During the breed- 

 ing season, which occurs in the spring, the males are covered with 

 large tubercles, those on the head being the largest. 



KEY TO THE SPECIES OF CAMPOSTOMA. pAGE 



a. Scales small, about 70 to 75 in the lateral series. . . .ornatum 41 

 aa. Scales larger, about 40 to 55 in the lateral series. 



b. Scales in the lateral series, about 53 anomalum 42 



bb. Scales in the lateral series, about 46 formosuJum 42 



32. Campostoma ornatum Girard. 



Campostoma ornatum Girard, Proc. Acad. Nat. Sci. Phila., 1856, 

 176; Rio Chihuahua, Mexico: Girard, Mex. Bd. Sur., 4, pi. xiv, 

 figs. 1-4, 1858; Rio Chihuahua, Mexico: Giinther, Cat., vn, 

 183, 1868: Woolman, Bull. U. S. Fish Comm., 1894, 57; Rio 

 Chihuahua, Chihuahua: Woolman, Ibid., 1894, 61; Rio Lerma, 

 Salamanca, Guanajuato (there is some mistake in regard 

 to this reference, for it is quite evident that this species does 

 not occur in the Lerma Basin): Jordan & Evermann, Bull. 

 47, TJ. S. Nat. Mus., 1896, 205: Rutter, Proc. Cal. Acad. Sci., 

 1896, 259; Rucker Canon, trib. Rio Yaqui, Chiricahua Mts., 

 Arizona: Evermann & Goldsborough, Bull. U. S. Fish Comm., 

 1902, 146; Colonia Garcia, Chihuahua: Meek, Field Col. Mus. 

 Pub. 65, 1902, 77; Colonia Juarez; Chihuahua; San Andres; 

 Santa Rosalia; Jimenez. 



Campostoma pricei Jordan & Thoburn, Bull. 47, U. S. Nat. Mus., 

 1896, 205; Rucker Canon, tributary of Rio Yaqui, Chiricahua 

 Mts., southern Arizona. 



Rivers of northern Mexico in the headwaters of the Atlantic and 

 Pacific coast streams, its southern range being the headwaters of the 

 Rio Nazas. (Santiago Papasquiaro.) 



. Head 3^ to 3^; depth 4 to 4>; D. 8; A. 8; scales 10-72 to 75-9. 

 Body rather stout, not much compressed; head rather large, the snout 

 projecting and somewhat acute; mouth small, the maxillary not 

 reaching to vertical from anterior margin of orbit ; length of snout 2 2 / z 

 in head; diameter of eye 4^ in head; origin of dorsal fin midway be- 

 tween base of caudal and anterior margin of eye; 35 to 40 scales in a 



