150 OSTARIOPHYSI. 
2. Campostoma anomalum. 
Campostoma anomalum (Rafin., 1820), Jord. & Everm. Bull. U.S. Nat. Mus. xivii. 1896, p. 205°; 
Meek, Publ. Columbian Mus., Zool. v. 1904, p. 42”. 
Campostoma formulosum, Girard, U.S. & Mex. Bound. Surv., Fish. p. 41, t. 25. figs. 5-8 (1859) *; 
Jord. & Everm. t. c. p. 206*; Meek, 1. ¢.’. 
Campostoma nasutum, Girard, t. c. p. 42, t. 25. figs. 9-12”. 
Closely allied to the preceding, but with much larger scales, 46 to 53 in a longitudinal series. 
Hab. Mississippi System and southwards to the Rio Grande; in Mexico recorded from 
the Rio San Juan in Nuevo Leon 2°. 
I have compared a specimen from Ohio with Girard’s figures. 
7. HYBOGNATHUS, Agass., 1855. 
Hybognathus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, pp. 211 and 242. 
Body elongate, more or less compressed. Mouth protractile, small, horizontal, terminal or subterminal; no 
barbels. Pharyngeal teeth compressed, scarcely or slightly hooked, with broad grinding-surface, in a 
single series, 4—4, Scales large. Lateral line complete. Dorsal fin short, about in the middle of the 
length of the fish ; anal short. Intestine elongate, with several convolutions. 
About eight species, small herbivorous fishes, chiefly of the Mississippi and Rio 
Grande Systems. 
1. Hybognathus episcopus. 
Dionda episcopa, Girard, Proc. Ac. Philad. 1856, p. 177". 
Dionda melanops, Girard, t. c. p. 178°, and U.S. & Mex. Bound. Surv., Fish. p. 44, t. 26. 
figs. 17-20 (1859) *. | 
Dionda couchi, Girard, |. c.', and t. ec. p. 44, t. 26. figs. 1-4’. 
Hybognathus punctifer, Garm. Bull. Mus. Comp. Zool. viii. 1881, p. 89°. 
Hybognathus civilis, Cope, Trans. Am. Phil. Soc. 1884, p. 167 ’. 
Hybognathus episcopus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 214°; Meek, Publ. 
Columbian Mus., Zool. v. 1904, p. 49°. 
Hybognathus melanops, Jord. & Everm. t. c. p. 216 ™. 
Notropis rasconis, Jord. & Snyd. Bull. U.S. Fish. Comm. xix. 1899, p. 121, fig. (1900) 
Hybognathus rasconis, Meek, t. c. p. 50, fig. 10. 
Depth of body 8 to 4 in the length, length of head 4 to 43. Snout as long as eye, the diameter of which 
is 8 to 33 in the length of head; interorbital width 23 to 2% in the length of head. Mouth small, 
subterminal. Dorsal 8-9, with 6 or 7 branched rays; origin nearly equidistant from tip of snout and 
base of caudal. Anal 8. Pectorals shorter than the head, not reaching the ventrals, which are inserted 
below or a little in advance of the origin of dorsal. 85 to 44 scales in a longitudinal series, 6 or 7 
in a transverse series from origin. of dorsal to lateral line, 4 or 5 between lateral line and base of ventral, 
Lateral line complete. Caudal peduncle nearly twice as long as deep. A more or less distinct dark 
lateral stripe ending in a caudal spot. 
Hab. Southern Texas and Northern Mexico: 
Camanche Spring, Rio Grande}, Brownsville, Texas!°; Rio Conchos in 
Chihuahua ® 1° (Meek); Buena Vista 2°, Parras®, and Saltillo® in Coahuila; Rio 
