150 OSTARIOPHTSI. 



2. Campostoma anomalum. 



Campostuma anomalum (Tlafin., 1820), Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 189G, p. 205'; 



Meek, Publ. Columbian Mus., Zool. v. 190-1., p. 42 ^ 

 Campostoma formulosum, Girard, U.S. & Mcx. Bound. Surv., Fish. p. 41, t. 25. figs. 5-8 (1859) ' ; 



Joi-d. & Everm. t. c. p. 20G ' ; Meek, 1. c.\ 

 Campostoma nasutum, Girard, t. c. p. 42, t. 25. figs. 9-12°. 



Closely allied to the preceding, but with much larger scales, 40 to 53 in a longitudinal series. 

 Ilah. Mississippi System and southwards to the Eio Grande ; in Mexico recorded from 

 the Rio San Juan in Nuevo Leon ^ ■■'. 



I have compared a specimen from Ohio with Girard's figures. 



7. HYBOGNATHUS, Agass., 1855. 



Hyhognuthus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, pp. 211 and 242. 



Bod}- elongate, more or less compressed. Mouth protractile, small, horizontal, terminal or subterminal ; no 

 barbels. Pharyngeal teeth comjiressed, scarcely or sliglitly hooked, with broad grinding-surface, in a 

 single scries, 4 — 4. Scales large. Lateral line complete. Dorsal tin short, about in the middle of the 

 length of the fish ; anal short. Intestine elongate, with several convolutions. 



About eight species, small herbivorous fislies, chiefly of the Mississippi and Rio 

 Grande Systems. 



1. Hybognathus episcopus. 



Dionda epnscopa, Girard, Proc. Ac. Philad. 185G, 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 coudii, Girard, 1. c.', and t. c. p. 44, t. 26. figs. 1-4. '. 

 HyhognaUius pundifer , Garm. Bull. Mus. Comp. Zool. viii. 1881, p. 89°. 

 Hybognatlius 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'. 

 Hyboynatlius melanops, Jord. & Everm. t. c. p. 216 ". 



Notropis rasconis, Jord. & Snyd. Bull. U.S. Fish. Coram, xix. 1899, p. 121, fig. (1900) ". 

 Hybognathus rasconis, Meek, t. c. p. 50, fig. 10 ''\ 



Depth of body 3 to 4 in the length, length of head 4 to 4J. Snout as long as eye, the diameter of which 

 is 3 to 3i in the length of head ; iuterorbital width 24 to 2g in the length of head. Mouth small, 

 subterminal. Dorsal .S-!J, with G or 7 branched rays ; origin nearly equidistant from tip of snout and 

 base of caudal. Anal 8. rectorals shorter than the head, not reaching the ventrals, which arc inserted 

 below or a little in advance of the origin of dorsal. 35 to 44 scales in a longitudinal scries, 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 enduig in a caudal spot. 



llalj. Southern Texas and Northern Mexico : 



Camanche Spring, Rio Grande i, Brownsville, Texas lo ; Eio Conches in 

 Chihuahua 9 10 (j/e^./;j . Buena Vista ^ 3^ Parras^ and Saltillo^ in Coahuila; Rio 



