FISHES — CATOSTOMIDiE. 



opercular bones muiloratoly developed, nearly smooth; Istlimus broad; gill-rakera 

 feeble ; pliaryDgeal bones rather weak, the teeth moderate, strongly compressd, the 

 lower five or six maoh stronger than the others which diminish rapidly in size upward, 

 each with a prominent internal cusp ; scales large, quadrate, nearly equal over the body 

 and not crowded anteriorly, usually about 41 in the lateral line, and about 12 series 

 between dorsal and ventrals ; lateral line well developed, straight or anteriorly curved ; 

 fins well developed, the dorsal inserted about midway of the b idy, its first rays usually 

 nearer snout than caudal, the number of rays usually 13 (11 to 17) ; anal fin short and 

 high, emarginate in old males, with seven rays ; ventrals inserted under middle of dor- 

 sal, usually with nine rays; caudal fin deeply forked; air-bladder with three chambera ; 

 skeleton essentially as in Catostomus, the vertebrae (in if. eorpio) "^7-14 ; sexual pecu- 

 liarities little marked, the males in the spawing season (March to June) with the lower 

 fins reddened, and the anal rays swollen and tuberculate 



Species numerous and very closely related, abounding in all waters of the United 

 States, east of the Rocky Mountains. 



ANALYSIS OF SPECIBS OF MTXOSTOMA. 



"Lower lip infolded, j\^-sliaped when viewed from below, with a distinct median 

 crease, in which the two halves of the lip meet forming an acute angle ; mouth 



small ; dorsal rays 16. vklatum. 43. 



* 'Lower lip full, its posterior edge truncate, not infolded or ^-shaped. 

 a. Dorsal rays I'i to 14. 

 6. Caudal fin with the upper lobe falcate, much longer than the lower. 



ANISURA. 44. 

 66. Caudal fiu symmetrical. 

 0. Mouth very small ; head short, 5 to 5J in length. . . . aureolum. 45. 

 CO. Mouth rather large ; head larger, 4 to 5 in length. 



MACROLEPIDOTUM, 46. 



aa. Dorsal rays 15 to 18 ; mouth large carpio. 47. 



43. Myxostoma velatum (Cope) Jordan. 



Smali-moutli Red Horse ; White Nose. 



Caioslomits aniaurus, Kibtland, Boston Journ. Nat. Hist., v, 1845, 269 (with plate). (Not 



of Raflnesqne.) — Stoker, Synopsis, 1846, 424. 

 Ptyohostomus-anisurus, Jordan, Buil. Buffalo Soo. Nat. Hist., 1876, 94 (name only). 

 Moxostoma anisurua, Jordan, Man. Vert., 1876, 295. 

 Teretulua animrua, Nelson, Bull. No. 1, Ills. Mus. Nat. Hist., 1676, 49. — Jordan and 



CoPBLAND, Check List, 1876, 15'^ (name only). 

 Moxostoma aniaiirum, Jordan, Proc. Acad. Nat. Sci. Phila., 1877, 72, 80. 

 Moxoaloma aniaura, Jordan and Gilbkrt, in Klippart's Eept., 1877, 53 (name only). 

 Myxostoma aniaura, Jordan, Bull. U. S. Nat. Mus., x, 1877, a3. 

 Ptychostomua vdaiua, Cope, Proc. Am. Philos.Soc, 1870, 471. 

 Moxostoma velatum. Jordan, Man. Vert., 1876, 296. 

 Teretulua velatum, Nelson, Bull. No. 1, Ills. Mns. Nat. Hist., 1876, 49. 

 Teretulus velaiua, Jordan and Copeland, Check List, 1876, 158. 

 Moxoatoma velata, Jordan and Gilbert, in Klippart's Kept., 1676, 53 (name only). 



