192 Bulletin 47, United States National Museum. 



Dorsal tin long, of 14 or 15 rays. Green above, white below ; lower fins 

 white. Yadkin River. (Cope.) (thalassinus, sea green.) 



Ptychostomus tkalassinus, COPE, Proc. Am. Phil. Soc. Phila., 1870, 472, Yadkin River, North 



Carolina. 

 Moxostoma thalassinus, JORDAN, Bull. U. S. Nat. Mus., xn, 131, 1878; JORDAN & GILBERT, Synopsis, 



139, 1883. 



312. MOXOSTOMA CONGESTUM, (Baird & Girard). 



(TEXAS BED HORSE.) 



Head 4 to 4f ; depth 4. D. 12. Scales 6-45-5. General form of M. 

 aureolum. rather robust, moderately compressed, the back somewhat ele- 

 vated. Head comparatively short, rather broad above and pointed anter- 

 iorly ; the snout a little projecting, mouth rather small, the lower lip full, 

 formed as in M. aureolum; eye small, about 5 in head; dorsal fin unusu- 

 ally low and small, little elevated in front, its first ray, when depressed, 

 reaching about to middle of last ray ; caudal not deeply forked, the lobes 

 equal; lower fins moderate. Smoky yellowish brown above, yellowish 

 silvery below ; lower fins whitish ; none of the fins red in life; the mem- 

 branes of the dorsal always dusky. Teeth as in M. aureolum. Streams of 

 Texas (our specimens from Lampasas River), said to have been taken in 

 Ash Creek, Arizona, but this is doubtful. The types of congestum and albi- 

 dum belong to this species, which is close to macrolepidotum. (congextuit, 

 swollen.) 



Catoslomus congesius, BAIRD & GIRARD, Proc. Ac. Nat. Sci. Phila., 1854, 27, Rio Salado, Texas. 



Ptychostomus albidus* GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 172, Rio San Juan, Mon- 

 terey, New Leon. (Type, No. 170.) 



Moxostoma albidum, JORDAN &GILBERT, Synopsis, 141, 1883; JORDAN, Proc. U. S. Nat. Mus., 1886,18. 



Catostomm lexanus, ABBOTT, Proc. Ac. Nat. Sci. Phila., 1860, 473, Colorado and New rivers, 

 Texas. 



313. MOXOSTOMA AUSTRINUM, Bean. 



Head 4; depth 4. D. 11; A. 6. Scales 6-44-6. Body rather stout; 

 lips plicate, truncate behind. Fontanelle very small. Eye small, nearly 6 in 

 head. Dorsal rather high, its margin concave, its first ray when depressed 

 nearly reaching end of last ray. Air bladder in 3 parts. Light brown 

 above, yellowish below, some scales brownish at base; paired fins with 

 dark blotches in the adult, these markings wanting in the young which is 

 nearly plain silvery. Basin of Rio de Santiago, Michoacan, Mexico (west 

 of Sierra Madre). Our specimen from Rio Lerma, at Salamanca, (aus- 

 (trinus, southern.) 



Myxostoma austrina, BEAN, Proc. U. S. Nat. Mus., 1879, 302, Piedad in Morelia, (Michoacan), 



Mexico. (Type, Nos. 23120 and 23121.) 

 Minytrema austrinum, JORDAN & GILBERT, Synopsis, 136, 1883. 



314. MOXOSTOMA AUREOLUM, (Le Sueur). 

 (COMMON RED HORSE; MULLET; WHITE SUCKER; LARGE-SCALED SUCKER.) 



Head comparatively elongate, bluntish, rather broad and flattened 

 above, 4 to 5 in length, its size somewhat variable. Body stoutish, vary- 



*The type specimen of Ptychostomus albidus has 44 scales in the lateral line, instead of 56, 

 as represented in Girard's figure. 



