192 Bulletin ^7, United States National Museum. 



Dorsal tiu Ions, of 14 or 15 rays. Greeu above, white below : lower tins 



white. A'adkin River. (Cope.) (//mZassinits, sea green.) 



P<yt7ios/«mi(s M(((«.ssmi(j, Cope, Proc. Am. Phil. Soc. Phila., 1870, 472, Yadkin River, North 



Carolina. 

 MuxustoiHii llialassiwts, Jordan', Bull. U. S. Nat. Mu8., xn, l:il, 1878; Jordan & Gilbert, Synopsis, 



lao, 18«3. 



•.iV2. MOXOSTOMA COXGESTUM, (Baird ct Girard). 



(Te.xas Red Horse.) 



Head U to 4| ; depth 4. D. 12. Scales 6-45-5. General form of AI. 

 aurcoluin, 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 il. aureolum ; eye small, about 5 in head; dorsal tin 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 coiujeiitum and aJhi- 

 dum belong to this species, which is close to macrolejndotuin, {cougeatun, 

 swollen.) 



Oilostonnts congeslm:, Baird & GiRARn, Proc. Ac. Nat. Sci. Phila., 1854, 27, Rio Salado, Texas. 

 I'li/chofldrmis tiWidus,'^ Girard, Proc. Ac. Nat. Sci. Phila., 18D6, 172, Rio San Juan, Mon- 

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

 Moxostoniaalbidum, Jordan jt Gilbert, Synopsis, 141,1883; Jordan, Proc. U.S. Nat. Miis., 188G,18. 

 Gatostomm cejcanus, Abbott, Proc. Ac. Nat. Sci. Phila., 1860, 473, Colorado and New rivers, 

 Texas. 



313. MOXOSTOMA AUSTKINUM, 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 6in 

 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; jiaired fins with 

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

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

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

 {trinuii, southern.) 



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



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

 Minytrema austriHitm, Jordan & Gilbert, Synopsis, 136,1883. 



314. MOXOSTOMA AUREOLUM, (Le Sueur). 

 (Common Ked 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 typo specimen of Ptychostomus albidua has 44 scales in the lateral line, instead of 50, 

 as represented in Girard's figure. 



