106 Bulletin 4J, United States National Museum. 



148. ACIPENSER RUBICUNDPS, Le Sueur. 

 (Lake STUU(iEON ; Ohio Sturqeon ; Stone Sturgeon ; Rook Sturgeon ; Red Sturgeon.) 



Dark olive above, sides paler or reddish, often with irregular blackish 

 spots. Body comparatively elongate; snout slender and loug in the 

 young, becoming quite Itlunt with age, when it is considerably shorter 

 than the rest of the head; shields large, rough, with strongly hooked 

 spines, becoming later comparatively smooth, the old examples almost 

 smooth. Skin with minute rough spinules in many series; ventral shields 

 growing smaller with age, and finally deciduous; last dorsal shield of 

 modeiate size, about A length of next the last. Anal f length of dorsal, 

 beginning near its middle. Dorsal shields 15 (11 to 16) ; lateral shields 38 

 (30 to 39); ventral plates 10 (8 to 11). D. 35; A. 26. L. 6 feet. Weight 

 50 to 100 pounds. Mississippi Valley, Great Lakes, and northward; the 

 common fresh-water sturgeon of the lakes and streams of the middle 

 west, usually not descending to the sea. The small rough "Rock Stur- 

 geon," A. maculosus, Le Sueur, we regard as the young of this species. 

 {ruhicundus, reddish.) 



Acipenser rnhimndns, Le Sueur, Trans. Amer. Phil. See, i, 1818, 388, Lakes Ontario, Erie, 

 and all the upper Lakes. 



Acipenser maciilostix, Le Sueur, I. c, i, 393, 1818, (young), Ohio River. 



Acipenser riiperliamis, Richardson, Fauna Bor. Amer., iii, 11, 183G, Albany River, Rupert 

 Land. 



Acipenser hevis, carbonariiis, and rhynchieiis, Agassiz, 267, 271, 270, 1850, Lake Superior. 



Acipenser ruhicundus a,nd iiiacitlosns, Gunther, Cat., vili, 338, 339, 1870. 



Acipenser liopellU, Gunther, Cat., viii, 341, 1870, Mississippi. 



Acipenser nihicundns, Milner, Rept. U. S. Fish Com., 1872, 1873, C7. 



Acipenserndyicundus, Jordan & Gilrebt, Synop.sis, 87, 1883. 



Acipenser serotinus, ohiensis, and macrostomus, Rafinesque, Ich. Oh., 80, 1820, Ohio River. 



Dinectus truncaliis, Rafinesque, Ich. Oh., 80, 81,1820, (orronoous, on a drawing by An<lubon). 



Acipetiser capei, ? upper Missouri; rom'/d', Osage Kiver; ricliardsoni, Missouri River; ((Hcwtmos, 

 Missouri River; paranasinios, Huntsville, Ala. ; anthrncinns, Lake Erie; hiiitioii, Missis- 

 sippi River; alelaiipis, Saskatchewan River; ralines<piei, Ohio River; rn.virium, upper 

 Mississippi, or Lake Erie; pluO/rldnus, upper Mississippi nr Lake Erie; hirllKiidi, 

 Lake KTie;nerliniamis, Michigan; lionnei/nimii, no locality ; t()((i)i)«(/i, Ohio River; and 

 buffalo. Lake Erie; Dum^ril, Hist. Poiss., ii, 108-231, 1870. 



149. ACIPENSER BREVIROSTRUM, Le Sueur. 



(Shortncsed Sturgeon.) 



Dusky above, paler below. Snout very short and obtuse, about i of 

 the length of the head. Barbels short, simple. Skin between rows of 

 shields with many rows of small prickle-like plates; last dorsal shield 

 very small, less than A the one before it. Shields rather large and 

 smoothish. Anal about half dorsal and entirely below it. Dorsal shield 

 11 (8 to 11); lateral 32 (22 to 33); ventral 9 (6 to 9); D. 41 ; A. 22. Cape Cod 

 to Florida, rare northward, extending further southward than other 

 species; our specimen from Charleston, (brevis, short; rostrum, snont.) 



Acipenser hreviroslrmn,'Lv^ SvEvn, Trans. Amer. Phil. Soc, l, 390, 1818; Gunther, Cat., vni, 841; 



.loRDAN & Gilrert, Syiiopsis, 87, 1883. 

 Acipetiser iiUusiroalria, LovETZKY, Nonv. Mem. Soc. Nat., in, 257 (after Le Sueur). 

 Acipenser niicrdrhijrichus. New York; h'sururi, New York; dcbuii. New York; and ivw/</;iiw, 



probably New York; DuMiiRii., HiHt. Poiss., ii, 104-173, 1870. 



