106 Bulletin 47, United States National Museum. 



148. ACIPENSER RUBICUNDUS, Le Sueur. 



(LAKE STURGEON ; OHIO STURGEON ; STONE STURGEON ; ROCK STURGEON ; RED STURBEON.) 

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

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

 young, becoming quite blunt 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 

 moderate size, about | 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. 

 (rubicundus, reddish.) 

 Acipenser rubicundus, LE SUEUR, Trans. Amer. Phil. Soc., i, 1818, 388, Lakes Ontario, Erie, 



and all the upper Lakes. 



Acipenser maculoms, LE SUEUR, I. c., i, 393, 1818, (young), Ohio River. 

 Acipenser ruperiianus, RICHARDSON, Fauna Bor. Amer., in, 11, 1836, Albany River, Rupert 



Land. 



Acipenser Isevis, carbonarius, and rhynchseus, AGASSIZ, 267, 271, 276, 1850, Lake Superior. 

 Acipenser rubicundus and maculosus, GUNTHER, Cat., VIII, 338, 339, 1870. 

 Acipenser liopeltis, GUNTHER, Cat., vm, 341, 1870, Mississippi. 

 Acipenser rubicundus, MILNER, Rept. U. S. Fish Com., 1872, 1873, 67. 

 Acipenser rubicundus, JORDAN & GILBERT, Synopsis, 87, 1883. 



Acipenser serotinus, ohiensis, and macrostomus, RAFINESQUE, Icli. Oh., 80, 1820, Ohio River. 

 Dinectus truncaius, RAFINESQUE, Ich. Oh., 80, 81, 1820, (erroneous, on a drawing by Andubon). 

 Acipenser copei, ? upper Missouri ;rauchi, Osage River; ricJturdsoni, Missouri River;tt)ijnos, 

 Missouri "River; par anasimos, Huntsville, Ala.; anthr acinus, Lake Erie; lamarii, Missis- 

 sippi River; alelaspis, Saskatchewan River; rafinesquei, Ohio River; rosarium, upper 

 Mississippi, or Lake Erie; platyrldnus, upper Mississippi or Lake Erie; kirtlandi, 

 Lake Erie; nertinianus, Michigan; honneymani, no locality; Cincinnati, Ohio River; and 

 buffalo, Lake Erie; DUMERIL, Hist. Poiss., n, 108-231, 1870. 



149. ACIPENSER BREV1ROSTRTJM, Le Sueur. 



(SHORTNOSED 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 \ 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, snout.) 



Acipemerbrevirostrui^Ij-E SUEUR, Trans. Amer. Phil. Soc., I, 390, 1818; GUNTHER, Cat., vm, 841; 



JORDAN & GILBERT, Synopsis, 87, 1883. 



Acipenser oblusiroslris, LOVETZKY, Nouv. Mem. Soc. Nat., in, 257 (after Le Sueur). 

 Acipenser microrhynchus, New York; lemeuri, New York; dehtyi, New York; and rostettnm, 



probably New York; DUMERIL, Hist. Poiss., n, 164-173, 1870. 



