198 CONTRIBUTIONS TO NORTH AMERICAN ICnTIIYOLOGY III. 



name hison od bis autboiity. This species is not geuerally common in 

 so far as ray experience goes. I have, however, seen one or two from 

 the Ohio Kiver. I found no specimens in the National Museum. 



47. CAKPIODES THOMPSONI Agassiz. 



Lake Carp. 



1842 — Catostomus cyprinus Thojipsox, Hist. Vt. 133. 



1855 — Carpiodes ihompsoni Agassiz, Am. Jouru. Sc. Arts, 2d series, six, 191. 



Carpiodes thompsoni Cope, Proc. Ao. Nat. Sc. Phila. 285, 18G4. 



Carpiodes tlwmpsonii Cope, Proc. Am. Philos. Sac. Phila. 483, 1870. 



Carpiodes ihompsoni Jordan, Man. Vert. 297, 1876. 



Ichthyobus thompsoni Nelson, Bull. No. 1, Ills. Mus, Nat. Hist. 49, 1876. 



Carpiodes ihompsoni Jordan & Copeland, Check List, 158, 1876. 



Carpiodes ihompsonii Jordan & Gilbert, iu Klippart's Rept. 53, 1876. 



Carpiodes ihompsoni Jordan, Man. Vert. ed. 2d, 322, 1878. 



Habitat. — Great Lake region ; abundant. 



This species occurs in more or less abundance throughout the Great 

 Lake region. It is the shortest and most arched of all the species. Its 

 dorsal fin is about intermediate between that of velifer and that of 

 carpio. I have examined very mauy speciuieus of this species, and I 

 find little variation among them. This fish reaches a length of some- 

 thing over a foot, and is sold by the Lake fishermen as " Carp ". 



Specimens in United Stales National Museum. 



48. CARPIODES CYPRINUS {Le Sueur) Agassiz. 



Eastern Carp Suclcer. Nthraslca Carp Suclcer. Bio Grande Carp. 



1817 — Catostomus cyprinus Le Sueur, Journ. Ac. Nat. Sc. Phila. i, 91. 



La1)co cyprinus DeKav, New York Fauna, part iv. Fishes, 194, 1842. 

 Sclerognathus cyprinus Cuvier & Valenciennes, Hist. Nat. des Poissous, xvii, 



474, 1844. 

 Sclerognathus cyprinus Storer, Synopsis, 427, 1846. 

 Carpiodes cyprinus Agassiz, Am. Journ. Sc. Arts, 2d series, xix, 191, 1855. 



