44 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — II. 



two, three, four, or five species, or how those species may be dis- 

 tinguished from each other, or, finally, what names any of them should 

 bear. Having lately been enabled to examine a large number of speci- 

 mens in a fresh state, through the kindness of John C. Klippart, the 

 efficient fish commissioner of the State of Ohio, I have come to certain 

 provisional conclusi ons, which I have thought it advisable to insert here. 



Among the species of Stisostethium, there are two well-marked groups, 

 known to our lake fishermen respectively as the "Saugers" and the 

 "Pikes". These differ somewhat in external peculiarities of form and 

 coloration, and strongly in the arrangement of the pyloric cceca. 



In the " Pike " group, there are three pyloric cceca, long and large^ 

 subequal, and all longer than the stomach. In the " Saugers ", the 

 pyloric cceca are much shorter and smaller. There are four larger than 

 the rest, not quite equal, and all shorter than the stomach. Besides the 

 four larger ones, there are one, two, or three small ones. The total 

 number is usually six, but sometimes the small ones are obsolete. 



In the extreme generic subdivision which at present obtains, any such 

 decided anatomical peculiarity may be held to indicate generic dis- 

 tinction. I therefore propose to consider the "Saugers" as at least 

 subgenerically distinct from the "Pikes". 



The name IStizostedion was proposed by Rafinesque for his Perca sal- 

 monea, the "White Salmon of the Ohio". Eafinesque's description is 

 not altogether satisfactory; but, as a certain fish of this genus is still 

 known as the " White Salmon," at the Falls of the Ohio, it is possible 

 to make an undoubted identification. The Perea salmonea is a " Pike", 

 and therefore the name Stizostedion (or rather Stizostethium, for the name 

 is stated to mean " pungent throat") should be retained for the Pikes. 



Since the preceding paragraphs were in type. Prof. Gill and the 

 writer have been enabled to compare the American species of iStizo- 

 stetJdum with the two inhabiting the waters of Europe, viz, Stizoste- 

 thium lucioperca (L.) G. & J. {Lucioperca sandra 0. & V.) and Stizostethium 

 volgense (Pallas) G, & J. The genus divides at once into four strongly 

 marked sections or subgenera, of which two — that typified by S. cana- 

 dense and that by S. volgense — bear little resemblance to each other, 

 and could be readily considered as generically distinct were not the 

 other two sections intermediate. (1) The section typified by S. volgense 

 in several respects approaches the genus Perca: it may be termed 

 Mimoperca{G.&J.). (2) The Sanger group, from the development of the 

 canine teeth, may be appropriately designated as Cyno^erca (G. & J.). 



