FISHES OF XK\V YORK -"> :> >T 



pugnacious, and, when these fish are kept in confinement, great 

 morlalily is caused by iheir quarrels. The species is abundant 

 in small streams, where it secretes itself among aquatic plants 

 and is always alert to attack small fishes and insects. Speci- 

 mens have recently been obtained from an artesian well in 

 South Dakota, the well having a depth of TOO feet. From this 

 great depth the fish were brought up in full strength and vigor, 

 and they were kept in an aquarium several months afterward. 

 A similar occurrence has been recorded by Mrs Eigenmann, in 

 the Proccc<Hn</s of tlir National Museum for 1883, p. 21", of 

 Williamson's stickleback at San Bernardino Cal. The well in 

 this case was only 191 feet deep. There is no doubt that the 

 fish reach the wells through streams which become subter- 

 ranean in a certain part of their course. 



This species is a nest-builder and is vigorous in the defense 

 of its eggs and young. 



This fresh- water stickleback appears to live better in bal- 

 anced tanks than in flowing water and is not hardy in captivity. 

 It feeds readily on chopped hard clams and G a in m a r u s , the 

 latter being one of its natural foods. 



169 Eucalia inconstans cayuga Jordan 



Cayuga Lake Stickleback 



Eucalia inconstans cayuga JORDAN, Man. Vert. ed. 1, 249, 1876, Cayuua 

 Lake. Ithaca, N. Y.; MEEK, Ann. X. Y. Acad. Sci. IV, 312, 1888; 

 JORDAN & EVERMANN, Bull. 47, U. S. Nat. Mus. 744, 



According to Dr Jordan, this variety has longer ventral 

 spines than the common brook stickleback, these being as long 

 iis the pubic bones (two thirds as long in inconstans). 

 The size is generally smaller, but the fin rays are the same as 

 in incoustans. 



The variety occurs in small brooks and in the lakes about 

 Ithaca and S} T racuse N. Y. 



Genus PYGOSTEUS Brevoort 



This genus is characterized by the presence of 9 to 11 

 divergent spines and by the weakness of its innominate bones. 



