FISHES OF NEW YORK 107 



Dr Evermann collected two specimens in Black creek, tribu- 

 tary of Oswego river, al^Scriba Corners N. Y. July 17, 1894. Dr 

 Meek found it very common about Cayuga and Montezuma N. Y., 

 but did not observe it near Ithaca. In the market of New York, 

 according to De Kay, the chub sucker makes its appearance in 

 October, November and December. Specimens were seined in 

 Bronx river in August 1897. 



A young example sent from near Princeton N. J. by Prof. 

 XJlric Dahlgren in September 1897 showed the following volun- 

 tary change of color. When it arrived, it had the broad, longi- 

 tudinal, median band well deA'eloped and the vertical bands 

 obsolete; but soon after it was placed in a tank.it obscured the 

 longitudinal band entirely and developed the vertical bands. 



The food of the chub sucker consists chiefly of minute crusta- 

 'Ceans. insect larvae and aquatic plants. 



Genus mixytrema Jordan 



Body rather elongate, subterete, becoming deep and rather 

 ■compressed with age; scales rather large and nearly uniform 

 in size; lateral line interrupted in the adult, but with perfect 

 tubes, imperfect in parti}' grown individuals, and obsolete in the 

 young; head moderate, rather broad above; mouth moderate, 

 inferior, horizontal; the upper lip well developed, freely protrac- 

 tile; the lower rather small, infolded, inversely V-shaped in 

 outline, lower jaw without cartilaginous sheath; eye moderate, 

 rather high, nearly median; suborbital bones well developed; 

 opercular bones well developed, not very rough; fontanel 

 rather large; gill rakers rather long; isthmus moderate; pharyn- 

 geal bones essentially as in M o x o s t o m a; dorsal fin rather 

 short and high, inserted somewhat nearer to tip of snout than to 

 base of caudal; pectoral fins moderate, placed low; anal high 

 and short; ventrals short, midway between tip of snout and base 

 of caudal; caudal fin moderately forked, the lobes equal; air 

 bladder with two chambers. Head in males tuberculate in 

 «pring. 



