CATALOGUE OF VERTEBRATES. 679 



or mottled ; a black spot on opercle ; no black lateral bands ; 

 spring males with lips, cheeks and lower fins crimson. Dorsal 

 rays, 8 ; length, 5 inches. In clear and boisterous streams. 



" This less handsome species is not as abundant anywhere in 

 the State as the next, and is generally found associated with it." 



R. atronasus, Mitch. {Cfyprmus.) Black-nosed Dace. 



Barbel minute ; dusky silvery below, with a dark lateral band 

 from snout to tail fin ; in spring males this (or sometimes whole 

 body) crimson ; in summer orange. Dorsal rays, 7 ; lateral 

 lines, 64 ; length, 3 inches. 



" This is a very common species, found in all the spring-water 

 brooks of every county of the State. Its habits present nothing 

 peculiar." 



CBRATICHTHYS, Bd. 



(Nocomis. Hybopsis.) 



C. biguttatus, Kirt. {Semotilus, nebrascensis, cyclotis, atigmaticus.) 

 Horny-head. Horned Chub. Jerker, Eiver Chub. 



Barbel on maxillaries ; dorsal nearly over ventrals ; body 

 robust ; head large ; snout conical and blunt ; mouth large, lower 

 jaw the shorter ; eye small ; eighteen scales in front of dorsal ; 

 bluish above ; sides with coppery and green ; belly pale, not 

 silvery, rosy in spring males ; fins pale orange, without black 

 spot ; a crimson spot on side of head in spring males ; sort of 

 crest on head, covered with tubercles. Lengtlr, 6 to 9 inches. 

 The most widely diifused of Cyprinidce ; everywhere abundant 

 from Pennsylvania to Utah. Not quoted from the Atlantic 

 coast (?). 



SEMOTILUS, Raf. 



(Leucosomus. Chilonemus. Cyprinus.) 



S. corporalis, Mitch, {dorsalis, cephalus, atromaculatus, speciosus, &c.) 

 Common Chub. Horned Dace. 



Body robust ; head large ; upper jaw protractile ; a small 

 barbel on maxillary ; dorsal well back on tapering part of body ; 

 scales small and crowded anteriorly; a black spot on base of 

 dorsal ; eye small ; dusky blue above ; band on side in young ; 

 belly whitish (rosy in spring males) ; dark vertebral line ; dusky 

 bar back of opercle ; snout coarsely tuberculate in spring males. 

 Length, 10 inches. 



