Jordan and Evermann. — Fishes of North America. 315 



e. Barbels four ; body sprinkled with black dots. tetranemus, 520. 



«e. Barbels two. 



/. Back aiul sides sprinkled with dark dots. 



g. Lower lolie of caudal pale ; snout moderate. 



h. E}-e small, 3J-.;J to 4 in head. ;i;stivalis, 521. 



lih. Eye rather largo, Z% in head. hyostomus, 522. 



gg. Lower lobe of caudal black in life; color of back darker; snout 



very long. gelidus, 523. 



ff. Back and sides pale, not dusted with dark dots. 



i. Lower lobe of caudal black in life ; eye small, 4^/^ in head. 



MEEKI, 524. 

 ii. Caudal fin with both lobes pale ; eye larger, 3% in head. 



j. Scales 37. montanus, 525. 



jj. Scales 4.5. cimingi, 526. 



Ad. Scales small, about 50 in lateral line ; dorsal tin with a largo black blotch 

 on its posterior rays ; a dark spot at base of caudal. monacus, 527. 



cc. Teeth with a slight grinding surface ; eye very large, about 2% in head ; sides 

 with a dark lateral baud, expanded at intervals into round dark blotches, 

 t. Scales in lateral line about 44 ; 17 before dorsal. dissimilis, 528. 



'kU. Scales in lateral line about 50 ; 20 before dorsal. watauga, 529. 



HYl!0P.<itS : 

 66. Teeth two-rowed, 1, 4-4, 1 or 0, without grinding surface ; mouth small, below the 

 blunt snout ; scales large, 34 to 42 in lateral line. Silvery species, with conspic- 

 uous preorbital. Aspect of Notropis. 



I. Dorsal fin in adult with a large dark blotch on its last rays above ; lips thick, the 



barbel very long ; eye 3% in head. i.abrosus, 530. 



II. Dorsal fin plain, without distinct markings. 



m. Eye moderate, 3'4 to S^^ in head ; fins with red in spring males ; sides with 

 a dark band ending in a caudal spot. 

 n. Head small, conical ; depth 4 ; scales 5-40-3. itpsinotus, 531. 



mi. Head larger and less conical; depth 5; scales 5-3G-3. rubrifrons, 532. 

 mm. Eye large, 2^^ to 3 in head. 



o. Sides with a dusky shade; size small, length 2 to 3 inches, amblops, 533. 



oo. Sides bright silvery ; silvery preorbital broad and conspicuous ; size large, 



4 to 10 inches or more in adult. storerianus, 534. 



Yuriria, (from Lake Yuriria, Guanajuato, where the typical species abounds): 



666. Teeth one-rowed, 4-4, with broad grinding surface and slight hook ; mouth rather 



large, terminal ; scales moderate, about 45 ; 18 before dorsal. Silvery species, 



with conspicuous preorbital and very small barbel; size very large, altus, 536. 



NocoMis: 



aa. Species of large size, notsilverj', with the mouth large, nearly terminal, the dorsal inserted 



slightly behind ventrals ; the teeth 4-4, or 1, 4-4, 1. Eye small ; scales in lateral 



line about 41. Aspect of Semoliliis. kentuckiensis, 536. 



Subgenus ERIMYSTAX, Jordan. 



520. HTBOPSIS TETRANEMUS, Gilbert. 



Head 4 ; depth 5i ; snout 2i in head, i of it projecting beyond moath ; 

 eye small, 5 in head. D. 8; A. 8; lateral line 36 to 38; teeth 4-4. Closely 

 resembling H. (vstivalis but -with two long barbels at each angle of the 

 mouth, the one pair taking the place of the fleshy prominence seen in 

 gelidus and (rsflvalis; longest barbel as long as eye. Head very slender, 

 slenderer than in astivaUs. Dorsal overventrals,a little nearer tip of snout 

 than caudal. Fins large. Color aa in wstivalis, translucent silvery, with 

 irregular, scattered black dots above ; median rays of each caudal lobe 

 dusky at base. Length 2 inches. Tributaries of Arkansas River in Kansas 



