Jordan and Evermann. Fishes of North America. 315 



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



ee. Barbels two. 



/. Back and sides sprinkled with dark dots. 



g. Lower lobe of caudal pale ; snout moderate. 



A. Eye small, 3% to 4 in head. JESTIVALIS, 521. 



hh. Eye rather large, 3% in head. HTOSTOMUS, 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. 

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



.;'. Scales 37. MONTAJJUS, 525. 



jj. Scales 45. CUMINOI, 526. 



dd. Scales small, about 56 in lateral line ; dorsal fin with a large 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 band, expanded at intervals into round dark blotches. 

 &. Scales in lateral line about 44 ; 17 before dorsal. DISSIMILIS, 528. 



i-A-. Scales in lateral line about 50 ; 20 before dorsal. WATAUGA, 529. 



HTBOPSIS : 



bb. 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. ' LABROSUS, 530. 



tt. Dorsal fin plain, without distinct markings. 



TO. Eye moderate, 3*4 to 3% 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. rrpsiNOTrs, 531. 



nn. Head larger and less conical; depth 5; scales 5-36-3. HUBRIFRONS, 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): 

 bbb. 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, 535. 

 NOCOMIS: 



aa. Species of large size, not silvery, 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 Semotilus. KENTUCKIENSIS, 536. 



Subgenus ERIMYSTAX, Jordan. 

 520. HYBOPSIS TETRANEMUS, Gilbert. 



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

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

 resembling H. cestivalis 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 cestivalis ; longest barbel as long as eye. Head very slender, 

 slenderer than in ctstivalis. Dorsal over ventrals, a little nearer tip of snout 

 than caudal. Fins large. Color as in cestivalis, 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 



