Jordan and Evermann. Fishes of North America. 2695 



bb. Pectoral of right side only present. 



d. Dorsal rays 65 or 66; anal rays 48 to 51. 



e. Pectoral well developed, with about 6 rays; scales of eyed side with- 

 out hair-like filaments; scales of lateral line 77 to 80; chin little 

 prominent. KLUNZINGEEI, 3067. 



dd. Dorsal rays 50 to 58 ; anal rays 38 to 48. 



/. Pectoral fin of 4 to 6 rays, considerably longer than eye; body with 

 8 to 10 narrow, vertical dark bars, these sometimes obsolete with 

 age. 



g. Vertical fins all with round, dark spots, these usually especially 

 distinct on the caudal fin; some of the scales of eyed side 

 with black, hair-like appendages; pectoral fin with 5 or 6 

 rays, about 3 in head, its length equal to that from outer 

 edge of 1 eye to outer edge of another. Head 3 ; depth 1$. 

 Body with 8 narrow, vertical cross streaks. LINEATUS, 3068. 

 gg. Vertical fins dark, without distinct markings. Body broad, 

 ovate, the depth about 1^ in length ; pectoral fin with 4 rays ; 

 scales of right side with numerous black, hair-like ap- 

 pendages. D. 56; A. 42; scales 70. MAZATLANUS, 3069. 

 ff. Pectoral fins of 1 to 3 rays, about as long as eye. 



h. Body with 6 narrow, dark bands, these sometimes obsolete. 



Body rather narrowly ovate, its depth If in length. D. 



58 ; A. 44 ; scales 85. FONSECENSIS, 3070. 



hh. Body with about 10 black cross lines; depth Ig in length. D. 



61 ; A. 44 ; scales 60 ; pectoral of a single ray. 



FISCHEBI, 3071. 



hhh. Body with very numerous (20 to 40) black cross bands, which 



are as broad as the interspaces. 



j. Blind side of snout with few fringes. Depth 1 in 

 length. D. 55 ; A. 48 ; scales 80. Body covered by 

 many blackish, wavy bands; caudal with black 

 spots. SCUTUM, 3072. 



ACHIRUS : 

 aa. Pectoral fins wholly wanting. 



Jc. Dorsal rays 46; anal rays 33; right lower lip with serrated fringes; nostril in 



a fringed tube ; depth 1 in length ; head 3. Color brown, head and body 



with numerous large, rounded or kidney-shaped white spots, edged with 



dark brown ; scales 70. . FIMBEIATUS, 3073. 



jfcjfc. Dorsal rays 50 to 55; anal rays 37 to 46; right lower lip fringed; left nostril 



with some fringes ; depth Ig in length ; head 4 ; none of the scales of eyed 



side with hair-like appendages. Color dusky olive, more or less mottled 



with about 8 dark vertical stripes, these varying very much in width and 



number; caudal spotted. FASCIATUS, 3074. 



kkk. Dorsal rays 59 or 60; anal rays 41 to 45; snout and chin without evident 



fringe or barbel; right lower lip fringed; head 4 in length; depth 1|; 



scales 64. Body with 12 black cross bands with narrower ones between ; 



caudal spotted. PANABJENSIS, 3075. 



Subgenus BAIOSTOMA, Bean. 

 3065. ACHIRUS ACHIRUS (Linna3us). 



D. 60 to 67; A. 48; P. right 3, left 1; scales 80. Pectorals rudimentary 

 on both sides; right ventral fin composed of 5 rays, which are continuous 

 with the anal. Scales on the nape and on chin twice as large as those on 

 body ; snout with a few fringes on blind side ; right lower lip fringed. 

 Height of body If in total length (without caudal) ; width of interorbital 

 space nearly equal to, or rather more than diameter of eye ; upper eye 



