158 U.S. NATIONAL MUSEUM BULLETIN 2 82 



maculate; maxillary barbels lightly dusted with brown pigment; 

 nasal barbels dark brown; a patch, large as pupil, of brown chromato- 

 phores on abdomen just anterior to each pelvic fin and sometimes a 

 narrow gray area just behind the isthmus; otherwise abdomen and 

 lower head immaculate; lower surface adjacent to anterior one-fourth 

 of anal fin, forward to pelvic fins yellowish, mostly immaculate, or 

 with a narrow cross-band of dark brown pigment just behind vent; 

 dorsal fin white or translucent, with a few. scattered, brownish chro- 

 matophores distally on rays; dorsal spine and base of dorsal fin dark 

 grayish brown ; top of head dark grayish brown ; upper lip pale yellow- 

 ish; a dark band extends forward from beneath the eye to below the 

 anterior naris; lower cheek yellowish; large, scattered, brown chro- 

 matophores on cheek and lower half of operculum; a dark band of 

 pigment crosses back of head and extends downward to the brachi- 

 ostegal membrane and operculum; area over air bladder dark gray; 

 upper side of body nearly uniformly dark grayish brown; lower side 

 more variegated with grayish brown and yellowish white; a light tan 

 area extends backward, dorsaUy, from head nearly to the dorsal fin ; 

 a narrow dark grayish brown blotch surrounds the dorsal fin base; 

 two other narrow dark saddles, also with their greatest dimensions 

 lengthwise of the body, lie between the dorsal and adipose fins and at 

 the base of the adipose fin. A rounded light yellowish area, size of eye, 

 occupies the upper anterior procurrent caudal rays, and the caudal 

 peduncle beneath the rear part of the adipose fin and the procurrent 

 rays ; another of similar size is centered above the base of the posterior 

 anal ray. 



The following is an extract of color notes, provided by Dr. Traut- 

 man, from specimens 23 to 30 mm. long, collected September 26 to 

 October 9, 1957. Eye blue-black, pupil with a walleye cast; top of 

 head dusky olive, occipital region darkest; cheeks lighter, heavily 

 speckled with large melanophores ; lower surface of head and upper 

 lip milky white, unspotted; the four upper barbels pale, with a line of 

 melanophores along their posterior edges; lower barbels without 

 chromatophores ; dorsal half of body heavily speckled, dusky olive; 

 sides lighter, more blotched; belly, from vent forward, white except 

 chromatophores at bases of pelvic fins; a band of chromatophores 

 extends from the vent to the anal fin and, as a line, along each side 

 almost to that fin's posterior end; dark saddles at occiput, dorsal fin 

 base, between dorsal and adipose fins, and beneath center of adipose 

 fin; caudal fin with about three dusky crescentic bands; dorsal and 

 anal fins transparent. 



Type.— The holotype (pi. 13, fig. 1), UMMZ 187098, is a male, 

 44,1 mm. in standard length. It has 5+11 = 16 anal rays, 18+8+10 

 + 14=50 caudal rays, 33 vertebrae, and 6 soft dorsal rays. Paired 



