84 Annals of the Carnegie Museum. 



28 mm.; its width 23 mm.; depth of body 13 mm.; eye 4 mm.; 

 interorbital 12.5 mm.; ramus of lower jaw 3.1 mm.; first dorsal ray 

 25 mm.; last dorsal ray 13 mm.; distance between dorsal and spine 

 of the adipose fin 12 mm.; depth of caudal peduncle 9 mm.; length 

 of caudal peduncle from anal to base of the plates at root of caudal 

 20 mm.; outer ventral ray 21 mm.; pectoral spine 29 mm. 



Snout with a narrow naked margin, with eight small tentacles, only 

 the two median ones bifid; no tentacles on middle line of head; about 

 fourteen interopercular spines. Twenty-four scutes in the median 

 series, six between dorsal and adipose, eleven between anal and caudal; 

 pectoral extending to third fifth of ventrals, ventrals to tip of anal; 

 caudal obliquely truncate, length of upper ray 25 mm., length of 

 lower 30 mm. 



Black, tips of the fin-rays very narrowly light. 



The larger specimen from Raspadura (13651 I. U. M.) has six 

 tentacles. The two smaller specimens from Condoto and the smaller 

 one from Raspadura have each a small tentacle on the margin of the 

 snout near the angle of the mouth, none elsewhere; but tentacles are 

 indicated also along the anterior part of the margin of the snout in 

 one of the smaller specimens from Condoto. 



II. Hemiancistrus landoni sp. nov. 

 13654, I. U. M., type, 255 mm. over all. Naranjito, Ecuador. Henn. 



Head 3.14; depth 5.35; D.I, 7; A.I, 4. Length to plates at root 

 of caudal 198 mm.; length of head 63 mm.; width of head 60 mm.; 

 depth of body 37 mm.; eye 7 mm., interorbital 22 mm., snout 37 mm., 

 ramus of lower jaw 11 mm. Scales along the side 26 -|- i at root of 

 caudal; 7 between dorsal and adipose, 15 between anal and caudal 

 fulcrum, base of dorsal equal to its distance from the middle of the 

 spine of the adipose; length of caudal peduncle 68 mm. from anal to 

 base of plates at root of caudal. 



About ten large interopercular spines and numerous graduated 

 smaller ones, the longest of the larger spines about 2.66 in the head, 

 ventral surface entirely covered with small plates; supra-occipital 

 with a slight median elevation, bordered by a single plate; plates of 

 sides carinate, the ridges on the second row from the top strongest; 

 length of dorsal spine but little less than length of head. Pectoral 

 spine with strong hooks toward the tip, reaching second third of 

 ventrals; ventrals beyond base of anal. Caudal symmetric, very 



