NORTHWESTERN SOUTH AMERICA. 



675 



Head 3.5 ; depth 5. Adipose fin consisting of a fleshy spine and 

 an insignificant membrane. Dorsal and pectoral spines produced, 

 if at all, by not over a millimeter beyond the rest of the rays ; both 

 lips very broad ; outer teeth of the premaxillary of the adults chisel- 

 shaped, broad tipped, the middle pair or two middle pairs sometimes 

 bifid, about seven teeth on each premaxillary ; teeth in the young 

 much more slender; maxillary barbel usually not extending beyond 

 the posterior margin of the lip, sometimes falling considerably short 

 of that point, extending beyond the margin only in some of the 

 largest specimens from Perdizes and Fosco ; nasal flap short, not 

 continued as a barbel; pectorals reaching a little beyond origin of 

 ventrals ; pectoral spine equal to the length of the head less the por- 

 tion in front of the nares ; ventrals inserted under the origin of the 

 dorsal, extending little if any more than half way to the anal ; anus 

 usualh- about half way between tips of ventrals and origin of the 

 anal, very rarely reached by the ventrals ; dorsal spine a little shorter 

 than pectoral spine, the rays graduate or coterminal ; interocular 

 space less than the distance from the eyes to the posterior nares, 

 4-5 in the length of the head; distance between tip of snout and 

 dorsal 2.25-2.5 in the length; anal membranes in the male uniform, 

 or the first two membranes a little wider ; a light spot covering adi- 

 pose spine and its membrane, sometimes a light bar at this point as 

 in unifasciatus; body uniform dark or obscurely spotted; base of 

 caudal and a distal bar or some distal spots dark, sometimes uni- 

 form ; dorsal and pectoral sometimes with dark markings. 



2. Astroblepus cyclopus santanderensis var. nov 

 Specimens Examined. 



