168 FISHES OF WESTERN SOUTH AMERICA 
Head 3.5; depth 5.33-6.0; D. I, 6; A. I, 5 or I, 6. 
Adipose fin high, arched, beginning at the tip of the depressed dorsal spine or 
farther forward, terminating at root of caudal in a minute spine, much more rarely 
continued without notch to the caudal. 
Maxillary barbel ending about midway between posterior margin of lip and 
gill opening; teeth of anterior premaxillary series rather large, pointed or truncate, 
the median pair usually bicuspid; nasal flap pointed, not produced in a barblet; 
interorbital less than the distance between the eyes and the posterior nares; width 
of head very little less than its length; distance between snout and dorsal 2.25—-2.4 
in the length; dorsal spine prolonged, equal to head less space in front of anterior 
nares, the length of the rays diminishing from the first backward; adipose spine 
fleshy, bearing a few spinules, its tip usually continuous with the margin of the 
adipose ridge, a distinct notch behind it, a small membrane attaching the spine 
to the back, the spine rarely absent, the ridge with or without a posterior notch; 
caudal deeply emarginate, the lobes as long as the head or considerably longer; 
anal in male with second ray slightly shorter than those in front of or behind 
it; anal in female with the spine longest, the rays graduated; origin of the ventrals 
under or in front of the origin of the dorsal, reaching about three-fourths to the 
anus, about equal to the length of the head behind the nares; pectoral filament 
about as long as the head, reaching a little beyond the middle of the ventrals. 
Color variable, rarely uniform dark brown, without spots on the fins, some- 
times with a variable, light margin along posterior half of adipose ridge and a 
variable light band downward from the adipose spine. In addition there is a 
series of individuals with regular modifications from the smallest to the largest: 
in the smallest are three large, light areas, one in front of the dorsal, one behind it, 
and one across posterior portion of adipose, with a dark band across the caudal; 
these light areas become marbled and gradually fade with age, and the caudal 
becomes spotted. 
138. ASTROBLEPUS UBIDIATI (Pellegrin) 
Cyclopium ubidiai Pellegrin, 1931, Rev. Suisse Zool., XX XVITT, 113-115, fig. 1. 
Ecuadorean highlands 
139. ASTROBLEPUS LONGICEPS Pearson 
Astroblepus longiceps Pearson, 1924, Ind. Univ. Studies, XI, no. 64, 15, pl. ui, fig. 5, Rio Colorado, 
lower Bopi, Bolivia. 
Eastern slopes of Peru and Bolivia 
15069 and 17584, many, 20-58 mm. without caudal, Rio Yanahuana, Murdock, December, 1918. 
A species near A. prenadilla, more attenuated, although the width of the 
head in the length is the same as in A. sabalo; no indication of marbling in our 
specimens. Appears to be confined to the Atlantic drainage. 
