24 
Indiana University Studies 
caudal ; the first dorsal ray about 5 7 the length of the head, 
the last ray when depressed separated from the adipose by 
1 or 2 scutes; the length of the base of the dorsal is equal to 
the distance between the last ray of the dorsal and 1/3 of the 
adipose spine; pectoral spine extending to the base of the 
ventrals; the caudal obliquely truncate; the caudal peduncle 
21/2 times as long as deep. 
Olivaceous, sides with an indistinct median line ; fins dusky 
without spots. 
Ancistrus cirrhosa (C. & V.). 
17003, 19, 45-98 mm., Huachi. Aug., 1921. 
Ancistrus hoplogenys (Gunther). 
17001, 5, 42-118 mm., Lake Rogoagua. Nov., 1921. 
Ancistrus montana Regan. 
17004, 48, 32-92 mm., Rio Colorado, Popoi River, Huachi. Sept., 1921. 
17005, 1, 52 mm., Rurrenabaque. Nov., 1921. 
17006, 4, 56-58 mm., Tumupasa. Dec., 1921. 
No. 17006 was collected at the same place from which the 
types were taken. 
Ancistrus bufonia (C. & V.). 
17002, 37, 35-82 mm., Rio Colorado, Popoi River. Sept., 1921. 
17267, 3, 70-93 mm., Espia. July, 1921. 
Subfamily hypoptopomin^e 
Hypoptopoma joberti (Vaillant), Plate VIII, fig. 1. 
17008, 1, 58 mm., Cachuela Esperanza. Mar., 1922. 
Subfamily loricariin^e 
Loricaria typus Sleeker. 
17017, 3, 202-216 mm., Reyes. Nov., 1921. 
17019, 3, 240-280 mm., Lake Rogoagua. Oct., 1921. 
Loricaria lanceolata Gunther. 
17018, 1, 76 mm., Ixiamas. Dec., 1921. 
Loricaria carinata Castlenau. 
17020, 2, 260 mm., Lake Rogoagua. Oct., 1921. 
17021, 14, 38-165 mm., Lake Rogoagua. Nov., 1921. 
