46 
Indiana University Studies 
Gephyrocharax chocoensis Eigenmann. 
17289, 32, 50-62 mm., Rurrenabaque. Oct., 1921. 
17290, 16, 50-63 mm., Tumupasa. Dec., 1921. 
17291, 9, 43-68 mm., Popoi River, Upper Beni. Sept., 1921. 
17292, 6, 53-70 mm., Ixiamas. Dec., 1921. 
17293, 1, 54 mm., Huachi. Aug., 1921. 
Comparison with the paratypes of G. chocoensis from the 
Pacific side of Colombia shows these specimens to be the same. 
They usually possess 2 more anal rays and have a distinct 
humeral spot. 
Subfamily gasteropelecin^e. 
Thoracocharax stellatus (Kner). 
17144, 11, 40-55 mm., Cachuela Esperanza. Mar., 1922. 
17145, 56, 34-73 mm., Lake Rogoagua. Nov., 1921. 
17146, 11, 45-65 mm., Rurrenabaque. Oct., 1921. 
Subfamily CHALCINUUE. 
Chalcinus angulatus curtus Garman. 
17139, 46, 38-200 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
17140, 14, 25-52 mm., Lake Rogoagua. Nov., 1921. 
17141, 9, 50-65 mm., Cachuela Esperanza. Mar., 1922. 
17142, 3, 135-150 mm., Rurrenabaque. Oct., 1921. 
All the young specimens of 17140 may not belong to this 
variety. 
Chalcinus albus (Cope). 
17143, 5, 68-88 mm., Cachuela Esperanza. Mar., 1922. 
17307, 1, 135 mm., Rurrenabaque. Oct., 1921. 
Brachy chalcinus copei (Steindachner) . 
17261, 8, 36-75 mm., Ixiamas. Oct., 1921. 
Clupeacharax Pearson, gen. now 
Compressed, elongate; upper profile straight; breast with 
a median keel ; premaxillary with 2 series of teeth, 2 teeth in 
the anterior series, 5 teeth in the inner series ; no teeth in the 
maxillary which is very long and slender, widened in front; 
mandible with a series of 3 five- to six-pointed teeth ; gill mem- 
branes free from the isthmus and from each other; origin of 
the anal in advance of the origin of the dorsal ; ventrals small ; 
pectorals large, falcate; adipose fin present; anal long; lateral 
line complete, with the appearance of an anchovy. 
