52 
Indiana University Studies 
ORDER SYNENTOGNATHI. 
Family Belonkle. 
Potamorrhaphis guianensis (Schomburgk) . 
17253, 15, 115-205 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
17254, 2, 103 and 142 mm., Lagoons near Reyes. Oct., 1921. 
ORDER PERCOMORPHI. 
Family Sclenhle. 
Plagioscion auratus Castelnau. 
17251, 21, 50-295 mm., Lake Rogoagua. Oct., 1921. 
Family Cichlid m . 
Chaetobranchus flavescens Heckel. 
17061, 2, 225 and 230 mm., Lagoons near Reyes. Oct., 1921. 
17062, 1, 230 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
Acaropsis nassa (Heckel). 
17047, 3, 125-155 mm., Lagoons near Reyes. Oct., 1921. 
17048, 2, 125 mm., Reyes. Nov., 1921. 
Astionotus ocellatus (Agassiz) . 
17063, 1, 230 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
17064, 3, 165-230 mm., Reyes. Nov., 1921. 
fEquidens tetramerus (Heckel). 
17068, 11, 115-180 mm., Lagoons near Reyes. Oct., 1921. 
fEquidens portalegrensis (Hensel). 
17069, 28, 27-140 mm., Cachuela Esperanza. Mar., 1922. 
17070, 30, 15-90 mm., Ivon. Feb., 1922. 
17071, 33, 30-62 mm., Rurrenabaque. Oct., 1921. 
17072, 2, 75 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
None of the specimens I secured have more than 3 spines 
in the anal and therefore cannot be Cichlasoyna bimaculatum. 
I have compared them with A. portalegrensis from the Para- 
guay system and do not find them differing more than the 
specimens among themselves. 
fEquidens dorsigera (Heckel). 
17073, 1, 40 mm., Lagoon near Reyes. Oct., 1921. 
17074, 2, 45-50 mm., Lagoons, Lake Rogoagua. Nov., 1921. 
