Dec. 28,1916. FisHes or PANAMA— MEEK AND HILDEBRAND, 231 
of this region, during the rainy season when the streams are high, often 
drag their canoes from the head waters of one basin to those of the other, 
and inasmuch as the fishes of the two streams are much alike it seems 
very probable that within comparatively recent times a gap remained 
somewhere along this water shed. 
The following species were obtained in the Rio Tuyra Basin: Family 
Siluride; Ageneiosus caucanus, Pimelodella chagresi, Pimelodus clarias 
punctatus, Rhamdia wagneri, Trachycorystes amblops: Family Lori- 
cartide; Leptoancistrus canensis, Lasiancistrus planiceps, Chetosto- 
mus fischeri, Ancistrus spinosus sp. nov., Plecostomus plecostomus, 
Loricaria fimbriata, Loricaria capetensis, aviceria filamentosa latiura, 
Loricaria variegata, Oxyloricaria citurensis, Oxyloricaria panamensis: 
Family Pygidiide; Pygidium striatus: Family Cyclopide; Cyclopium 
pirrense: Family Characide; Apareiodon dariensis, Astyanax ruberrimus, 
Astyanax fasciatus, Bryconamericus emperador, Brycon argenteus, Brycon 
striatulus, Gephyrocharax atricaudata, Creagrutus simus, Curimatus 
magdalene, Hemibrycon dariensis sp. nov., Hoplias malabaricus, Lucio- 
charax beant, Piabucina feste, Phanagoniates macrolepis, Pseudocheirodon 
affinis gen. et sp. nov., Compsura gorgone, Reboides occidentalis sp. nov., 
Thoracocharax maculatus: Family Gymnotide; Eigenmannia virescens, 
Hypopomus brevirostris, Sternarchus rostratus, Sternopygus dariensis sp. 
nov.: Family Paciliide; Mollienisia caucana, Priapichthys dariensis, 
Priapichthys tridentiger cana: Family Cichlide; Aiquidens ceruleo- 
punctatus, Cichlasoma calobrense, Cichlasoma tuyrense, Cichlasoma umbri- 
ferum, Geophagus crassilabris: Family Gobtide; Awaous transandeanus, 
Philypnus maculatus. 
Among the family Siluride there are again the two species, Pimelo- 
della chagresi and Rhamdia wagneri, occurring everywhere in Panama. 
Ageneiosus caucanus is common to the Rio Tuyra and the Rio Atrato, 
and the other two species of this family, while not identical, are very 
closely related to Atrato forms, from which they are slowly changing 
under the different environment. The genera Agenetosus, Pimelodus 
and Trachycorystes all reach the northern limit of their range in the Rio 
Tuyra. 
Under the family Loricariide, there is again the widely distributed 
species Plecostomus plecosiomus, and Chetostomus fischeri, the latter occur- 
ring on both slopes of Panama and quite surely also in Colombia. Lori- 
caria fimbriata and Loricaria filamentosa latiura also occur on the Atlantic 
slope of Colombia and Oxyloricaria panamensis occurs on both slopes 
of Colombia and in Ecuador and reaches its northern limit in the Rio 
Bayano. Ancistrus spinosus sp. nov., Loricaria variegata and Oxylori- 
caria citurensis also are found in the Rio Bayano. Leptoancistrus 
