PACIFIC SLOPE OF ECUADOR, PERU AND CHILI. 607 



Maranon, in eastern Ecuador. He refers in the same paper to 

 Brycon atricaudatus collected by Rosenberg at Paramba in the Mira 

 basin, and describes as new Tetragonopterus sinius from the Chota 

 valley in northern Ecuador (Mira basin). 



The localities given for a number of species make it doubtful 

 whether the identification is correct or whether the locality label 

 with the specimen has not been misplaced. It is questionable, for 

 instance, whether Astyanax fasciatus was taken in the Peripa, 

 whether Brycon atricaudatus came from east of the Andes, whether 

 the specimens identified as Salminus affinis from east of the Andes 

 are the same as the Salminus affinis from the Cauca River; 

 whether the Leporinus from the Vinces is the fredcrici of the east- 

 ern rivers, whether the specimens listed under Brycon striatulus 

 from the Rio Santiago actually belong to that west coast species; 

 whether the Pygidium tcenium is the same as the tcenimn from the 

 elevated portions of the western slope of the Andes ; whether, finally, 

 Chcetostomus dermorhynchus is actually present both on the At- 

 lantic and the Pacific sides of the Andes of Ecuador. 



Sixty-odd species of fresh-water fishes have been taken in the 

 Guayas basin. Of these the species of Astrohlepus and Pygidium 

 belong to the highest altitudes and follow their own laws of dis- 

 persal. Twenty belong to families and genera that are found only 

 in the lowland, some of them indiflferently in salt or fresh water 

 (Hexanematichthys, Stolephoridce, Hcemulidce, Tylosurus, Cenfro- 

 poniidcu and Gohiidce)}^ This leaves of strictly fresh-water species 

 only forty. Of the forty only Sternopygus macrurus is certainly 

 found east of the Andes. ^^ Only four of the species extend north 

 of the Rio Esmeraldas}"^ These are Chcetostomus fischeri north 

 to the Chagres; Chcetostomus marginatus north to the San Juan; 



^° They are marked with * in the table. 



^''- Hemihrycon polyodon is recorded from the basin of the Santiago east 

 of the Andes. It is quite within possibilities that the specimens recorded 

 from Guayaquil also came from the east. Pellegrin has recorded Ancistrus 

 bufonius from the Rio Pove at Santo Domingo de los Colorados, 560 m. I 

 am not sure whether the Pove drains into the Esmeraldas or the Guayas, but 

 the identification may be doubted for the present. 



^-Brycon atricaudatus has been recorded from the R. Mira just north 

 of the Esmeraldas. 



