460 eigenmann: fish fauna of Bogota 



Inhabiting the boulder-strewn or sandy, but low and marshy shores 

 at points along Ombabika and Orient bays, Lake Nipigon, Ont. The 

 type is our No. 6,944, from the marsh at the head of Ombabika Bay, 

 north end of Lake Nipigon, Ontario, O. E. & G. K. Jennings, Aug. 

 15, 1914; other collections are 6,633 ^^^ 6,636, O. E. & G. K. Jennings, 

 Aug. 6, 1 914, and No. 7,001, O. E. & G. K. Jennings, north shore of 

 Ombabika Bay, Aug. 16, 19 14. Specimens in Carnegie Museum Her- 

 barium. 



ICHTHYOLOGY.— r/j^ fish fauna of the Cordillera of Bogota.^ 

 Carl H. Eigenmann. 



The Cordillera de Bogota (or Oriental of Colombia) extends 

 from the equator northeastward to about the seventh degree of 

 north latitude. It is continued northward as the Sierra de 

 Perija to the Sierra Nevada de Santa Marta and northeastward 

 as the Cordillera de Merida to Barquisimeta. The Maracaibo 

 basin lies between the Cordilleras de Perija and Merida. It 

 rises to a height of over 10,000 feet and forms an effective barrier 

 to the intermigration of lowland forms for its entire length 

 from near the equator to the Cordilleras of Perija and Merida. 

 The Cordillera of Perija is the chief barrier between the Mara- 

 caibo basin and the Magdalena and the Cordillera of Merida 

 between the Maracaibo and the Orinoco. It contains a series 

 of highland plateaus or parks, of which the Plain of Bogota near 

 its center, with an elevation of about 9,000 feet, is the best known. 

 Its fresh-water fish fauna consists mostly of various species of 

 Astroblepus and Pygidium, three species of Pseudancistrus, a 

 Chaetostomus, and two species of Hemibrycon, all of which are 

 mountain genera, the latter most frequently dipping into the 

 lowland. Two genera, Grundulus and Eremophilus, are peculiar 

 to the highland plateaus. Very few lowland genera and species 

 ascend some distance on the slopes of these Cordilleras. Far- 

 lowella acus causes some surprise on the eastern slope at 4,500 

 feet. It is usually found much lower. Creagrutus magdalenae 

 and Argopleura cause greater surprise at Alban, at over 7,000 

 feet. These genera are usually found in much lower altitudes. 

 The greatest surprise is furnished by Creagrutus bent at San Gil. 



* Contribution from the Zoological Laboratory of Indiana University, No. 178. 

 Received July 26, 1920. 



