eigenmann: fresh water fishes. 299 



T XiphopJiorus montesmncE Jordan & Snyder. 



Me Poniadasys templei Meek. 



S Cichlasoma steindacJinen]oxA-3iX\ & Snyder. 



S Cichlasonia bartoni (Bean). 



S HerichtJiys cyanoguttatinn (Baird & Girard). 



S Neotvopliis carpintis Jordan & Snyder.^ 



T PJiilypnits doymitor (Lacep^de). 



T CJioiwpJioriis taiasica (Lichtenstein). 



This number of species was taken from near tide level to an elevation 

 of almost 2000 feet. 



On the Pacific slope the Rio Presidio, a short, insignificant stream, at 

 Mazatlan is near the tropic. North of it no South American elements 

 are found. 



Its fishes are : 

 T Pcccilia bnf/cn ]ord2in. 

 T Pcccilia presidionis Jordan & Culver. 

 Me SipJwstoiua starksi]oxdi2Si & Culver. 

 Me Thyyina cyystallina Jordan & Culver. 

 T Agonostonitis monticola Bancroft. 

 S CicJilasoma bcani (Jordan). 

 T P hi ly pints doymitoy (Lacep^de). 

 T Doyiuitatoy maculata (Bloch). 

 T Elcotyis pictus Kner & Steindachner. 

 T Choiiophoyns iaiasiciis (Lichtenstein). 

 Me Achiyus niazatlanus (Steindachner). 

 Me Achiyus fonsecensis (Giinther). 



Only Cichlasonia beani is distinctly tropical American. Agonostomtis is 

 Central American ; the rest are types that would cause no surprise 

 anywhere in a coastwise stream between the United States and South 

 America. 



The Rio Presidio, the Rio Mezquital to the south and the Rio Yaqui 

 to the north, are on the slope of the Sierra Madre opposed to the slope 

 drained by the Rio Grande. Confining ourselves for the present to the 

 consideration of replacement of the northern by the southern fauna, we 

 shall return to a comparison of their fauna with that of the Rio Grande. 



* This species is included in the synonymy of the one preceding it in the systematic part of this 

 report. 



