xxxviii FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 

 RIO PRESIDIO SYSTEM. 



The Rio Presidio is a short stream on the western slope of the 

 Sierra Madre Mountains. The only collection of fishes known from 

 this river basin was made by Dr. D. S. Jordan at Presidio, a short 

 distance above its mouth. Here the stream flows with consider- 

 able current over a sandy and gravelly bed. 



The following is a list of the species taken at this place : 



Poecilia butleri Jordan: Presidio. 

 Pcecilia presidionis Jordan & Culver: Presidio. 

 Siphostoma starksi Jordan & Culver: Presidio. 

 Thyrina crystallina Jordan & Culver: Presidio. 

 Agonostomus monticola Bancroft: Presidio. 

 Cichlasoma beani (Jordan) : Presidio. 

 Philypnus dormitor (Lacep^de) : Presidio. 

 Dormitator maculata (Bloch) : Presidio. 

 Eleotris pictus Kner & Steindachner: Presidio. 

 Chonophorus taiasica (Lichtenstein) : Presidio. 

 Achirus mazatlanus (Steindachner) : Presidio. 

 Achirus fonsecensis (Gunther) : Presidio. 



RIO YAQUI SYSTEM. 



This river, like the Rio Mesquital, has its origin east of the Sierra 

 Madre Mountains, and the fish fauna of its upper tributaries is essen- 

 tially that of the Rio Grande. Very little is known concerning the 

 fishes in the lower part of this river. The northern tributaries, or 

 those which rise near the head waters of the Rio Gila, contain at least 

 a few Colorado river fishes. Of the fourteen species listed below, 

 four* properly belong to the Rio Colorado fauna ; twof are known 

 only from this basin ; the remaining eight belong to the Rio Grande 

 fauna. 



Amiurus price! (Rutter) : Mifiaca: "San Bernardino Creek." 



Pantosteus plebeius (Baird & Girard) : Mifiaca. 



tCatostomus sonorensis Meek: Mifiaca. 



tCatostomus bernardini Girard: San Bernardino Creek; Sonora. 



Campostoma ornatum Girard: Rucker Caflon. 



Pimelocephales confertus (Girard) : Mifiaca. 



*Gila minacae Meek: Mifiaca. 



Leuciscus nigrescens (Girard): Mifiaca; Morse Cafion; Opsura. 



Nototropis ornatus Girard: Mifiaca. 



Nototropis lutrensis (Baird & Girard) : Mifiaca. 



*Agosia chrysogaster Girard: Morse Cafion; Rucker Cafion; "near summit of 

 Sierra Madre." 



Cyprinodon elegans Baird & Girard; Mifiaca. 



*Pcecilia occidentalis (Baird & Girard) : San Bernardino Creek; Opsura. 



*Salmo irideus Gibbons: Reported by Mr. Jno. Ramsey to be abundant in head- 

 waters of Rio Yaqui. 



