March, 1914. List of Fishes of Costa Rica — Meek. 133 



Family Pleuronectidae. 



Citharichthys spilopterus Giinther. 



Citharichthys spilopterus Giinther, Cat., iv, 1862, 421 (New Orleans). 



This species is said to vary considerably. The specimen taken in 

 the river at La Victoria has head 3.6; depth 2.0; dorsal rays 69; anal 

 rays 53; scales 53; eye 5.9 in head; maxillary 2.5; pectoral 2.0. 



La Victoria (i), 155 mm. 



Family Soleidae. 



Achirus fonsecensis (Giinther). 



Solea fonsecensis Gunther, Cat., iv, 1862, 475 (Gulf of Fonseca). 



Achirus fonsecensis Regan, Biol. Cent. Amer., 1906, 3 (Gulf of 

 Fonseca, and Rio Presidio). 



Jesus Maria (24), 30 to 80 mm. 



In the foregoing list there are recorded 71 species of fishes; all 

 except two have been known to occur in the fresh waters of Costa Rica. 

 The two, PoBcilia sphenops and Cichlasoma maculicauda, occur in the 

 brackish and fresh water near the coast from Mexico to Panama, and 

 no doubt are to be found in Costa Rica. 



The Characins and the Cichlids are the only families treated of in 

 this paper which belong strictly to fresh water. Of the Characins there 

 are nine species, six occurring on the Atlantic and four on the Pacific 

 side. One species, Rcehoides guatemalensis , a lowland form, occurs on 

 both sides. It ranges from southern Mexico south into South America. 

 The Cichlids are represented by 15 species; 12 occur on the Atlantic 

 and 6 on the Pacific side, three species being common to both sides. 

 None of the species of these two families is found in the streams about 

 San Jose; they exceed but little, if any, an altitude of 1000 meters. 



The catfishes belonging to the genus Rhamdia, a fresh-water group, 

 are represented by 5 species, four occurring on the Atlantic and 3 on 

 the Pacific side, two species being common to both sides; one of these, 

 R. rogersi, is quite abundant in the streams fonning the head waters 

 of the Rio Tarcoles and the Rio Reventazon, the other, R. wagneri, is 

 known only from the lowlands. It no doubt occurs on the Atlantic 

 side of Costa Rica although not yet taken there. The PoeciliidcB are 

 represented by 14 species, 8 on the Atlantic side and 10 on the Pacific, 



