bs 
a a 
Marcu, 1914. List or Fisnes or Costa Rica — MEEK. 133 
Family Pleuronectide. 
Citharichthys spilopterus Ginther. 
Citharichthys spilopterus Gianther, Cat., 1v, 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 (1), 155 mm. 
Family Soleide. 
Achirus fonsecensis (Giinther). 
Solea fonsecensis Ginther, Cat., tv, 1862, 475 (Gulf of Fonseca). 
Achirus fonsecensts 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, Pecilia 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 aly 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, Reboides 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 José; 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. rogerst, is quite abundant in the streams forming the head waters 
of the Rio Tarcoles and the Rio Reventazon, the other, R. wagnert, is 
known only from the lowlands. It no doubt occurs on the Atlantic 
side of Costa Rica although not yet taken there. The Peciliide are 
represented by 14 species, 8 on the Atlantic side and ro on the Pacific, 
