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NEW SPECIES OF FISHES FROM COSTA RICA. 
BY SETH EUGENE MEEK. 
During the month of April last I collected fishes in some of 
the rivers of Costa Rica. The following paper gives an account of 
those species which appear to be undescribed. ~ 
In making this collection of fishes I wish to acknowledge the aid 
received from agents of the United Fruit Company, and from Dr. Alfaro 
and Prof. Tristan of San Jose. 
A complete account of the collection will be published in the near 
future.! 
Astyanax robustus sp. nov. 
Type No. 7582, F. M. N. H.; length 132 mm.; Virginia, Costa Rica. 
Head 4.1 to 4.4; depth 2.8 to 3.0; D. 1, 9; A. 2, 27; scales 7%, 37, 6%. 
Body robust, moderately compressed, the caudal peduncle especially 
deep; profile slightly convex; top of head convex; fontanelle large, 
extending from anterior margin of the orbit to nape; margin of upper 
lip slightly below the level of middle of the eye; lower jaw slightly the 
longer, the lip thick; maxillary to anterior third of orbit, its length 2.3 
to 2.4 in head; diameter of eye 3.0 to 3.5; snout 4.2 to 4.6; cheek 2.6 to 
2.8; maxillary teeth 4-4, the cusps 3 to 5; premaxillary teeth in 2 
series, the outer 4-4, each of 3 to 5 cusps; inner series 5-5, similar to the 
outer but slightly larger; lower jaw with teeth in one series, the anterior 
teeth large 4-4, with 3 to 5 cusps, the lateral teeth 6-6 smaller and 
subcontinuous, the anterior ones usually with 3 cusps, the posterior 
ones of one cusp; gill rakers 7-+-9; a few near each end with their tips 
branched; dorsal fin behind ventrals, its origin nearer tip of snout than 
base of caudal by about a distance of diameter of eye; base of anal 3.0 
to 3.2 in body; pectoral of 12 rays, its length 5.1 to 5.5; ventral 7.4 to 
8.2, its rays 8; caudal peduncle 1.6 to 1.8 in head; lateral line complete; 
vertebrae 11+ 22= 33. : E 
Color dark brown, little silvery, fins in life with red or yellowish 
red, the body more or less tinged with the same color; all of the fins 
dusky. 
1TIssued September 18, 1912. 
69 
