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.^ 



Aslyanax 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. i, 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. 



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. 



^Issued September 18, 19 12. 



69 



