THE AMERICAN TETRAGONOPTERINAE. 291 



Specimens examined. 



Catalogue Number of Size 



number specimens in mm. Locality 



G241 Field Mus. 2 IIG Rio Machucha, Costa Rica 



Type & Paratype 



6267 Field Mus. 3 Chitaria, E. slope Costa Rica 



6361 Field Mus. 1 Siguares, E. slope D'Alfaro, Costa Rica 



Head 4.5; depth 2.66; D. 11; A. 26; scales 7-38-7; eye equals snout, 

 3.5 in the head; interorbital i the head behind the second nareal opening; 

 second suborbital leaving one third of the cheek naked. 



Snout rounded; postventral area broadly rounded, dorsal more than an 

 orbital diameter nearer the snout than to the middle caudal rays; pectorals 

 reaching within two scales of the ventrals. 



A vertically oval humeral spot, the ventral prolongation scarcely evident, 

 crossing the 3d and 4th scales of the lateral Une. Dorsal whitish with very few 

 chromatophores ; anal lobe without chromatophores, the rest of the fin with a 

 few ; caudal spot extending to the end of the fin. 



Very closely related to if not identical with A. regani. 



The above description is based on the type. 



The paratype in the Field Museum also 6241 has the eye 3 in the head, 

 longer than the snout, the anal with 30 rays. The dorsal a little nearer the 

 caudal than in the type, the second suborbital leaves a much narrower naked 

 area than in the type. 



46. AsTYANAX NicARAGUENSis Eigeumanu and Ogle. 

 Plate 66, figs. 5-7. 



Astyanax rutilus rticaragmnsis Eioenmann & Ogle, Proc. U. S. N. M., 1907, 33, p. 23 (Nicaragua). 

 Astyanax fasciatus nicaraguensis Eigenmann, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 433. 



Habitat. — Nicaragua. 



Specimens examined. 



Size 

 in mm. Locality Collector 



Nicaragua Bransford 



57-67 about Nicaragua Bransford 



Maxillary slender, having 2-8 teeth. In the latter case the teeth extend- 

 ing along more than half the length of the bone. Of thu-ty-five specimens, there 



