Dec. 28, 1916. Fishes of Panama — Meek and Hildebrand. 303 



Color steel blue above, silvery-white below; sides with alternating 

 dark and pale stripes. The pale stripes occupy the middle of each row 

 of scales and the black ones are between the rows, occupying a portion 

 of 2 rows of scales. Base of caudal with a jet black spot, preceded by 

 a pale area. Fins unmarked, the dorsal caudal and anal a little darker 

 than the others. 



There are over 100 specimens of this species in the present collection, 

 ranging in length from 70 to 325 mm. It was taken in the Rio Tuyra, 

 and Rio Mamoni basins and in the Rio Marte Amade and Rio Juan 

 Diaz. 



We have for comparison specimens from the Rio Atrato Basin with 

 which our specimens seem to agree perfectly. 



Habitat: Pacific slope of Panama and both slopes of Colombia. 



32. Genus Hoplias Gill. 



Hoplias Gill, Proc. U. S. Nat. Mus., XXVI, 1903, 1015 (type Esox 



malaharicus Bloch). 

 Macrodon Muller & Troschel, Horas Ichth., 1842, 6 (type Esox mala- 

 haricus Bloch). (Preoccupied.) 



Body elongate, terete, slightly compressed; mouth large, with coni- 

 cal teeth, some canine-like; palatines with teeth; maxillary for most 

 part slipping under suborbital; no occipital process; no fontanel; air 

 bladder present; no adipose fin; dorsal and anal fins short. 



KEY TO THE SPECIES. 



a. Scales in lateral line 42 to 44; 11 rows across caudal peduncle 

 from one lateral line to the other; 5 complete rows between lateral 

 line and base of anal. microlepis, p. 303. 



aa. Scales in lateral line 39 to 41 ; 9 rows across caudal peduncle from 

 one lateral line to the other; 4 complete rows between lateral 

 line and base of anal. malaharicus, p. 305. 



47. Hoplias microlepis (Giinther). Perro Pesca or Pejeperro. 



Macrodon microlepis Gunther, Cat. Fish. Brit. Mus., V. 1864, 282 (Rio 

 Chagres; Western Ecuador); Eigenmann & Eigenmann, Proc. Cal. 

 Ac. Sci., 2nd Ser., 2, 1889, 102 (Obispo; Rio Chagres); Eigenmann, 

 Ann. N. Y. Acad. Sci., 1889, 102; Jordan & Evermann, Bull. U. S. 

 Nat. Mus., XLVII, 1896, 330; Boulenger, Boll. Mus. Torino, 

 No. 329, XIII, 1898, I (Rio Daule and Rio Vinces, Ecuador). 



Macrodon trahira var. microlepis Steindachner, Denkschr. K. Ak. 

 Wiss. Wien, XLI, 1880, loi (Guayaquil). 



