358 Fre~tp Museum or Naturat History — Zoétoey, Vor. X. 
Color bluish black above, paler below; ventral surface of head and 
body marbled or spotted with light and dark markings. These mark- 
ings become obscure in large examples (250 mm. and more in length). 
No dark lines along the rows of scales. Fins all with dark and pale 
markings, forming alternating dark and pale bars, these also become 
obscure and disappear in large individuals. 
This species is represented by 56 specimens, ranging from 60 to 440 
mm.inlength. It is common, but not abundant, in the lowland streams 
on the Pacific coast of Panama eastward to the Rio Bayano, but it was 
not taken in the Rio Tuyra. 
The alimentary canal is short, no pyloric coeca; air bladder thin, 
adnate to the back. One specimen, 370 mm. in length, had swallowed 
a fish (Philypnus maculatus) 210 mm. in length. The head of this mor- 
sel was at the vent and partly digested, and the tail was visible in the 
mouth. 
This species is closely related to E. pisonis, from which it apparently 
differs only in the characters mentioned in the key. 
Habitat: West coast and streams, from California to Panama and 
Ecuador. 
85. Eleotris pisonis (Gmelin). 
Gobius pisonis Gmelin, Linn. Syst. Nat., 1788, 1206 (based on Eleotris 
capite plagioplateo Gronow, Mus. Ichth., II, 1757, 168, which in 
turn was based on Amore pixuma Marterive & Piso, Hist. Brasil., 
IV, 1648, 166 (Brazil)). 
Gobius amorea Walbaum, Artedi Piscium, III, 1792, 205 (based on 
Eleotris capite plagioplateo Gronow). 
Eleotris pisonis Schneider, in Bloch’s Syst. Ichthyol., 1801, 68; Eigen- 
mann & Fordice, Proc. Ac. Nat. Sci. Phila., 1885, 75; Jordan & 
Evermann, Bull. U. S. Nat. Mus., XLVII, 1898, 2200; Regan, Biol. 
Cent. Amer., Pisces, 1905, 7. 
Eleotris gyrinus Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 1837, 
220, Pl. 356 (Martinique; San Domingo; Surinam). 
Culius perniger Cope, Proc. Am. Phil. Soc., 1870, 473 (Brazil). 
Culius belizianus Sauvage, Bull. Soc. Philom. Paris, 1879, 55 (Belize; 
Cayenne). 
Head 2.9 to 3.23; depth 4.12 to 6; D. VI-I, 8; A. I, 8; scales 59 
to 68. 
Body elongate, anteriorly subcylindrical, posteriorly compressed, a 
little deeper and somewhat more rubust than in E. picta, this difference 
being most evident in a comparison of specimens of like size; head some- 
what depressed above, the profile concave over eyes; snout broad, 3.85 
