360 Fretp Museum or Naturat History — Zoétoey, Vor. X. 
bedded scales; chin, cheeks and snout with rows of pores, forming a net 
work, these most distinct in young; a concealed preopercular spine, 
directed downward and forward; teeth small, pointed, in bands; gill- 
rakers undeveloped; gill-membranes attached to isthmus; scales rather 
large (average in lateral series, for 25 specimens, 48—), about 12 longi- 
tudinal rows of scales between base of second dorsal and anal, all the 
scales ctenoid, except the small scales in advance of dorsal and on abdo- 
men; origin of first dorsal midway between end of snout and tips of 
rays of second dorsal, the spines short and weak, reaching origin of 
second dorsal; origin of second dorsal an eye’s diameter in advance of 
anal; caudal fin with small scales at base, its margin strongly convex; 
anal fin similar to second dorsal; ventral fins rather small, inserted under 
base of pectorals; pectoral fins rather long, reaching well beyond the tips 
of ventrals, 1.13 to 1.45 in head. 
Color uniform brownish, somewhat paler below than above. Rows 
of scales with dark stripes; dorsal fins and caudal and sometimes the 
anal with light and dark spots or bars; ventrals and pectorals plain 
dusky brown. . 
We have 57 specimens of this species, ranging from 19 to 85 mm. in 
length. All are from the lowland streams, ditches and ponds on the 
Atlantic coast. A few of the specimens were taken in strictly fresh 
water, but the majority of them are from brackish and salt water. 
This species differs from E. pisonis principally in the notably larger 
scales. We have designated as the type a specimen 85 mm. in length 
from Mindi, Canal Zone. 
52. Genus Guavina Bleeker. 
Guavina Bleeker, Esquisse d’un Syst. Nat. Gobioid., 1874, 302 (type 
Eleotris guavina Cuvier & Valenciennes). 
This genus is related to Eleotris, from which it differs in the structure 
of the skull, the absence of the preopercular spine and in the very small 
scales, usually 100 or more in a lateral series. 
87. Guavina guavina (Cuvier & Valenciennes). 
Eleotris guavina Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 1837, 
223 (Martinique); Ginther, Cat. Fish. Brit. Mus., III, 1861, 124 
(Demerara); Regan, Biol. Cent. Amer., Pisces, 1905, 7. 
Guavina guavina Eigenmann & Fordice, Proc. Ac. Nat. Sci. Phila., 
1885, 73; Jordan & Eigenmann, Proc. U. S. Nat. Mus., [X, 1886, 
483; Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 1898, 
2198. 
