360 Field Museum of Natural History — Zoology, Vol. 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., XH, 1837, 

 223 (Martinique); Giinther, Cat. Fish. Brit. Mus., HI, 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., IX, 1886, 

 483; Jordan & Evermann, Bull. U. S. Nat. Mus., XLVH, 1898, 

 2198. 



