Dec. 28,1916. FisHes or PANAMA— MEEK AND HILDEBRAND. 369 
This species is represented by over 100 specimens, ranging from 33 to 
200 mm. in length. Common in all the streams of the Pacific slope of 
Panama from the Rio Chame eastward to the Rio Tuyra, ranging from 
the head of tide to the upper courses of the streams. 
This species differs slightly from the preceding in several respects. 
The principal differences are mentioned in the key. We have compared 
our specimens with specimens from the Pacific slope of Costa Rica and 
of Colombia and find them all to be identical. It is probable that all 
the Pacific slope specimens from Mexico to Ecuador belong to this species. 
Habitat: West slope rivers from Mexico south to Western Ecuador. 
57. Genus Sicydium Cuvier & Valenciennes. 
Sicydium Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 1837, 167 
(type Gobius plumieri Bloch). 
Cotylopus Guichenot, in Maillard, Notes sur |’Isle de la Réunion, II, 
1864, Addendum 9 (type Cotylopus acutipinnis Guichenot). 
Sicya Jordan & Evermann, Report U. S. Fish Comm., 1896, 456 (type 
Sicydium gymnogaster Grant). 
Body elongate, anteriorly subcylindrical, posteriorly compressed; 
head low, broad; eyes lateral, placed high; snout very blunt; mouth 
horizontal; upper jaw in advance of the lower; the lips thick; teeth in 
upper jaw in a single series, numerous, slender, curved inward, tri- 
cuspid, bicuspid, or simple; lower jaw with 2 series, the outer series 
nearly horizontal and partly or completely hidden in the gums, the 
second series pointed and nearly vertical, none on vomer; gill-opening 
vertical, not extended forward; body nearly or entirely covered with 
small ctenoid scales; dorsal fins 2, well separated; caudal fin rounded; 
ventral fins united, more or less attached to abdomen, forming a sucking 
disc. But one species of this genus was taken by us. S. pittieri 
Regan, recorded from Panama, was not seen. 
94. Sicydium salvini Grant. 
Sicydium salvint Grant, Proc. Zool. Soc. London, 1884, 159, Pl. XII, 
fig. 2 (Panama); Regan, Biol. Cent. Amer., Pisces, 1905, 10 (Panama; 
Western Ecuador). 
Sicyopterus salvinit Jordan & Eigenmann, Proc. U. S. Nat. Mus., IX, 
1886, 485. 
Cotylopus salvint Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 
1898, 2208. 
Oreogobius rosenbergit Boulenger, Ann. & Mag. Nat. Hist., Ser. 7, IV, 
1899, 126 (Western Ecuador). 
