DEC. 28, 1916. FISHES OF 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 Flsle de la Reunion, 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. 5. pittieri 

 Regan, recorded from Panama, was not seen. 



94. Sicydium salvini Grant. 



Sicydium salvini Grant, Proc. Zool. Soc. London, 1884, 159, PI. XII, 

 fig. 2 (Panama) ; Regan, Biol. Cent. Amer., Pisces, 1905, 10 (Panama; 

 Western Ecuador). 



Sicyopterus salvini Jordan & Eigenmann, Proc. U. S. Nat. Mus., IX, 

 1886, 485. 



Cotylopus salvini Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 



1898, 2208. 



Oreogobius rosenbergii Boulenger, Ann. & Mag. Nat. Hist., Ser. 7, IV, 



1899, 126 (Western Ecuador). 



