2208 Bulletin 47, United States National Museum. 



that of head. Second, third, and fourth dorsal spines produced into fila- 

 ments ; the third, which is the longest, twice height of body ; second dor- 

 sal higher than body. Color violet brown, yellowish in young specimens, 

 shaded with indistinct transverse bands of darker ; irregular brown spots 

 on axis of pectoral, and a broad dark band from base of pectoral to root 

 of caudal, both more or less indistinct in adult specimens; fins A r iolet, 

 clouded with darker. Length 4f inches. Streams about Mazatlan 

 (Ogilvie-Grant); not seen by us. (yvftvot, naked; yadrr/p, belly.) 



Sicydium gymnogaster, OGILVIE-&EANT, Proc. Zool. Soc. Lond. 1884, 158, pi. 11; fig. 2, and pi. 



12, fig. 6, Mazatlan. 

 Sicyopterus gymnogaster, JORDAN & EIGKNMANN, I. c., 485. 



2533. COTYLOPUS SALYINI (Ogilvie-Grant). 



Head 4; depth 6J. D. VI-9 or 10; A.I, 10; scales 78; eye 5| in head, 

 twice in interorbital space. Teeth in upper jaw tricuspid; the middle 

 cusp, which is situated at anterior end of tooth, very soft and soon becomes 

 worn away. Gum beneath upper lip smooth; a median papillose tubercle 

 above maxillary suture ; upper lip with a small median notch ; maxillse 

 containing an angle of about 75 ; horizontal teeth conspicuous. Scales 

 ctenoid, those on neck and belly smaller than those on body and tail. 

 Length of pectoral rather greater than that of head. Second and third 

 dorsal spines subequal and produced into short filaments, 1| times height 

 of body ; second dorsal not so high as body. Color olive brown; anal yel- 

 low, with a black and white band along margin; membrane of second 

 dorsal clear, spotted with brown; caudal with a dark and yellow band 

 round the extremity. Length 4f inches. Streams near Panama; 1 speci- 

 men known. (Ogilvie-Grant.) (Named for Osbert Salvin, who collected 

 largely in Central America for the British Museum.) 



Sicydium salvini, OaiLVlE-GRANT, Proc. Zool. Soc. Lond. 1884, 159, pi. 12, fig. 2, Panama. 

 Sicyopterus salvini, JOJRDAN & EIGENMANN, I. c., 485. 



811. EVORTHODUS, Gill. 



EvortJiodut, GILL, Proc. Ac. Nat. Sci. Phila. 1859, 195 (brevicept). 



Body elongate, covered with ctenoid scales of moderate size. Head 

 thick, short, naked. Isthmus moderate. Teeth in a single series, with 

 the crown emarginate, those of the lower jaw horizontal; no canines. 

 First dorsal of 6 spines ; ventral fins united, not adherent to the belly, 

 otherwise as in Gobius, so far as known, (sv, well; opQog, straight; 

 6d ov<3 } tooth.) 



2534. EVORTHODUS BREVICEPS, Gill. 



Head 4$, about as deep as wide; depth 4. D. VI-1, 10; A. 1, 11; eye 3. 

 Teeth emarginate, uniserial, those of lower jaw nearly horizontal. Snout 

 blant, profile evenly decurved ; caudal rounded, 3 in length of body ; some 

 of the dorsal rays filamentous. Color light brown, with irregular black- 

 ish blotches along sides; 2 black spots at base of caudal fin, 1 above the 

 other, alternating with 1 more anterior on the peduncle; first dorsal 



