12 ACANTHOPTERYGII. 
Chonophorus taiasica, Jord. & Eigenm. Proc. U.S. Nat. Mus. 1886, p. 500 6; Eigenm. & 
Eigenm. Proc. Cal. Ac. (2) i. 1881, p. 68°; Meek, Zool. Pub. Columbian Mus. v. 
1904, p. 233". 
Chonophorus mecicanus, Jord. & Kigenm. t.c. p. 501; Eigenm. & Eigenm. I. c. 0: Meek, |. ¢.”. 
Awaous taiasica, Jord. Proc. Cal. Ac. (2) v. 1895, p. 494” ; Jord. & Everm. Bull. U.S. Nat. 
Mus. xlvii. 1898, p. 2236”; Jord. & Snyd. Bull. U.S. Fish. Comm. 1900, p. 147; Meek, 
Zool. Pub. Columbian Mus. iii. 1902, p. 121”. 
Awaous mexicanus, Jord. & Everm. t. c. p. 2237 *. 
Depth of body 5 to 6 in the length, length of head 3 to 33. Dorsal VI, I 10. AnalI 10, 66 to 84 scales 
in a longitudinal series, 20 to 26 in a transverse series from origin of second dorsal to that of the 
anal fin. Olivyaceous; back and sides with irregular dark spots; sides of head with spots or oblique 
lines; a dark bar on the upper part of base of pectoral; dorsal, caudal, and pectoral fins with series of 
dark spots; ventrals and anal immaculate. 
Hab. Coasts and Rivers of Tropical America from Southern California to Panama and 
from Mexico to Brazil, and also in the West-Indian Islands: 
Cape St. Lucas ®.—Presidio*; Puente de Ixtla; Balsas and Cuautla; Rio 
Balsas 18 25; Valles, San Luis Potosi}; San Francisco, La Antigua and Perez, 
Vera Cruz182; Orizaba!®; San José®; Rio Motagua (Salvin); Panama 17, 
Cuba 10111213. Haiti2; Martinique? 17; St. Vincent, St. Croix !’; St. Lucia 1’; 
Barbados 17; Trinidad (Guppy) ; Brazil 1. 
Here described from several specimens, measuring up to 300 mm. 
9. Chonophorus transandeanus. 
Gobius transandeanus, Giinth. Cat. Fish. iii. p. 62 (1861) *. 
2 Awaous nelsoni, Everm. Proc. Biol. Soc. Washington, xii. 1898, p.3°; J ord. & Everm. Bull. 
U.S. Nat. Mus. xlvii. 1898, p. 2285 °. 
Gobius guentheri, Regan, Ann. Mag. N. H. (7) xii. 1908, p. 629°. 
Differs from C. banana especially in having only from 15 to 18 scales between the origins of the second 
dorsal and anal fins. 
Hab. Western Mexico, Rosario, Sinaloa 2? °.—WeEsteRN Ecuapor ! ¢. 
G. guentheri was based on male examples, which differ considerably from the 
females. Probably A. nelsoni will prove to be identical with G@. transandeanus, and 
the species will be found to occur in all the Pacific Coast streams from Sinaloa to 
Ecuador. 
6. GOBIUS, Linn. 
Gobius, Jord. & Everm. Bull. U.S. Nat. Mus, xlvii. 1898, p. 2210. 
Body more or less elongate, compressed posteriorly ; mouth moderate; jaws with several series of pointed 
teeth ; palate toothless. Eyes placed high; interorbital region not very wide. Gill-opening nearly 
vertical, in front of the base of pectoral, not or scarcely produced forward below; no fleshy flaps on 
pectoral arch. Scales usually ctenoid. Two dorsals, the anterior of five to seven spines. Ventrals 
completely united to form a rounded disc, which is free from the body and has a basal membrane. 
