368 Fretp Museum or NaturaL History — Zoé.ocy, Vor. X. 
these specimens. It is probable that all the Atlantic slope specimens 
from Mexico to Brazil belong to this species. 
Habitat: Atlantic slope rivers, from Mexico south to Brazil, and the 
West Indies. © 
93. Awaous transandeanus (Giinther). 
Gobius transandeanus Giinther, Cat. Fish. Brit. Mus., III, 1861, 62 
(Western Ecuador). 
Chonophorus taiasica (in part) Jordan & Eigenmann, Proc. U. S. Nat. 
Mus., [X, 1886, 500. 
Awaous taiasica (in part) Jordan & Evermann, Bull. U. S. Nat. Mus., 
XLVII, 1898, 2236. 
Awaous nelsoni Evermann, Proc. Biol. Soc. Wash., XII, 1898, 3 (Sinaloa, 
Mexico); Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 1898, 
2235. 
Gobius giinthert Regan, Ann. & Mag. Nat. Hist., Ser. 7, XII, 1903, 629 
(Western Ecuador). 
Chonophorus transandeanus Regan, Biol. Cent. Amer., Pisces, 1905, 12; 
Meek, Field Mus. Nat. Hist. Pub., Zodl. Ger, X, 1914, 131 
(West slope of Costa Rica). 
Head 3 to 3.8; depth 5.1 to 5.9; D. VI-I, 10; A. I, 10; scales 60 
to 67. 
Body anteriorly subcylindrical, posteriorly compressed; head large; 
wider than deep; snout long, 2.1 to 2.5 in head; eye small, 5 to 6.9; inter- 
orbital 6.5 to 10; mouth large, horizontal; upper jaw projecting, the lips 
much thickened; maxillary reaching vertical from anterior margin of 
eye, 2 to 3.1 in head; teeth small, pointed, in a narrow band in each jaw; 
scales rather larger than in A. taiasica, about 16 rows between anterior 
rays of second dorsal and anal; head and chest mostly naked; origin of 
first dorsal slightly nearer tip of snout than base of last ray of second 
dorsal, the spines of moderate length, usually reaching to or more often 
past origin of second dorsal; origin of second dorsal a little in advance of 
anal, about midway between anterior margin of eye and base of caudal, 
the rays rather long; caudal fin scaly at base, its margin rounded; anal 
fin similar to second dorsal; ventral fins somewhat longer than snout; 
pectoral fins of moderate length, 1.38 to 1.8 in head. 
Color yellowish green; back and sides with dark markings; a series 
of dark blotches along median line of side, at each blotch there is a 
narrow, black cross-bar; sides of head with dark bars. Dorsals, caudal 
and usually also the pectorals with dark spots on the rays, forming cross- 
bars; pectoral with a short black bar at base of upper rays, running back- 
ward and downward; anal and ventrals unmarked. 
