368 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. 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 Gunther, Cat. Fish. Brit. Mus., Ill, 1861, 62 



(Western Ecuador). 

 Chonophorus taiasica (in part) Jordan & Eigenmann, Proc. U. S. Nat. 



Mus., IX, 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 giintheri 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., Zool. Ser., 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. 



