366 Field Museum of Natural History — Zoology, Vol. X. 



Chonophorus Poey, Memorias, II, 1861, 274 (type Chonophorus huc- 



culentus Poey = Gobtus iaiasica Lichtenstein). 



Body elongate, anteriorly subcylindrical, posteriorly compressed; 

 head rather low and broad; eyes placed high; mouth large, horizontal; 

 upper jaw more or less projecting; the lips thickened; shoulder girdle 

 with 2 or more dermal flaps, projecting into gill-cavity and covered by 

 opercle; gill-openings rather small, scarcely produced forward; teeth 

 pointed, in narrow bands in the jaws, none on vomer; scales small, mostly 

 ctenoid; head and chest mostly naked; dorsal fins 2, well separated; 

 caudal fin rounded; ventral fins completely united, forming a disc, free 

 from the body. This genus is represented by 2 species in Panama, which 

 are closely related, but differ somewhat in several characters. 



KEY TO THE SPECIES. 



a. Scales very small, 69 to 76 in lateral series; about 20 rows between 

 base of anterior rays of second dorsal and anal ; mouth moderate, 

 the maxillary failing to reach vertical from anterior margin of 

 eye, about 2,7 in head in specimens 150 mm. in length; fins low, 

 the spinous dorsal failing to reach origin of second dorsal when 

 deflexed; sides with dark blotches, but without black cross-bars. 



taiasica, p. 366. 



aa. Scales somewhat larger, 60 to 67 in lateral series, about 16 rows 

 between base of anterior rays of second dorsal and anal; mouth 

 large, the maxillary reaching vertical from anterior margin of 

 eye, about 2.1 in head in specimens 150 mm. in length; fins high, 

 the spinous dorsal usually reaching to or past origin of second 

 dorsal when deflexed; sides with dark blotches and with narrow, 

 black cross-bars. transandeanus, p. 368. 



92. Awaous taiasica (Lichtenstein). 



Gobius taiasica Lichtenstein, Berl. Abhandl., 1822, 273 (Brazil). 



Gohins banana Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 1837, 103 



(San Domingo); Gunther, Cat. Fish. Brit. Mus., Ill, 1861, 59. 

 Gobius mariinicus Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 1837, 



105 (Martinique). 

 Chonophorus bucculentus Poey, Memorias, II, 1861, 275 (Cuba). 

 Rhinogobius contractus Poey, Memorias, II, 1861, 424 (Cuba). 

 Rhinogobius bucculentus Poey, Synopsis, 1868, 394. 

 Gobius dolichocephalus Cope, Trans. Amer. Philo. Soc. Phila., 1869, 403 



(near Orizaba, Mexico). 

 Euctenogobi:is latus O'Shaughnessy, Ann. & Mag. Nat. Hist., Ser. 4, 



XV, 1875, 146 (Bahia, Brazil). 



