1536 Bulletin ^7, United States National Museum. 



with antero-inferior margin but slightly concave, its greatest width that 

 of orbit; each jaw with a pair of fangs, the lower separate; soft portions 

 of dorsal and anal fins scaly at base and not reaching beyond origin of 

 anal; first dorsal spine inserted behind vertical from upper end of gill 

 opening ; dorsal and anal spines slender, length of twelfth dorsal spine 

 that of head ; caudal rounded ; pectoral about as long as head and scarcely 

 reaching vertical from origin of anal; ventral pointed, slightly produced, 

 reaching only to vent ; distance between vent and root of ventral f length 

 of head; fold of lower lip continuous in middle. Scales on cheek small, 

 rather irregularly arranged, in about 8 series. Brown, irregularly mar- 

 bled with darker; fins black; an indistinct black band along operculum 

 and side of trunk; an oblique blackish band descending from eye toward 

 root of pectoral; a black spot behind angle of mouth. Length 6 inches. 

 Lake Nicaragua, Nicaragua. (Giinther.) (Named for Capt. John M. DOAV, 

 the collector of the types.) 



Heros dovii, GUNTHER, Proc. Zool. Soc. Lond. 1864, 154, Lake Nicaragua, Nicaragua ; Gt)N- 

 THEB, Fish. Centr. Am., 461, pi. 73, fig. 4, 1869. 



1940. HEROS GIBBICEPS, Steindackner. 



Head 2f ; depth 3 ; eye 5 in head. D. XVII or XVIII, 13 or 14 : A. VI, 9 or 

 10 ; scales 6-33-12. Body rather elongate, moderately compressed, the back 

 regularly arched. Adult with large fleshy lump above the eye to the 

 nape. Five rows of scales on cheek; preorbital moderate; mouth very 

 small, low; teeth slender; snout projecting beyond the mouth in the 

 adult; cleft of mouth arched, as long as broad, its length equal to that 

 of eye ; pectoral short, 1 J in head, as long as ventrals. Spines moderate ; 

 soft dorsal and anal scarcely pointed, scaly at base; caudal rounded. 

 Chocolate brown, yellowish below ; a row of dark blotches, 6 or 7 in num- 

 ber, along middle line of body from upper part of gill opening to base of 

 caudal; a dark streak on each scale parallel with the edge; vertical fins 

 vaguely mottled. Length 11 inches. Rio Teapa, Tabasco, Mexico. ( Stein - 

 dachner.) (gibbus, gibbous; - eepSj head.) 



Heros gibbiceps, STEINDACHNEB, Chromiden Mejicos, 12, 1864, Rio Teapa, Tabasco, Mexico. 



1941. HEROS MICROPHTHALMUS, Giinther. 



Head 3|; depth 2. D. XVIII, 13; A. V or VI, 10 or 9; scales 5-34-14. 

 Head as high as long; snout of moderate extent; preorbital wider than 

 eye; cleft of mouth rather narrow, horizontal, with jaws equal anteri- 

 orly; interorbital space very convex, twice as broad as orbit; eye a little 

 nearer to extremity of snout than to that of opercle ; vertical fins scaly 

 at base ; spinous dorsal low, length of twelfth spine ^ or rather less than 

 that of head ; free portion of tail rather higher than long ; pectoral 

 much shorter than head, equal in length to ventral, which does not extend 

 on to vent ; fold of lower lip continuous in middle ; 6 series of scales on 

 cheek. Brownish, with indistinct dark cross bands, and with a dark band 

 along sides and tail, terminating at a black spot in middle of root of cau- 

 dal; each scale 011 lateral and lower parts with a purple spot at base; soft 



