462 DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 
spines slender, the length of the twelfth of the dorsal fin being one-fourth of that of the 
head. Pectoral three-fifths as long as the head. Brown, irregularly marbled with 
darker; fins black; an indistinct black band along the operculum and the side of the 
trunk; an oblique blackish band descends from the eye towards the root of the pectoral ; 
a black spot behind the angle of the mouth. 
This species is allied to H. friedrichsthalii, H. salvini, &c. 'IT'wo specimens, 6 inches 
long, were collected by Capt. Dow in the Lake of Nicaragua. 
Description.—Head much longer than high. Snout rather elongate, much longer than 
the eye, pointed, with the cleft of the mouth oblique, and the lower jaw very prominent. 
‘he maxillary reaches the vertical from the anterior margin of the orbit. The width of 
the orbit is contained four times and a half in the length of the head, and equal to that 
of the interorbital space. ‘The eye is situated immediately below the upper profile, but 
is considerably nearer to the end of the snout than to that of the operculum. Opercles 
scaly, the scales on the operculum larger than those on the cheek; suboperculum with 
two series of scales. The soft portions of the dorsal and anal fins are scaly at the base, 
and do not reach much beyond the origin of the caudal. Caudal rounded. The 
pectoral is about two-thirds as long as the head, and scarcely reaches the vertical from 
the origin of the anal. Ventral pointed, slightly produced, reaching only to the vent. 
The distance between the vent and the root of the ventral is two-fifths of the length of 
the head. 
178. Heros Moracuensis. (Plate LX XVII. fig. 2.) 
D. A.gy L. lat. 32. L. transv. 5/13. 
i0° = 
The fold of the lower lip is continuous in the middle. Snout pointed, with the lower 
jaw prominent. Prorbital with the antero-inferior margin but slightly concave, its 
greatest width being equal to that of the orbit. Dentition as in 1. dovit. Scales on 
the cheek small, in eight series. The first dorsal spine is inserted behind the vertical 
from the upper end of the gill-opening. Dorsal and anal spines short, the length of 
the twelfth of the dorsal fin being two-ninths of that of the head. Brownish, a black 
interrupted band runs from the eye to a spot on the root of the caudal, this spot being 
situated above the lateral line. An oblique short black streak runs from the lower 
posterior angle of the orbit towards a spot situated on the suture between operculum 
and suboperculum, close to the interoperculum, the band being not continuous with the 
spot. Back with traces of irregular cross bands, more distinct in young than in old 
individuals. Vertical fins with numerous brown dots. 
Five examples, from 4 to 10 inches long, were obtained by Mr. Godman from the Rio 
Motagua. This species is closely allied to H. friedrichsthalit. 
Description of an example 10 inches long.—The height of the body is nearly equal to 
the length of the head, and is contained thrice in the total length (without caudal); the 
length of the head is contained twice and five-sixths in the same. Head longer than 
