os 
DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 45 
between the anterior dorsal spines and the lateral line. 'The following are subvertical, 
slightly inclined backwards, and broader than the imterspaces between them. The 
penultimate connects the ends of the dorsal and anal fins; the last across the root of 
the caudal. Fins black. 
This species appears to remain within small dimensions. 
164. Heros MULTISPINosUS. (Plate LX-XIV. fig. 2.) 
D.G- A. 7 L. lat. 29. L. transv: 4/12. 
The lower lip is interrupted in the middle. Three series of scales on the cheek. A 
blackish band, interrupted on the tail, runs from the eye to the caudal; a round black 
spot in the middle of the length of the band. 
A single specimen, 34 inches long, was obtained by Capt. Dow in the Lake of 
Managua. 
Description.—tThe height of the body is contained twice and one-seventh in the total 
length (without caudal), the length of the head thrice. ‘The free portion of the tail is 
twice as deep as long. Head as deep as long, with the upper profile nearly straight. 
Snout rather short; the width of the preorbital being considerably less than that of the 
orbit. The eye is situated immediately below the upper profile, nearer to the end of 
the snout than to that of the operculum; its diameter is a little less than one-third of 
the length of the head, and much less than the width of the interorbital space, which 
is flat. Mouth with the jaws equal in length, small, the maxillary not nearly reaching 
the vertical from the orbit. Suboperculum with two series of scales. The soft dorsal 
and anal fins are scaly at the base, they are scarcely prolonged, and not extending to 
the middle of the caudal. The dorsal fin commences above the humerus ; its spines are 
of moderate strength, and rather long, the length of the eighth to the last spine being 
not much less than one-half of that of the head. Anal spines stronger, and even a 
little longer than those of the dorsal. Caudal fin rounded, two-ninths of the total 
length. Pectoral shorter than the head, extending to the fifth anal spine. The outer 
ventral ray produced into a. short filament. Brownish olive, each scale somewhat 
darker at the base. A blackish band, as broad’as a scale, runs from the eye to a round 
black spot situated before and below the termination of the upper part of the lateral 
line; thence it is continued to the root of the caudal as a series of four or five regular 
spots. Fins blackish, apparently immaculate. 
165. Heros toncimanus. (Plate LX XII. fig. 2.) 
D. = A. 4 L. lat. 28... L. transv. 43/12. 
The fold of the lower lip is interrupted in the middle. ‘Three or four series of scales 
on the cheek. Pectoral very long, extending nearly to the end of the anal. Greenish 
