450 DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 
of the tail; the height of the body is contained from once and three-fifths to twice and 
one-fifth in the total length. Guatemalan specimens have generally the black caudal 
blotch, but they vary much in the depth of the body. The numbers of the fin-rays 
(D. was A. s) appear to be very constant. 
158. Heros MARGARITIFER. (Plate LXXI. fig. 2.) 
Giinth. Fish. iv. p. 287. 
D.%. AZ L. lat. 31. L. transv. 5/13. 
The fold of the lower lip is slightly interrupted in the middle; five or six series of 
scales on the cheek. The height of the body is rather less than one-half of the total 
length (without caudal). Brownish olive, with seven black cross bands, each band with 
pearl-coloured spots. 
One specimen, 64 inches long, was found by Mr. Salvin at Lake Peten. 
159. HEROS MELANOPOGON. 
Steindachner, Denkschr. Ak. Wiss. Wien, xxiii. p. 72, Taf. 1. fig. 3. 
D: 32 A. S$. Le lat. 30.’ L. transv. 64/13. 
The fold of the lower lip is interrupted in the middle; five or six series of scales on 
the cheek. The height of the body is four-ninths of the total length (without caudal). 
Body with five irregular blackish cross bands interrupted in the middle, so as to repre- 
sent two series of irregular blotches ; a large blackish blotch on the root of the caudal 
fin. Small pearl-coloured spots surround the lower blotches, and are scattered over the 
caudal blotch. 
Known from a specimen 4} inches long. 
This fish may represent merely the younger state of H. margaritifer; it is stated to 
be from Central America. It formed part of a collection made by Friedrichsthal, who, 
to judge from other specimens collected by him, appears to have visited Lake Peten, 
which is inhabited by H/. margaritifer. 
160. Heros MELANuRuS. (Plate LX XII. fig. 3.) 
Ginth. Fish. iv, p. 288. 
D. ALS. L, lat. 33. L. transv. 5/13. 
The fold of the lower lip is subinterrupted in the middle’; five series of scales on the 
cheek. The height of the body is contained twice and a third or twice and a half in the 
total length (without caudal). A deep-black band along the middle of the tail; the 
lower parts black in adult specimens. 
Several examples, from 3 to 10 inches long, were collected by Mr. Salvin at Lake 
Peten. 
’ The fold is distinetly interrupted in specimens from 6 to 10 inches long, whilst it appears to be slightly 
continuous in young individuals of 3 to 4 inches long. 
