450 DR. GUNTHER ON THE FISHES OF CENTEAL AMEEICA. 



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. ~ry A. g^) appear to be very constant. 



158. Heeos makgabitifer. (Plate LXXI. fig. 2.) 

 (Junth. Fish. iv. p. 287. 



D. |{. A. I. 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). Bro\vnish olive, with seven black cross bands, each band with 

 pearl-coloiu'ed spots. 



One specimen, 6^ inches long, was found by Mr. Salvin at Lake Peten. 



159. Heeos melanopogon. 

 Steindachner, Denkschr. Ak. Wiss. Wien, xxiii. p. 72, Taf. 1. fig. 3. 



D. i^. A. I L. lat. 30. L. transv. 6i/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 in-egular 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 ai-e 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, appeai-s to have visited Lake Peten, 

 which is inhabited by //. margaritifer. 



160. Heros mel.\nueus. (Plate LXXII. fig. 3.) 

 (Jiinth. Fish. iv. p. 288. 



D. ^. A. t L. lat. 33. L. transv. 5/13. 



The fold of the lower lip is subinterrupted in the middle ' ; five seiies ot 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 I^ake 

 Peten. 



' l^he fold is distinctly interrupted in specimens from to 10 inches long, whilst it appears to be slightly 

 continuous in young individuals of 3 to 4 inches long. 



