1864. ] DR. A. GUNTHER ON GUATEMALAN FISHES. 153 
broad blackish band from behind the pectoral to the base of the 
caudal; many scales within or below the band with a black spot in 
the upper or lower angle; each scale on the side of the head with a 
black spot ; chin and throat violet. The spinous dorsal black, with 
yellowish margin ; the soft parts of the vertical fins with blackish 
spots. 
Pine specimen, 6 inches long, was collected by Mr. Salvin on the 
Pacific coast of Guatemala. 
HEROS MACRACANTHUS, 
14—15 5 52 
D. Ss «(As aL Jat. 31. L. transv. 2. 
The lower lip is interrupted in the middle. The height of the 
body is two-thirds of the total length (without caudal) in adult spe- 
cimens, but only one-half in immature; the length of the head is 
one-third of the total. Upper profile of the head very steep, not 
concave. Scales on the cheek in five series. The first dorsal spine 
is a little before the vertical from the upper end of the gill-opening. 
Dorsal and anal spines strong, the tenth of the dorsal fin being two- 
fifths of the length of the head. Pectoral as long as the head. 
Dark greenish, many scales with a pearl-coloured spot in the upper 
or lower angle. Vertical and ventral fins black. Immature speci- 
mens with six very indistinct dark cross bands, the third of which 
has a blackish blotch below the lateral line ; an indistinct blackish 
spot at the root of the caudal fin. 
About a dozen specimens, from 3 to 9 inches long, were collected 
by Mr. Salvin at Chiapam and Huamuchal. 
HEROS CiITRINELLUS. 
D. “3%, A. =o. LL. lat. 30. L. transv. 6/13. 
The fold of the lower lip is continuous in the middle. The height 
of the body is contained twice and a fifth in the total length (without 
caudal); the length of the head twice and seven-eighths ; nape of 
the neck very convex ; interorbital space broad, its width being two- 
fifths of the length of the head. Snout not obtuse; scales on the 
cheek in four series. The first dorsal spine is inserted above the 
upper end of the gill-opening. Dorsal and anal spines slender, the 
tenth of the dorsal fin being two-fifths of the length of the head. 
Pectoral nearly as long as the head. Lemon-coloured, either nearly 
uniform or with the back black, which colour sometimes forms irre- 
gular blotches on the vertical fins. 
Three specimens, from 7 to 8 inches long, were collected by Capt. 
Dow in the Lake of Nicaragua. 
HEROS NICARAGUENSIS. 
Df. AZ L. lat. 35.  L. transy. 5/13. 
The fold of the lower lip is interrupted in the middle. The height 
of the body is contained twice and two-fifths in the total length 
