152 DR. A. GUNTHER ON GUATEMALAN FISHES. [Mar. 22, 
GERRES AXILLARIS. 
D. 9|10. A. 3/8. L. lat. 34. L. transv. 5/10. 
Allied to G. plumieri, but with considerably shorter fin-spines. 
The height of the body is contained twice and a fourth in the total 
length (without caudal). Preorbital finely serrated. Snout as 
long as the eye; the groove for the intermaxillary processes is very 
broad, scaleless, extending backwards to the vertical from the centre 
of the eye. Dorsal fin notched, the last spine being not much longer 
than the eye; dorsal spines strong, the second as long as the head 
without snout ; the second anal spine stronger, but scarcely longer 
than the second of the dorsal fin. The pectoral extends to the ver- 
tical from the third anal spine. Caudal deeply forked, with the 
lobes equal in length to each other and to the pectoral. A blackish 
streak along each series of scales; the hinder side of the axil, and 
sometimes the anterior, blackish. 
Three specimens, from 8 to 9 inches long, were collected by Mr. 
Salvin at Chiapam. 
GERRES BREVIMANUS. 
D. 910. A. 3/8. L. lat. 39. Lz. transy. 6/11. 
Preorbital minutely serrated. The height of the body is contained 
twice and two-fifths in the total length (without caudal) ; the length 
of the head twice and a half. Snout as long as the eye; the groove 
for the intermaxillary processes is broad, scaleless, not extending 
backwards to the vertical from the centre of the eye. Dorsal fin 
notched, the last spine being longer than the eye; dorsal spines 
strong, the length of the second equals the distance between the end 
of the operculum and the anterior nostril; the second anal spine 
stronger, but much shorter, than the second of the dorsal fin. The 
scaly sheath of the anal fin leaves the outer half of the last ray un- 
covered. The pectoral extends scarcely to the vertical from the 
vent. Caudal scaly, deeply forked, with the lobes equal in length, 
each being one-fourth of the total. Three or four blackish streaks 
along the series of scales below the lateral line ; the spinous dorsal 
fin black. 
One specimen, 10 inches long, was found by Mr. Salvin at Chiapam. 
HEROS GUTTULATUS. 
D. iw. A. 3 L. lat. 33. L. transv. = 
The fold of the lower lip is interrupted in the middle. The height 
of the body is contained twice and three-fifths in the total length 
(without caudal) ; the length of the head thrice and a fifth. The 
upper profile of the head descending in a gentle curve. Scales on 
the cheek in four series. The first dorsal spine is inserted behind 
the vertical from the upper end of the gill-opening. Dorsal spines 
rather feeble, the length of the twelfth being two-sevenths of that 
of the head. Pectoral two-thirds as long as the head. Upper parts 
blackish, each scale with a black base; lower parts reddish, with a 
