146 DR. A. GUNTHER ON GUATEMALAN FISHES. [Mar. 22, 
brownish olive, each scale with a pearl-coloured spot, the spots 
forming together very distinct longitudinal stripes; no black lateral 
spot; hind part of the root of the pectoral brown. Lower parts 
salmon-coloured. 
We have four examples: two, 15 inches long, were collected by 
Mr. Salvin at Chiapam ; and two young ones were sent by Capt. 
Dow from the Pacific coast of Panama. 
PRisTIPOMA CHALCEUM. 
D. . A. =. L. lat. 56. L. transv. 11/19. 
The height of the body is contained twice and two-thirds in the 
total length (without caudal); the length of the head thrice and a 
third. The diameter of the eye is nearly equal to the width of the 
interorbital space, and two-thirds of the extent of the snout. The 
maxillary does not extend backwards to the vertical from the ante 
rior margin of the orbit. Preeoperculum minutely serrated behind, 
with the angle rounded, but not produced. There is no notch be- 
tween the spinous and soft portions of the dorsal fin, the hinder 
spines being ozly a little shorter than the anterior rays ; dorsal spies 
of moderate strength, the fourth being the longest, not quite half as 
long as the head; anal spines short, the second being only a little 
longer than the third, two-sevenths of the length of the head. 
Caudal fin subtruncated, scarcely emarginate. Dorsal and anal per- 
fectly scaleless. The pectoral fin extends to the vertical from the 
vent. Bronze-coloured, shining silvery, perfectly immaculate ; ver- 
tical fins blackish, with an indistinct light band along the base. 
One specimen, 8 inches long, was discovered by Messrs. Dow and 
Salvin on the Pacific coast of Panama. 
PRISTIPOMA MACRACANTHUM. 
D. 11/5. A. 3/8. L, lat. 47. L. transv. 6/13. 
The height of the body equals the length of the head, and is one- 
third of the total (without caudal). The diameter of the eye equals 
the width of the interorbital space, and is two-thirds, or somewhat 
less than two-thirds, of the extent of the snout. Hind margin of 
the anterior nostril with a broad flap. Snout somewhat produced ; 
the maxillary does not extend to below the anterior margin of the 
eye. Preoperculum with the hind margin rather concave, and with 
stronger teeth at the angle, which is rounded. The spinous and soft 
portions of the dorsal fin are separated by a deep notch, the spine 
of the soft portion being much longer than the preceding, which is 
somewhat longer than the second. Dorsal and anal spines exceed- 
ingly strong; the fourth dorsal spine is the longest, its length being 
contained twice and a third in that of the head. The second anal 
spine much longer and stronger than the third, and even than the 
fourth dorsal spine. Caudal fin truncated. Each soft ray of the 
vertical fins is accompanied by a series of minute scales. The pec- 
toral fin extends to the vent. Scales smooth. Silvery, with several 
