1864. ] DR. A. GUNTHER ON GUATEMALAN FISHES. 149 
the caudal is included. The depth of the head is contained once 
and three-fourths in its length. Snout long; the diameter of the 
eye is two-fifths of the length of the snout, and one-fourth of the 
_postorbital part of the head. Symphysial barbel very short, as long 
as the posterior nostril. Preeoperculum without distinct serrature. 
The length of the second dorsal spine is one-half of that of the head. 
Posterior margin of the caudal fshaped, the upper lobe being 
pointed, the lower rounded ; anal spine very feeble. The maxillary 
extends to the vertical from the anterior margin of the orbit. Upper 
parts blackish, shining silvery, the lower white. 
One specimen, 17 inches long, was found by Mr. Salvin at Chia- 
pam. 
MICROPOGON ALTIPINNIS. 
D. 10/5. A. 2/7. L, lat. 48-50. L. transy. 7/15. 
The height of the body is contained thrice and two-thirds in the 
total length (without caudal) ; the length of the head thrice and a 
half. The maxillary extends scarcely beyond the vertical from the 
anterior margin of the eye. A series of five minute barbels along 
each side of the mental groove. Two short, strong, divergent spines 
at the angle of the preoperculum. The third and fourth dorsal 
spines are long, their length being three-fifths of that of the head ; 
anal spine of moderate strength, not quite one-fourth of the length 
of the head. Nearly uniform silvery. 
Two specimens were procured by Mr. Salvin—one, 17 inches long, 
at Chiapam, and another, 14 inches long, at San José. 
OTOLITHUS ALBUS. 
D. 10/5. A. 2/9. 
Scales rather irregularly arranged ; there are seven series between 
the origin of the dorsal fin and the lateral line. The height of the 
body is one-fourth of the total length (without caudal), the length 
of the head two-sevenths. The extent of the snout is one-fourth of 
the length of the head; the maxillary extends somewhat beyond the 
vertical from the posterior margin of the eye. Preeopercular angle 
not produced behind. The spinous dorsal is much longer than high ; 
its spines are feeble, the length of the fourth being two-fifths of that 
of the head. Caudal fin rounded, with the middle rays produced. 
The second anal spine is truly spinous, not flexible, two-fifths of the 
length of the first soft ray. The pectoral fin extends as far back- 
wards as the ventral, being more than half as long as the head. 
Immaculate, silvery, back greenish. (Pseudobranchize present. ) 
One specimen, 143 inches long, was obtained by Mr. Salvin at 
Chiapam. 
OTOLITAUS RETICULATUS. 
D. 10|5-5. A. 11(2/9). 
Closely allied to O. carolinensis. Scales rather irregularly ar- 
