DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 425 
54. LARIMUS BREVICEPS. 
Larimus breviceps, Cuv. & Val. v. p. 146, pl. 111. Giinth. Fish. ii. p. 268. 
Amblyscion argenteus, Gill, Proc. Ac. Nat. Sc. Philad. 1864, p. 165. 
Having recently received a fine example of this fish from Panama through Capt. Dow, 
I have convinced myself that the Pacific examples are not specifically, much less 
generically, distinct from West-Indian ones. 
56. MIcROPOGON ALTIPINNIS. 
Giinth. Proc. Zool. Soc. 1864, p. 149. 
D.10|5. A. 2/7. L lat. 48-50.. L. transv. 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; a third specimen, 43 inches long, was found by 
Capt. Dow at Panama: this agrees in every other respect with the older examples, but 
of the minute barbels only a trace of the anterior (longest) pair is visible; so that it 
appears that this generic (!) character is developed with age. 
57. UmBRINA ELoNGATA. (Pl. LXIV. fig. 2.) 
Ginth. Proc. Zool. Soc. 1864, p. 148. 
D.10|%- A. 1/7. L. lat. 70. L. transv. 7/22. 
The height of the body is contained four times and a third in the total length (without 
caudal), and five times if the caudal is included ; the length of the head is two-sevenths 
of the total, or one-fourth if 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. Sym 
physial 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 f-shaped, 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 Chiapam. 
VOL. VI.—PART VII. 3.N 
