476 DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 
hesitate to refer our specimens to it, if the barbels of Bleeker’s species were not much 
longer, those of the maxillaries extending on to the base of the ventral fin, and the 
outer ones of the mandible to the base of the pectoral. The specimen in the Leyden 
Museum is 83 inches long. 
219. ARIUS DOVII. 
Mr. Gill (Proc. Acad. Nat. Sc. Philad. 1863, p. 170) describes a species discovered 
by Capt. Dow on the Pacific coast of Central America, under the name of Leptarius 
dowii. Leptarius is a distinct genus, according to Mr. Gill, characterized by having 
the band of teeth quadripartite, the head granulated and without lateral fontanelles, a 
slender body, and a very slender caudal peduncle, the anal fin rather low and oblong, 
the thin adipose fin extending behind the anal, and the fins little developed.—The 
species is not described; but detailed comparative measurements of the single example 
(which is 5? inches long) are given. 
222. ARLURICHTHYS NUCHALIS. (Plate LXXXI. fig. 2.) 
Ginth. Fish. v. p. 179. 
Avie. As 20s, ee L/L. 
The height of the body is rather less than the length of the head, which is two-ninths 
of the total (without caudal); the greatest width of the head is three-fourths of its 
length ; snout longer than the eye, the diameter of which is rather less than one-fourth 
of the length of the head. The vomerine band of teeth is separated in the middle by a 
short interspace, each half being as broad, and long as the palatine band, with which it 
is subcontinuous. ‘The maxillary barbels extend to the root of the ventral, those of the 
mandible nearly to the pectoral. The dorsal buckler is as broad behind as in front, 
with rounded lateral margins, each half being bent downwards on the side. Dorsal fin 
narrow and elevated, the first ray being considerably longer than the spine, which is as 
long as the head without snout; pectoral spine equal to the dorsal spine. The origin 
of the anal fin is much nearer to the base of the caudal than to that of the pectoral. 
‘The first pectoral ray is produced into a long filament reaching beyond the origin of the 
anal. Ventrals extending beyond the vent, their length being three-fifths of that of the 
head. Iridescent blue above, silvery below. 
One example, 11 inches long, was obtained by Messrs. Salvin and Dow on the Pacific 
coast of Panama. 
223. ASLURICHTHYS PANAMENSIS. 
Gill, Proc. Ac. Nat. Se. Philad. 1863, p. 172. 
This species is described thus :— 
1D Yael mone iiee eter Ulla 
The greatest height is contained five times in the length to the base of the caudal fin, 
