144 DR. A. GUNTHER ON GUATEMALAN FisHEs. [Mar. 22, 
3. Report or A COLLECTION oF Fishes MADE BY Messrs. 
Dow, Gopman, AND SALVIN 1N GUATEMALA. By ALBERT 
Gintruer, M.A., M.D., Pu.D., F.Z.S. 
Part First. 
The following paper contains a report on a collection of fishes 
made by Messrs. Salvin and Godman during their travels in Guate- 
mala and in adjacent countries, in which they were assisted by Capt. 
Dow, a gentleman whose name is already familiar to all interested in 
ichthyology. I give at present diagnoses of those new species which are 
not included in the third, fourth, and fifth volumes of the ‘ Catalogue 
of Fishes.’ Full descriptions, with notes on the localities where the 
collections have been made, and with a complete list of the species 
collected, will be published in the ‘Transactions’ of this Society. 
CENTROPOMUS MEDIUS. 
A. 3/7. L. lat. 57. Eight longitudinal series of scales between 
the origin of the second dorsal fin and the lateral line. The height 
of the body is contained thrice and three-fourths in the total length 
(without caudal); the length of the head twice and four-fifths. 
Przeorbital finely serrated ; subopercnlum produced into a flap, which 
does not extend to the vertical from the origin of the dorsal fin. 
The intermaxillary extends somewhat beyond the anterior margin of 
the orbit. Dorsal spines strong ; the third is longer than the fourth, 
and half as long as the head. The second anal spine long, but a 
little shorter than the third, and equal in length to the distance be- 
tween the extremity of the upper jaw and the preeopercular margin. 
The length of the ventral fin is much more than one-half of its dis- 
tance from the anal fin. Lateral line black. 
Two specimens, 13 inches long, from Chiapam. 
CrNTROPOMUS NIGRESCENS. 
A. 3/6. L. lat. 70. Ten longitudinal séries of scales between 
the origin of the second dorsal fin and the lateral line. The height 
of the body is contained four times and a half in the total length 
(without caudal); the length of the head twice and four-fifths. 
Preorbital not serrated; suboperculum produced into a short flap, 
which does not extend to the vertical from the origin of the dorsal 
fin. The intermaxillary extends a little beyond the middle of the 
orbit. Dorsal spines rather feeble; the third and fourth are equal 
in length, two-fifths of the length of the head; the second and third 
anal spines also are equal in length, and not longer than the dorsal 
spines mentioned. The length of the ventral fin is scarcely more 
than one-half of the distance of its base from the anal. Air-bladder 
without appendages anteriorly. Silvery ; upper parts and fins black- 
ish; lateral line black. 
One specimen, 14 inches long, from Chiapam. 
This species is allied to C. appendiculatus, Poey, but differs ex- 
ternally in its considerably more feeble and shorter fin-spines. 
