DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 445 
Upper lip thick. The maxillary extends to the vertical from the anterior margin of 
the eye. The interorbital space is convex. ‘The anterior dorsal commences nearer to 
the end of the snout than to the base of the caudal fin. 
This species, of which we have given a full description (J. ¢.), occurs in rivers of both 
sides of the Isthmus and of Guatemala. The specimens named Dajaus elongatus are 
probably emaciated, caught after spawning-time. 
125. AGONOSTOMA MoNTICOLA (Bancroft). 
This species, which is indigenous in Jamaica and Barbadoes, has been found by 
M. Sallé in Mexico; and Messrs. Kner & Steindachner enumerate it in a collection 
from Panama, where it is found in rivers of both sides of the Isthmus. Abhandl. bayer. 
Ak. Wiss. 1865, p. 8. 
129. GoBIESOX RHODOSPILUS. 
Giinth. Proc. Zool. Soc. 1864, p. 25. 
IDbGs Algae Cet ee ali 
A vertical fold of the skin along the lower half of the base of the pectoral; the 
coracoid is scarcely below the level of the upper margin of the pectoral. The distance 
of the origin of the dorsal fin from the caudal is contained twice and two-thirds in its 
distance from the snout; the anal commences below the third dorsal ray. A very 
narrow band of short conical teeth in the upper jaw—one of the lateral teeth being 
somewhat larger than the others, recurved, canine-like. The lower jaw with a single 
series of teeth, the anterior being narrow incisors, whilst the outermost on each side is 
distinctly a canine tooth, corresponding to that in the upper jaw. Rose-coloured, with 
dark-rose transverse spots, each spot having an edge of deep-red dots. 
Two specimens, 18 lines long, were collected by Capt. Dow at Panama. 
132. POMACENTRUS RECTIFRENUM. 
A species from California and the western coast of Central America was described 
by Mr. Gill under this name in the year 1862, and easily recognized by myself when 
I gave an account of this genus in the fourth volume of my ‘ Fishes,’ having received, 
beside numerous examples from Panama and the Island of Cardon, a typical specimen 
from the collection of the Smithsonian Institution. At the same time a specimen was 
received from the same establishment, numbered as the other, but marked in the 
accompanying list as Pomacentrus bairdii, another name proposed by Mr. Gill in the same 
year (Proc. Ac. Nat. Sc. Philad. 1862, p. 149). It agreed perfectly with the descrip- 
tion given there; but as a comparison with our other examples of P. rectifrenum did 
not reveal distinctive specific characters, I did not hesitate to regard it not only as a 
typical specimen of Mr. Gill’s P. bairdii, but also as specifically identical with reeti- 
frenum ; about this I had no doubt. 
However, during the publication of my account of the Pomacentride, Myr. Gill 
kindly sent me a MS. communication on the same subject, in which he pointed out the 
