Dec. 28, 1916. FisHes of PANAMA— MEEK AND HILDEBRAND. 333 
lateral line usually absent, never complete; scales large, extending 
forward on head; dorsal fins 2, well separated, the first composed of 4 
rather strong spines; second dorsal with one spine and from 7 to ro soft 
rays; caudal fin forked; anal fin with 2 or 3 spines and 7 to 11 soft 
rays; ventral fins abdominal, each with one spine and 5 branched rays; 
pectoral fins placed high. 
The genera Agonostomus and Joturus comprise fresh water species 
and are dealt with in the present paper. The marine species of this 
family will be discussed in another work. 
KEY TO THE GENERA, 
a. Snout scarcely in advance of upper lip; teeth in lower jaw in a 
continuous band; dorsal spines rounded, not prominently com- 
pressed. Agonostomus, p. 333- 
aa. Snout projecting beyond upper lip; teeth in lower jaw in two 
lateral patches, not confluent anteriorly; dorsal spines notably 
compressed. Joturus, p. 336. 
43. Genus Agonostomus Bennett. 
Agonostomus Bennett, Proc. Comm. Zool. Soc., I, 1831, 166 (type 
Agonostomus telfairtt Bennett). 
Neomugil Valliant, Bull. Soc. Philom, Paris, IV, 1894, 73 (type Neomugil 
digueti Valliant.) 
Body elongate, compressed; mouth terminal in young, subinferior 
in adult, the cleft extending laterally to or past front of eye, the lower 
lip not greatly thickened; teeth in bands on jaws, vomer and palatines, 
those on jaws with lance-shaped apices or serrated margins; first dorsal 
with 4 rounded spines;-.anal spines 2, the first one minute, often hidden 
in the skin; stomach not gizzard-shaped. Inhabiting tropical rivers, 
some of them living in mountain torrents. 
The American species of this genus have been described in current 
works as having pointed teeth in the jaws. This is certainly not true 
of the specimens at hand, either from Panama or Cuba. The outer 
series in each jaw is mostly composed of lance-shaped teeth and the 
inner ones nearly all have a serrated margin. 
KEY TO THE SPECIES. 
a. Body comparatively slender, the depth 3.7 to 3.85 in its length 
in specimens about 150 mm. long; mouth rather small, the maxil- 
lary reaching to or slightly past vertical from anterior margin of 
eye. monticola, p. 334. 
