338 Fretp Museum or Naturat History — Zoéxroey, Vor. X. 
line at Gatun, at the “Spill-way,” which creates an artificial waterfall. 
We did not obtain it on the Pacific slope, although it is recorded from 
the Rio Mamoni. 
This fish is said to reach a length of one meter and is much valued as 
food. 
Habitat: Southern Mexico to Panama and Cuba. 
Family X. Cichlidee. 
THE MOojJArRAS. 
Body elongate, compressed, covered with ordinary scales, which are 
usually ctenoid; lateral line interrupted under soft portion of dorsal, 
reappearing lower down on caudal peduncle; mouth large or small, 
terminal to subinferior; teeth conical, incisor-like, or lobate; vomer and 
palatines without teeth; premaxillaries freely protractile; the maxillary 
usually slipping under the broad preorbital; nostril single on each side; 
dorsal fin single, the spinous portion usually longer than the soft portion; 
gill-membranes usually connected and free from the isthmus; air bladder 
prestnt; ventral fins I, 5, thoracic; anal fin with 3 or more spines, the 
soft portion smaller, though similar to that of dorsal; branchiostegals 
5 or 6; no pseudobranchize. 
A large family of fresh water fishes inhabiting the lowland streams of 
Mexico and the waters of Central and South America and Africa. Only 
a few species occur in Panama. 
KEY TO THE GENERA, 
a. Anal fin with 3 spines. 
b. First gill-arch normal, without a lamelliform lobe above angle; 
snout usually shorter than postorbital part of head. 
Aiquidens, p. 338. 
bb. First gill-arch with a lamelliform lobe above angle; snout much 
longer than postorbital part of head. Geophagus, p. 340. 
aa. Anal fin with more than 3 spines. 
c. Teeth all conical. Cichlasoma, p. 342. 
cc. The outer series of teeth in both jaws compressed, incisor-like. 
Neetroplus, p. 348. 
45. Genus Aquidens Eigenmann & Bray. 
Aiquidens Eigenmann & Bray, Ann. N. Y. Ac. Sci., VII, 1894, 616 (type 
Acara tetramerus Heckel). 
