26 ACANTHOPTERYGII. 
37. Cichlosoma labiatum, Giinth., 1864. 
Cichlosoma labiatum, Regan, Aun. Mag. N. H. (7) xvi. 1905, p. 319. 
Hab. Laxes Manacua and Nicaracua (Dow). 
Section 4. THoricutuys, Meek, 1904. 
Very similar to Astatheros in form and dentition, but with the dorsal and anal fins entirely scaleless and the 
caudal truncate or slightly emarginate, usually with pointed lobes. Dorsal XV-XVIT 8-12. Anal VI- 
IX 6-9. 9 to 12 gill-rakers on the lower part of the anterior arch. The coloration of the three species 
of this group may be described thus :—About six dark cross-bars, the third bearing a blackish blotch on 
or below the lateral line; suboperculum usually blackish; head and anterior part of body with blue 
spots; vertical fins dusky, usually with light spots. 
Synopsis of the Species. 
Pectoral extending to above origin of anal . . 1. 1 ee ee ee ee 88. Callolepis. 
Pectoral extending to above middle anal spines . . 2... ew ee + + +) 89. aureum. 
Pectoral extending to first branched ray of anal. . . . . ee + ee ee 40. affine. 
38. Cichlosoma callolepis, Regan, 1904. (Tab. II. fig. 2.) 
Cichlosoma callolepis, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 321. 
Hab. Mexico, San Domingo de Guzman (Buller). 
39. Cichlosoma aureum, Giinth., 1862. 
Cichlosoma aureum, Regan, Aun. Mag. N. H. (7) xvi. 1905, p. 320. 
Hab. Sovrurrn Mexico, Rio Papaloapam (Gadow, Meek), San Domingo de Guzman 
and Rio de Sarabia (Buller) ; Guaremaua, Lake Yzabal and Rio Motagua (Salvin). 
40. Cichlosoma affine, Giinth., 1862. 
Cichlosoma affine, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 321. 
Hab. GuateMata, Lake Peten (Salvin). 
Section 5. PaRAPETENIA, Regan, 1900. 
The anterior pair of teeth in the upper jaw and the two on each side of the anterior pair in the lower are more 
or less strongly enlarged and canine-like. The mouth is usually larger, more oblique and more pro- 
tractile than in other groups of Cichlosoma, the length of the lower jaw or of the preemaxillary spines, 
from the anterior edge of the upper jaw, measuring from 2 to a little more than 2 the length of the head. 
The upper profile of the snout is straight; the fold of the lower lip is continuous or subcontinuous. The 
dorsal fin has XV-XVIII 8-18 rays and posteriorly has a scaly sheath at the base and a short series of 
scales on each interradial membrane; the anal has IV-IX 7-10 rays; the pectoral is shorter than the 
head; the caudal is rounded. 
In addition to the thirteen species from Mexico and Central America, there are two, 
the most generalized of the group, C. tetracanthus and C. adsperswm, from Cuba and 
