30 ACANTHOPTERYGII. 
5. HERICHTHYS, Baird & Girard, 1854. 
Herichthys, Regan, Ann. Mag. Nat. Hist. (7) xvi. 1905, p. 434. 
Differs from Cichlosoma only in the dentition, the enlarged outer series of teeth 
being compressed. The four species inhabit Mexico and Central America, one 
ranging into Texas, the northern limit of the family. 
Synopsis of the Species. 
TI. D. XV-XVII 10-12. A.V (VI7) 8-9. Caudal peduncle 2 as long as 
deep... . . + 1. cyanoguttatus. 
Il. D. XVI-XVII 13. “A. Vv 10. Caudal peduncle 2 as long, or nearly as long, as deep. 
Last dorsal spine more than 3 the length of head; diameter of eye 33 in the 
length of head (in a specimen of 182 mm.) . . . + « « 2 bocourti. 
Last dorsal spine less than 4 the length of head ; diameter of. eye 4 in the 
length of head (in a specimen of 126mm.) .. . oe . . & underwoodi. 
III. D. XVI-XVITI 11-12. A. VI-VII 9-10. Caudal peduncle 4 4 to 2 
long as deep . 2. ew ew ee ee ee ee ee eee A gee si. 
1. Herichthys cyanoguttatus, Baird & Girard, 1854. 
Herichthys cyanoguttatus, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 434. 
Hab. NortH-EasterN Mexico, Nuevo Leon, Tamaulipas, and San Luis Potosi, extending 
into Texas. 
2. Herichthys bocourti, Vaill. & Pellegrin, 1902. 
Herichthys bocourti, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 435. 
Hab. Guaremata, Lake [Yzabal] Isabel. 
3. Herichthys underwoodi, sp. n. (Tab, III. fig. 5.) 
Depth of body 22 in the length, length of head 3}. Snout nearly as long as postorbital part of head. 
Diameter of eye 4 in the length of head, interorbital width 23. Depth of preorbital slightly more than 
the diameter of eye. Jaws equal anteriorly; maxillary extending to between nostril and eye; fold of the 
lower lip not continuous ; cheek with 5 series of scales ; 8 gill-rakers on the lower part of anterior arch. 
Seales 32 a 33 between lateral line and anterior part of soft dorsal. Dorsal XVII 13, commencing 
above the extremity of operculum, the spines subequal from the fourth to the fourteenth, thence increasing 
in length to the last, which is less than 4 the length of head; soft fin, when laid back, extending a little 
beyond the base of caudal. Anal V 10. Ventrals extending to the vent. Caudal rounded. Caudal 
peduncle as long as deep. Body with 6 dark cross-bars; vertical fins with small dark spots. 
Hab. Costa Rica (C.F. Underwood). 
A single specimen, 126 mm. in total length. 
4. Herichthys geddesi, Regan, 1905. (Tab. III. fig. 4.) 
Herichthys geddesi, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 436. 
Hab. Sournern Mexico (Geddes). 
