30 ACANTHOPTEETair. 



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 Sjiecies. 



I. D. XV-XVII 10-12. A. V (VI 7) 8-9. Caudal peduncle § as long as 



deep 1. cyanoyuttatus. 



II. D. XVI-XVII 13. A. V 10. Caudal peduncle as long, or nearly as long, as deep. 

 Last dorsal spine more than i the length of head ; diameter of eye 3f in the 



length of head (in a specimen of 182 mm.) 2. hocourti. 



Last dorsal spine less than i the length of head ; diameter of eye 4 in the 



length of head (in a specimen of 126 mm.) 3. underwoodi. 



III. D. XVI-XVIII 11-12. A. VI-VII 9-10. Caudal peduncle i to f as 



long as deep 4. geddesi. 



1. Herichthys Cyanoguttatus, Baird & Girard, 1854. 

 Herichthijs cyanoguttatus, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 434. 



Hah. NoRTH-KASTEKN MEXICO, Nuevo Leon, Tamaulipas, and San Luis Potosi, extending 

 into Texas. 



2. Herichthys bocourti, Vaill. & Pellegrin, 1902. 

 Herichtliiis hocourti, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 435. 



Hah. GuATEMAL.\, Lake [Yzabal] Isabel. 



3. Herichthys underwoodi, sp. n. (Tab, III. fig. 5.) 



Depth of body 2| in the length, length of head .31. Snout nearly as long as postorbital part of head. 

 Diameter of eye 4 in the length of head, interorbital width 2|. Depth of prtcorbital slightly more than 

 the diameter of eye. Jaws equal anteriorly ; maxillary extending to between nostril and eye ; fold of the 

 lower hp not continuous ; check with 5 series of scales ; 8 gill-rakers on the lower part of anterior arch. 

 Scales 32 -^,, 3| between lateral line and anterior part of soft dorsal. Dorsal XVII 13, commeucino- 

 above the extremity of operculum, the spines subequal from the fourth to the fourteenth, thence inereasinc 

 in length to the last, which is less than i the length of head ; soft fin, when laid back, extending a little 

 beyond the base of caudal. Anal V 10. Veutrals extending to the vent. Caudal rounded. Caudal 

 peduncle as long as deep. Body with 6 dark cross-bars; vertical fins with small dark spots. 



Hah. Costa Kica (C. F. Undenvood). 



A single specimen, 126 mm. in total length. 



4. Herichthys geddesi, Regan, 1906. (Tab. III. fig. 4.) 

 Htrichtlnjs geddcd, Regan, Ann. ]\Iag. N. H. (7) xvi. 1905, p. 436. 



Hah. iSouTiiERN Mexico {Geddes). 



