22 ACANTHOPTERYGILI. 
18. Cichlosoma lentiginosum, Steind., 1864. 
Cichlosoma lentiginosum, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 237. 
Hab. “ Mexico.” 
Probably an inhabitant of Southern Mexico. 
19. Cichlosoma balteatum, Gill & Bransf., 1877. (Tab. II. fig. 1.) 
Cichlosoma balteatum, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 238. 
Hab. Lake NICARAGUA. 
20. Cichlosoma nicaraguense, Ginth., 1864. 
Yichlosoma nicaraguense, Regan, Ann. Mag. N. H. (7) xvi. 1905, p. 238. 
Hab. Lake NIcARAGUA. 
Section 2. ArcHocentTRUS, Gill, 1877. 
Very closely allied to Theraps, but with the anterior pair of teeth of the outer series in the upper jaw often 
somewhat enlarged, with a longer pectoral and more numerous anal spines. The group may be thus 
defined :—Body rather deep (depth 13 to 24 in the length, caudal peduncle 4 to § as long as deep) ; mouth 
rather small, moderately protractile (maxillary not extending beyond the vertical from anterior margin of 
eye, premaxillary spines extending to just above the anterior margin of eye). D. XVII-XIX 7-10, the 
soft fin scaly at the base. A. VIII-XII 6-9. Pectoral extending beyond the origin of anal; caudal 
rounded or subtruncate. 
Six species, from Southern Mexico, British Honduras, Guatemala, and Nicaragua. 
Synopsis of the Species. 
I. 6 to 8 gill-rakers on the lower part of anterior arch. 
A. Maxillary extending to the vertical from anterior margin of eye. 
D. XVII-XVIII 8-9. A. VITI-X 6-8. 2 or 24 scales between lateral line 
and base of anterior part of soft dorsal . . . . . . . . 2). + Ql. nigrofasciatum. 
D. XVII-XIX 8-10. A VIII-X 7-8. 8} or 4 scales between lateral line 
and base of anterior part of soft dorsal . . . 2. 1. 1. 1. es + 22. octofasciaium. 
B. Maxillary not extending to the vertical from anterior margin of eye. 
a. Pectoral as long as or a little longer than the head. D. XVIII- 
XIX 9-10. A. VITI-X 7-8 2. 2... 1. 1 ww ee. 28. spilurum. 
b. Pectoral # the length of head. 
D. XVITI-XTX 9-10. A-IX9 . 2... . 1 ee ww. 24. tmmaculatum. 
D. XVITI-XIX 7-8. A. XI-XIIT7-8 . 2... ww ww. 25. spinosissomum. 
II. 15 gill-rakers on the lower part of the anterior arch. D. XVI 8-9. 
A. X-XI18-9 . 2... 2 we ek ew. 26. centrarchus. 
21. Cichlosoma nigrofasciatum, Gimth., 1869. 
Cichlosoma nigrofasciatum, Regan, Aun. Mag. N. H. (7) xvi. 1905, p. 75. 
Hab, GuatemaLa, Lakes Amatitlan and Atitlan (Salvin). 
