22 ACANTHOPTEETGII. 



18. Cichlosoma lentiginosum, Steind., 1864. 



Cichlosoma lentiginosum, Regan, Ann. jMag. N. H. (7) xvi. 1905, p. 237. 

 Bah. "Mexico." 



Probably an inhabitant of Southern Mexico. 



19. Cichlosoma balteatum, Gill & Bransf., 1877. (Tab. II. fig. 1.) 



CichJosoma halteaium, Regan, Ann. ]\Iag. N. li. (7) xvi. 1905, p. 238. 



Hal). Lake Nicaragua. 



20. Cichlosoma nicaraguense, Gtinth., 1864. 



Cichlosoma nicaraguense, Regan, Aim. Mag. N. II. (7) xvi. 1905, p. 238. 

 Hah. Lake Nicaragua. 



vSection 2. Archocentrus, Gill, 1877. 



Very closely allied to Tlierajis, 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 maj' be thus 

 defined : — Body rather deep (depth I| to 2' in the length, caudal peduncle i to | as long as deep) ; mouth 

 rather small, moderately protractile (maxillary not extending beyond tho vertical from anterior margin oi 

 eye, priemaxillary 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 C-9. Pectoral extending beyond the origin of anal ; caudal 

 rounded or subfrunoatc. 



Six species, from Southern Mexico, British Honduras, Guatemala, and Nicaragua. 



Sijnopsis 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. XTII-XYIII 8-9. A. VIII-X G-8. 2 or 2l scales between lateral line 



and base of anterior part of soft dorsal 21. nigroj'asciatuni. 



D. XVII-XIX 8-10. A VIII-X 7-8. 3^ or 4 scales between lateral line 



and base of anterior pai . of soft dorsal 22. octofasciutuui. 



B. Maxillary not extending to tLe vertical from anterior margin of eye. 

 «. Pectoral as long as or a little longer than the bead. D. XVIII- 



XIX 9-10. A. VIII-X 7-8 23. spiluram. 



h. Pectoral f^ the length of liead. 



D. XVIII-XIX 9-10. A, IX 9 24.. immuculutnin. 



D. XVIII-^XIX 7-8. A. XI-XII 7-8 25. spinosissimum. 



II. 15 gill-rakers on tlic lower part of the anterior arch. D. XVI 8-9. 



A. X-XI 8-9 26. centrarchus. 



21. Cichlosoma nigrofasciatum, Gunth., 1869. 



CichJosoma nigrofasciatum, Regan, Ann. :Mag. N. H. (7) xvi. 1905, p. 75. 

 Hah. Guatemala, Lakes Amatitlan and Atitlan {Salvin). 



