322 Mr. C. T. Regan on the Fishes of (he 



Snout longer than postorbital pai't of head. Diameter of eye 

 3.V in the length of head and equal to the interorhital width. 

 Depth of praiorbital equal to diameter of eye. Maxillary not 

 extending to below the eye ; praeraaxillary processes extending 

 to above anterior margin of eye ; jaws equal anteriorly ; fold 

 of the lower lip continuous or not ; cheek with 4 or 5 series 

 of scales ; 10 gill-rakers on the lower part of anterior arch. 

 Scales 28-29 J§, 1^- or 2 between lateral line and base of 

 anterior rays of soft dorsal. Dorsal XV 9-10^ commencing 

 above or behind axil of pectoral, the spines subequal from the 

 filth, the last r the length of head or less ; the soft fin, when 

 laid back, extending to anterior i of caudal. Anal YI-VII 

 7-8. Pectoral f the length of head, extending to above 

 origin of anal ; ventral extending beyond origin of anal. 

 Caudal slightly emarginate, with pointed lobes. Caudal 

 peduncle as long as deep. Brownish, with faint traces of 

 darker cross-bars and with a dark blotch on the lateral line 

 below the last dorsal spines ; small light blue spots on the 

 head and at the base of each scale on the body ; fins, except 

 the pectoral, dusky. 



San Domingo de Guzman, Mexico. 



1-2. (93 aud 100 mm.) San Domingo de Guzman. Dr. A. C. Biiller. 

 types of the species. 



Section 12 (fferos). 



Bodv deep. Scales of the lateral line of the same size as 

 those below it, but rather larger than those above it ; scales 

 of thoracic region considerably smaller than those on the side 

 of the bcdy. Mouth rather small, moderately protractile ; 

 maxillary slightly exposed ; teeth of the outer series moderate, 

 distinctly increasing in size anteriorly. Dorsal XV-XVII 

 13-14, the soft fin scaly at the base. Anal VII-VIII 12-14. 

 Pectoral extending beyond origin of anal. Caudal sub- 

 truncate. 



The single species, from Brazil and Guiana, is probably 

 derived from the type represented by C. fucetvm. It leads 

 to the genera Symphysodon and Pterophyllum. 



46. Cichlosoma severum. 



Heros severus, Heck. Ann. Mus. Wien, ii. 1840, p. 362. 



Ileros coryphcms, Heck. t. c. p. 304. 



Keros tnodestus, Heck. t. c. p. 366. 



Ileros stmrius, Heck. t. c. p. 3e8 ; Giinth. Cat. Fish. iv. p. 293 (1862) ; 



Pellegr. Mem. Sec. Zool. France, xvi. 1903, p. 230 (1904). 

 Ileros efasciatus, IKck. t. c. p. 372; Giinth. t. c. p. 294., 

 Chromys appendkuluta, Casteln. Anim. Am. Sud, Poiss. p. l-j, ])1. vii. 



tig. 3 (l«u5). 



