462 Mr. C. T. Regan on 



head. Diameter of eye 3^ to 4 in the length of head, inter- 

 orbital width 2| to 3. Depth of prteorbital equal to or less 

 than the diameter of eye. Jaws equal anteriorly ; maxillary 

 not extending to below the eye ; fold of the lower lip not 

 continuous ; anterior teeth in both jaws somewhat enlarged ; 

 cheek with 3 to 5 series of scales : 5 or 6 gill-rakers on the 

 lower part of the anterior arch. 28 or 29 scales in a longi- 

 tudinal series, 4 or 4| in an oblique series downwards and 

 backwards from origin of dorsal tin to lateral line, 1^ to 2|- 

 between lateral line and scaly sheath at base of soft dorsal. 

 Dorsal XVII-XVIII 8-10, commencing above the opercular 

 cleft, the spines subequal from the fifth or sixth to the 

 fifteenth or sixteenth, the last | to i the length of head ; soft 

 fin, when laid back, extending nearly to the middle of caudal 

 or beyond. Anal VIII-X 7-8. Pectoral nearly as long as 

 the head, extending to above the anal ; outer ray of pelvic 

 fin produced. Caudal rounded. Caudal peduncle ^ to | as 

 long as deep. Body with seven dark cross-bars, of which 

 the third, on the middle of the side, and the last, on the 

 caudal peduncle, are much more strongly marked than ther 

 rest; fins without spots. 



Rio Iroquois. 



Fourteen specimens, GO to 100 mm. in total length. 



This species is very close to G. spilururn, which has 5^ or 

 6 scales between the origin of the dorsal fin and the lateral 

 line, the dorsal spines usually higher, the last -^ to ^ the length 

 of head, and the body crossed by 7 vertical bars of equal 

 strength, the last joining the ends of the soft dorsal and anal 

 and followed by a vertically expanded spot at the base of the 

 caudal fin. 



14. Cichlosoma lethi-inus, sp. n. 



Depth of body about 2J in the length, length of head 2| 

 to 3. Snout as long as or a little longer than postorbital 

 part of head, with straight oblique profile. Diameter of eye 

 3^ to 4^ in the length of head, interorbital width 3 to 3^. 

 Depth of pr^eorbital | to 1^ the diameter of eye. Jaws equal 

 anteriorly ; maxillary not extending to below the eye ; foltl 

 of the lower lip not continuous ; teeth of the outer series in 

 both jaws moderate, gradually decreasing in size laterally; 

 cheek with 5 series of scales ; 8 gill-rakers on the lower part 

 of the anterior arch. 29 to 31 scales in a longitudinal scjies, 

 4 or 4^ in an oblique series downwards and backwards from 

 origin of dorsal to the lateral line, 2| between lateral line and 

 scaly sheath at base of anterior part of soft dorsal. Dorsal 

 XVli-XVllI 10-12, commencing above the opercular cleft, 



