Cichlid Fishes of the Genus Tylochromis. 



165 



1. Tylochromis microdon, sp. n. 



relmatochromit lateralis (part.), Boulong. Cat. Afr. Fish. iii. p. S85 

 (1915). 



Depth of body 2^ to 2f in the length, length of head 3. 

 Snont from a little longer than to nearly twice diameter of 

 eye, which is 3^ to nearly 5 in length of iiead, equal to or 

 less than interorbital width or prpeorbital depth. Maxillary 

 not extending to below eye ; teeth small ; 3 series of scales on 

 cheek; 15 or 10 gill-rakers on lower part of anterior arch ; 

 lower piiaryngeal teeth mostly slender, compressed, hooked ; 

 a triangular area on the posterior third of the plate with 



Fig. 1. 



A. Lower phaiyng-eal of Tylochromis microdon (x 2) from a specimen 



24U mill. long. . 



B. Ditto of Tylochromis mylochn (X 2) from a epecmien 235 mm. loug. 



moderately enlarged, rounded, blunt teeth. Dorsal XIV-XYI 

 12-15 ; spines rapidly incrca.sing to fifth or sixth, which is 

 ?'or a little more than ? length of head, thence decreasing or 

 subequal. Anal III 7-8 ; third spine strong, about ^ length 

 of head. Pectoral longer than head and reaching anal ni 

 the young, but not in the adult. Caudal scaly, truncate or 

 sH"-htly emar^inate. Caudal peduncle longer than deep. 

 Scales" 33 to 35 in a longitudinal series, 6 between origin of 

 dorsal and lateral line, 22 to 26 in upper lateral line, 22 to 24 

 in lower, 2 between lateral lines. 



