TJLAPIA. 157 



a little shorter than postociilar part of head, slightly broader than long, 

 1^ to 1| diameters of eye, Mhich is 4 to 5 times in length of head and 

 1^ to nearly twice in interorbital width ; mouth large, extending to 

 below anterior border of eye or a little beyond ; teeth very small, in 

 3 or 4 series, about 60 in outer series of upper jaw ; 2 or 3 series of scales 

 on the cheek. Gill-rakers short, 17 on lower part of anterior arch. 

 Dorsal XV-XVI 12-13 ; last spine about ^ length of head ; middle soft 

 rays much produced, as long as head. Anal III 10 ; third spine a little 

 shorter than last dorsal. Pectoral as long as head, extending a little 

 beyond origin of anal. Ventral extending beyond origin of anal. 

 Caudal truncate. Caudal peduncle as long as deep. Scales cycloid, 

 28-31 j| ; lateral lines j^jij^. Dark olive-brown ; a rather indistinct 

 dark opercular spot; vertical fins and ventrals blackish. 



Total length 149 millim. 



German East Africa and Mozambique. — Type, in Hamburg Museum, 

 examined. 



7. TILAPIA NATALENSIS. 



Chromis nUotlcus, part., Peters, Arch. f. Nat. 1855, p. 267, and Reise Mossamb. 

 . iv. p 23 (1868) ; Pfett'. Julirb. Hamb. Wis?. Anst. x. 1893, p. 149, pi. iii. 



figs. 1-4, and Tliierw. O.-AtV., Pische, p. 10, fig. (189G). 

 CJiromis mossambicus, part., Giintl). Cat. Fish, iv, [>. 268 (1862). 

 Chromis natalensis, M. Web. Zool. Jahrb., Syst. x. 1897, p. 147. 

 TUapia natalenxis, Bouleng. Proc. Zool. Soc. 1899, p. 113, and Poiss. Bass. Congo, 



p. 457 (1901) ; Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 311. 



Depth of body 23 to 2f times in total length, length of head 2| to 3^ 

 times. Head ] | to 2 times as long as broad ; snout rounded, with 

 straight or convex upper profile, as broad as or a little broader than 

 long, f to |- postocular part of head ; eye 3 (young) to 5^ times in length 

 of head, 1 (young) to 2 times in interorbital width, equal to or a little 

 less than prajorbital depth ; mouth moderate, f to | width of head, 

 extending to between nostril and eye ; teeth in 3 (young) to 6 series *, 

 50 (young) to 140 in outer series of upper jaw; 2 or 3 series of scales 

 on the cheek, width of scaly part not greater than diameter of eye. 

 Gill-rakers short, 15 to 20 on lower part of anterior arch. Dorsal 

 XV-XVI (rarely XVII or XVIII) 10-12; last spine longest, | to a 

 little over ^ length of head ; longest soft rays | to f length of head. 



* Tn a largo specimen, from I'mfulosi, a number of the outer upper teeth are simplj 

 conital. 



