232 CHAEACIX1D.E. 



1. PETERSUTS MODESTUS. 

 Bouleng. Ann. Mus. Congo, Zool. i. p. 72, pi. xxxvii. fig. 6 (1899), and Poiss. Bass. 

 Congo, p. 169 (1901). 



Depth of body of times in total length, length of head 4 times. Head 

 hardly longer than deep, with straight upper profile ; lower jaw projecting 

 beyond upper; snout shorter than eye, which is 2^ times in length of 

 head and equals interorbital width ; maxillary extending to below 

 anterior border of eye ; outer prsemaxillary teeth 4, alternating with 

 those of the inner row, 8 in number ; 8 teeth in lower jaw. Gill-rakers 



Fig. 175. 



Petersius modestus. 

 Type (A. M. C). i. 



moderately long, about 12 on lower part of anterior arch. Dorsal II 8, 

 originating above last ray of ventral, at equal distance from eye and from 

 caudal, longest ray as long as head. Anal III 20. Pectoral a little 

 shorter than head, not quite reaching ventral. Caudal forked, with 

 pointed lobes. Caudal peduncle a little longer than deep. Scales 

 40 si , 2 between lateral line and root of ventral. Silvery, back olive ; 

 fins pale yellow, adipose dorsal orange. 



Total length 65 millim. 



Upper Congo (Lake Leopold II.). — Type in Congo Museum, 

 Tervueren. 



2. PETERSIUS HILGENDORFI. 



Bouleng. Ann. Mus. Congo, Zool. i. p. 91, pi. xxxvii. fig. 5 (1899), and Poiss. Bass. 



Congo, p. 168 (1901) ; Pellegr. Bull. Soc. Philom. (9) ix. 1907, p. 23, fig. 



Depth of body 3 to 3-J times in total length, length of head 3| to 

 3§ times. Head hardly longer than deep, with slightly concave upper 

 profile; lower jaw not projecting beyond upper; snout shorter than eye, 

 which is 2| to 3 times in length of head and equals interorbital width ; 

 maxillary extending to below anterior border of eye ; outer prsemaxillary 

 teeth 4, alternating with those of the inner row, 8 in number; 8 teeth 



