ALESTES. 193 



1. ALESTES DENTEX. 



Salmo dentex, Linn, in Hasselq. Reise Palsest. p. 395 (1757). 



Salmo dentex, part., Linn. Syst. Nat. i. p. 531 (176(5). 



Characinus niloticus, Geoffr. Descr. Egypte, Poiss. p. 50, pi. iv. fig. 2 (1809). 



Myletes hasselquistii, Cuv. Mem. Mus. iv. 1818, p. 449, pi. xxi. fig. 2. 



Alestes dentex, Mull. & Trosch. Hor. Ichth. i. p. 13, pi. ii. fig. 6 (1845) ; Heckel, 

 Russegger's Reise Egypt, iii. p. 307, pi. xxi. fig. 2 (1849); Glinth. Cat. Fish, 

 v. p. 312 (1864), and Petherick's Trav. ii. p. 242 (1869) ; Bouleng. Ann. & 

 Mag. N. H. (7) viii. 1901, p. 488 ; Werner, Site. Ak. Wien, cxvi. i. 1906, 

 p. 1127; Bouleng. Fish. Nile, p. 113, pi. xviii. fig. 1 (1907). 



Alestes hasselquistii, Cuv. & Val. Hist. Poiss. xxii. p. 180 (1849). 



Alestes setliente, Cuv. & Val. t. c. p. 190 ; Glint!), t. c. p. 313 ; Sfceind. Sitzb. Ak. 

 Wien, lxi. i. 1870, p. 541. 



Myletes dentex, Eigenm. Proc. U.S. Nat. Miis. xxxiii. 1907, p. 29. 



Depth of body of to 4§ times in total length, length of head 4^ to 

 6 times. Head If to 2^ times as long as broad, 1^ to 1^ times as long as 

 deep ; 6nout not projecting beyond lower lip, as long as or slightly longer 

 than eye ; eye lateral, its diameter ?>\ (young) to i\ times in length of 



Fi K . 140. 



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X? 



Alettes ii nte.v, 

 Lower Nile (P. N.). J-. 



head ; adipose eyelid well developed ; interorbital region very convex, 

 its width 2^ to 3 times in length of head ; maxillary not reaching to below 

 anterior border of eye ; 14 teeth (g) in upper jaw, 10 (^) in lower; lower 

 border of second suborbital longer than diameter of eye in adnlt. Gill- 

 rakers rather long and slender, 20-26 on lower part of anterior arch. 

 Dorsal II 8, beginning just behind vertical of base of ventrals, equally 

 distant from eye and from root of caudal, or slightly nearer latter; first 

 vol. I. o 



