ALESTES. 193 



1. ALESTES DENTEX. 



Salmo dentex, Linn, in Hasselq. Eeise Falsest, p. 395 (1757). 



Salmo dentex, pari., Linn. Syst. Nat. i. p. 531 (1766). 



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

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

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

 Mag. N. H. (7) viii. 1901, p. 488 ; Werner, Sitz. 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 setJiente, Cuv. & Val. t. c. p. 190 ; Giinth. t. c. p. 313 ; Steind. Sitzb. Ak. 

 Wien, Ixi. i. 1870, p. 541. 



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



Depth of body 3f to 4f times in total length, length of head i^ to 

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

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

 than eye ; eye lateral, its diameter S^ (young) to 4^ times in length of 



Fig. 140. 



Alestes d. ntex, 

 Lower Nile (F. N.). i- 



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 (2) in lower; lower 

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

 rakers rather Icng 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. 



