Analysis of Speoies 
End of mandible without terminal keel below, 
]> • Strongylura, Caudal truncate, rounded behind with age, 
lateral line not forming keel on caudal peduncle. 
c. 1 . D. II, 10 to II, 13 * II # 13 to 15 » 
d^. Scales 125; no caudal spot.-— -—urvillii• 
d 2 . Scales 170; caudal with blaok basal spot.-—- 
J> ,«W 1% I I I1MWI ■ 
e 2 , D. II, 14 to II, 18; A. II, 17 to II, 23. 
e^. Body subcylindrical or compressed. 
fHead 2-h to 2-7/l0.--—---inci sa . 
f^« Head 2-4/5 to 3^-. 
g^. Scales 185 to 200.————————leiura. 
2 
JS • Scales 300,——————-— —tahitiensis. 
e 2 . Body strongly compressed.-- kreffti. 
b 2 . Tylosurus. Caudal forked (emarginate or nearly truncate 
*. 
in young); lateral line forms keel on caudal peduncle. 
h^-. Last dorsal rays not elongated or black. 
.1 
_i • Caudal peduncle wide as deep. 
j 1 , D. II, 17 or II, 18; A. II, 18; eye 
2-1/3 in postooular.--.-eroorte: 
£ 2 * D. II, 18 or II, 19; A. II, 17 to II, 19j 
eye 3 in postooular, - 
* 
jf* D. II, 19; A. II, 22 to II, 24. 
v ■ 
k^-. Eye 2 in postocular— - terebra. 
k • Eye 3% in postooular. — - —forox, 
