_Ocyurus chrysurus._ The Yellow-tail. The yellow-tail differs from the other snappers in the formation of the skull, the peculiar form of its body, the large, deeply-forked caudal fin, and the presence of pterygoid teeth. Its body is elliptical, with regularly-arched back; head 3; depth 3; scales 7-65-15; D. X, 13; A. III, 9; mouth small, oblique, the lower jaw projecting, maxillary reaching front of orbit; snout pointed; caudal peduncle long and slender; eye small, 5; interorbital space very convex, with median keel; upper jaw with a narrow band of villiform teeth, outside of which is a single series of larger teeth, several in front being caninelike; a large, oval patch of teeth on tongue; an arrow-shaped patch on the vomer; a narrow band of pterygoid teeth in the adult; gill-rakers long and slender, 8 + 21. _Lutianus synagris._ The Lane Snapper. Body oblong and compressed, back arched and slightly elevated; profile almost straight; head 2-3/5; depth 2-4/5; eye 5; scales 8-60-15; D. X, 12; A. III, 8; mouth moderate, maxillary reaching front of orbit; interorbital space gently convex; upper jaw with a narrow band of villiform teeth, outside of which a single series of enlarged ones; lower jaw with villiform band in front only, the row of larger teeth nearly equal in size, none of them canines; vomer and tongue with each a single patch; preopercle finely serrate, with coarser teeth at angle; gill-rakers rather long, 5 + 9; 4 small canines in front of upper jaw. _Lutianus aya._ The Red Snapper. Body rather deep, moderately compressed, the back well elevated, profile steep; head 2-3/5; depth 2-3/5; eye 5-1/2; scales 8-60-15; mouth rather large, maxillary reaching front of orbit; snout rather pointed; interorbital space strongly convex; upper jaw with a narrow band of villiform teeth, and a row of small teeth outside; lower jaw with a single row of small teeth, some of which are almost caninelike; within these is a very narrow band of villiform teeth in front of jaw only; tongue with a broad oval patch of teeth, in front of which a small, irregular patch; vomer with a broad, arrow-shaped patch; preopercle with serrated edge above, lower border dentate; gill-rakers moderate, 8 on lower arch; 4 canines in front of upper jaw.