940 Bulletin 47, United States National Afuseum. 



a. Bursal with 19 to 20 soft rays; anal with 17 to 19 soft rays. 



/). Body very much comprcssod; sides with narrow black cross bars; lobt-s of vertical fins 

 elongate, reaching past middle of caudal fin in adult. 

 c. Snout subtruncate or nearly vertical; profile from supraorbital to front of dorsal fin 

 convex. OLAUcrs, l;?35. 



cc. Snout low, very oblique; profile from supraorbital region to dorsal scarcely con- 

 vex; bands on body narrow, obsolete in the young; vertical fins with red. 



RHOIIOPUS, 133G. 



/'/). liody moderately compressed; sides without narrow black cross bars; lobes of vertical 

 fins shorter, rarely reaching base of caudal; lobes of dorsal and anal usually 

 blackish. 

 J. Body broad, ovate; the back arched; the greatest depth at all ages nearly % length 

 of body; profile from nostril to dorsal everywhere nearly evenly convex; axil 

 without black spot. 

 e. Lobes of vertical fins much elevated, that of dorsal in adult much longer than 

 head; color pale. fai.catus, 1337. 



ce. Lobes of vertical fins low, that of dorsal in adult shorter than head; color 

 dusky. cULVF.ur, 1338. 



(/(/. Body oblong, the profile not strongly arched; the depth in young and old 2 to 2g 

 in length of bodj-; dorsal lobes low. 

 /. Axil with a Jet-black spot; depth about 1}.^ in length; snout blunt, project- 

 ing beyond the mouth. kf.nnedvi, 1339. 

 ff. Axil not black; depth about 2j in length. ooodei, 1340. 

 nci. Dorsal with 25 to 27 soft rays; anal with 22 to 26 soft rays; body oblong, rather robust; 

 greatest thickness 3 in greatest depth of body; depth less than half length; lobes of 

 vertical fins short, not black; sides without dark cross bars. 

 (/. Dorsal with 25 soft rays; anal with 22 soft rays; profile from snout to procumbent spine 

 evenly convex. 

 h. Body very deep, the depth about half length. argenteus, 1341. 

 hh. Body moderately deep, the depth about 21^^ '•> length. 



i. Head moderate, about 4 in body; dorsal lobe pale. carolints, 1342. 



ii. Head large, 334 t" -^J^ in body; dorsal lobe black. paioma, 1343. 



gg. Dorsal with 27 soft rays; anal with 26. cavennensis, 1344. 



1335. TRACHINOXrS OLAUrUS (Bloch). 

 (Gaff-top.sail Pampano ; Old Wife; Talometa.) 



Head 4; depth 2 ; eye 3?. D. Vl-I, 19; A. II-I, 18. Pyloric cceca 13. 

 Body elliptical, much compressed; suout blunt, subtruncate, vertical 

 from mouth to horizontal from upper edge of eye; the profile from 

 supraorbital to front of dorsal fin convex. Mouth nearly horizontal ; 

 maxillary nearly reaching vertical from middle of eye, its length 3 in 

 head; jaws without teeth in the adult; dorsal spines separate in the 

 adult; dorsal and anal tins falcate, the anterior soft rays reaching middle 

 of caudal tin ; dorsal lobe lA, anal If in length of body ; ventrals reach- 

 ing ;| distance to vent, their length 2? in head ; caudal very deeply forked, 

 its lobes nearly half length of body. Color bluish above, golden 

 below; lobes of dorsal and anal very dark; rest of fins pale, with bluish 

 edges; caudal bluish; pectorals golden and bluish; ventrals whitish. 

 Body crossed by four black vertical bands ; the first is under the pro- 

 cumbent spine, the second under the third dorsal spine, the third and 

 fourth under the soft dorsal; a black spot, representing a fifth band, on 

 lateral line between last rays of dorsal and anal ; this is sometimes obso- 

 lete; the position of these bauds appears to be subject to slight variation. 



