912 Bulletin ^7, United States National Museum. 



Trachurops crumenophthalmus, JORDAN & GILBERT, Proc. U. S. Nat. Mus., 196, 1883. 

 Caranx plumieri, CUVIEB & VALENCIENNES, Hist. Nat. Poiss., ix, 65, 1833. 

 Trachurops plumieri, POEY, Enumeratio, 78, 1875. 



418. HEMICARANX, Bleeker. 



Carangops* GILL, Proc. Ac. Nat. Sci. Phila., 1862, 431, (falcalus). 

 Hemicaraiuc,* BLEEKEU, Versl. Kon. Ak. Wet., xiv, 134, 1862, (marginatus). 



Maxillary very narrow, its greatest width scarcely i eye ; head small. 

 Teeth uniserial, few or none on vomer or palatines. Dorsal and anal tins 

 very low anteriorly, not falcate, their bases with a conspicuous sheath of 

 scales. Lateral line more or less arched in front, the plates small and 

 numerous. Tropical seas. Allied to Caranx, differing chiefly in the nar- 

 row maxillary. The American species are all rare and need further com- 

 parison, (ijfj-i, half ; Caranx.) 



a. Arch of lateral line very strong, its height more than % its length; base of pectoral merely 

 dusky; head very small; caudal lobes very unequal. AMBLYRHYNCHUS, 1305. 



aa. Arch of lateral line less convex, its height not % its length;! caudal lobes subequal. 

 b. Base of pectoral with a large jet-black area; sides in adult not barred; head small. 



ATRIMANUS, 1306. 



lb. Base of pectoral without black blotch; sides barred with black; head rather large. 

 c. Head about 3% in length ; scutes of lateral line mostly armed. 



(I Soft dorsal with 30 rays; anal with 22. SECUNDUS, 1307. 



dd. Soft dorsal with 28 rays; anal with 24. FURTIIII, 1308. 



cc. Head 3 in length ; scutes feebly armed. LEUCURUS, 1309. 



1305. HEMICARANX AMBLYRHYNCHUS (Cuvier & Valenciennes). 



Head 4 j depth 2|; eye large, as long as snout, 3 in head. D. VII-I, 

 28 ; A. II-I, 25 ; shields 50. Arch of lateral line very strong, its height 

 more than i its length, which is much less than half length of straight 

 part. Body oval, much compressed, with the axis nearly midway between 

 the back and belly ; profile very convex. Mouth very small, oblique, the 

 maxillary reaching little past front of orbit. Head small, short, about as 

 deep as long. Gill rakers shortish, rather strong, 20 below arch, anal spines 

 small, the second longest ; upper lobe of the caudal falcate, more than a 

 third longer than the lower. Lateral scutes numerous, very strong. 

 Teeth rather strong, in one series in each jaw ; teeth on tongue few or 

 none ; those on vomer and palatines minute, deciduous ; scales small ; 

 cheeks naked, breast scaly ; lateral line strongly arched, the arch about k 

 the straight portion ; scaly sheaths of dorsal and anal very high, extend- 

 ing the whole length of fin. Pectoral falcate, little longer than head, 

 reaching anal. Greenish above, with blue reflections ; sides and below 

 golden or dark silvery; caudal fin yellow, inner edge of upper lobe 

 black ; base of pectoral dusky ; a black axillary spot ; opercle faintly 

 blotched. Tropical America from Cape Hatteras to Brazil ; rather com- 

 mon in the West Indies, occasional on the coast of Carolina and Florida. 

 , blunt; fi'vyxos, snout.) 



* We have no means of knowing which of these two names has priority of date. Apparently 

 Hemicaranx was first printed. 

 t Character not verified in Hemicaranx secundus, 



