226 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 

 B. — Sulphur Bay, Clarion Island. 



3. Caranx orthogrammus sp. nov. (No. 28,345 U. S. Nat. Mus.) 



Allied to Caranx ferdau and G. gymnostethoides ; species with nearlj^ 

 straight lateral line, many-rayed dorsal and anal, and feeble teeth. 



Body elliptical, comiiressed, the back regularly but not strongly arched, 

 the ventral outline forming a rather even but less convex curve. Head 

 longer than deep, rather pointed in profile, its median ridge somewhat 

 elevated. Month low, oblique, the maxillary extending to nearlj^ oppo- 

 site front of pupil, its length 2;^ in head ; lower jaw slightly projecting. 



Teeth all equally minute, in villiform bands on jaws, vomer, i^alatines, 

 and tongue. Eye large, broader than preorbital, its diameter IJ in 

 length of snout, 4| in head. Adipose ejelid little developed. Cheeks 

 and temporal region with tine scales ; rest of head naked. 



Scales rather small, those below pectorals smaller ', a naked area on 

 breast, becoming wider forwards from base of ventrals. Lateral line 

 almost straight, slightlj'' undulated and curved ux)wards above pectorals, 

 becoming straight by almost imperceptible degrees opposite lobe of anal. 

 Greatest depth of the arch less than diameter of pupil; the length of 

 straight part less than that of the curve. Plates developed only on the 

 posterior third of the straight part; the jilates small, with low keels, 

 their spines little prominent; 15 to 18 plates developed, including small 

 ones, in front of which are about 10 ordinary scales on the straight por- 

 tion of the lateral line. 



Spinous dorsal very small, of three weak spines slightly connected 

 by membrane, the highest spine not longer than diameter of pupil 

 (these spines, probably, more numerous and larger in young examples) 

 Soft dorsal long and low, with slender rays; a well-developed scaly 

 basal sheath anteriorly. Elevated rays in front a little more than one- 

 third the base of the tin, a little more than half length of head; anal 

 shorter than dorsal, its anterior lobe equally high, and with a similar 

 basal sheath. Free anal spines obsolete in typical specimen. Caudal 

 lobes moderate, equal, as long as head, their length equal to the depth 

 of the fin from' tip to tip. Pectoral tin falcate, its tip very slender, 

 reaching eighth ray of anal, its length 2J in body. Yentrals short, 2^ 

 in head. 



Head 23 in length to base of caudal; depth 3|. 



Fin rays : D. IIl-I, 32. A. II-I, 20. 



Coloration in spirits, smutty olivaceous, everywhere irregularly 

 cloude<l with darker, the belly scarcely paler than the back ; opercular 

 spot obsolete. Dorsal, anal, posterior border of caudal, and tips of 

 ventrals blackish ; tins otherwise dull olivaceous. 



A single specimen of this si)ecies, 16 inches in length, was obtained by 

 Lieutenant Nichols, at Sulphur Bay, Clarion Island, off the west coast 

 of JVIexico. 



It is certainly very close to Caranx ferdau (Giinther, Fische Sudsee, 



