922 Bulletin 47, United States National Museum. 



compressed ; the dorsal and ventral outlines regularly and nearly equally 

 arched ; a low occipital carina ; a prominent supraocular ridge. Scales 

 comparatively large, the scaly sheaths of the vertical fins moderately 

 developed. Cheeks and upper part of opercles scaled ; breast scaly. 

 Teeth in a narrow band above, those in front somewhat enlarged, 

 those of lower jaw mostly in one series ; feeble teeth on tongue, vomer, 

 and palatines. Mouth rather small, the jaws nearly equal ; maxillary 

 reaching front of pupil, 2f in head. Eye large, 3^ in head, the adipose 

 eyelid well developed. Gill rakers numerous, very long and slender, 28 

 below angle. Curve of lateral line low, the straight part beginning under 

 first ray of second dorsal ; length of arch If in straight part. Scutes of 

 lateral line strong. Pectoral fins very long, slender, and falcate, their 

 length considerably more than that of the head, 2f in length of body, 

 their tips reaching fourth anal ray; ventrals short; second dorsal and 

 anal a little elevated in front, the longest ray half length of head, the 

 last rays of the fin scarcely rising above the scaly sheath. Greenish above, 

 golden below ; a black blotch on the opercle, no spots elsewhere ; fins 

 greenish, with faint dusky shades, nowhere distinctly black. Pacific Coast 

 of tropical America, Cerros Island to Panama, straying northward to San 

 Diego ; very common from Guaymas southward. Closely related to C. crysos, 

 of which it is a representative on the Pacific Coast. Among our specimens 

 of Caranx crysos from Key West, are some which agree closely with the 

 type of Caranx caballus, having the pectoral scarcely shorter ; it is not 

 likely that the two forms can be distinguished as species, and perhaps 

 not even as varieties, (caballus, horse; the names Caballo and Horse- 

 mackerel are often applied to species of Caranx.) 

 Trachurus loops, GIRARD, Pac. R. K. Surv., Fish., 108, 1858, San Diego; not Caranx boops, CUVIER 



& VALENCIENNES. 

 Caranx caballus,* GUNTHER, Fish. Centr. Amer., 431, 18C9, Panama; JORDAN & GILBERT, Proc. U. 



S. Nat. Mus., 1880, 456; JORDAN & GILBERT, Proc. U.S. Nat. Mus., 1883, 199; JORDAN & 



GILBERT, Synopsis, 435, 1883. 

 Caranx girardi,* STEINDACHNER, Ichthyol. Notizen, ix, 25, 1869, San Diego; based on Trachurus 



boojjs, GIRARD. 

 Caranx boops, GIT,L, Proc. Ac. Nat. Sci. Phila., 1862, 261. 



Subgenus CARANGICHTHYS, Blceker. 

 1316. CARANX MARGINATUS, Gill. 



Head 3i; depth 2; eye 3. D. VIII-I, 19; A. II-I, 15; scutes 30. Body 

 more elongate than in Caranx latus, the back less elevated, and the pro- 

 file less steep. Eye larger, 3 in the young of C. latus of same size. 

 Teeth moderate, the anterior in both jaws little enlarged ; maxillary 2 in 

 head, reaching beyond pupil ; teeth and mouth essentially as in Caranx 

 latus. Gill rakers rather long, about 12 below angle; scutes rather 

 weaker than in C. latus ; arch of lateral line 1 in straight part, an 

 abrupt angle at junction of the two parts which is under sixth dorsal ray ; 

 pectoral longer than head ; cheeks and upper parts of opercle scaly ; 



*We do not know which of these two names of the same date is entitled to priority. Giiu- 

 ther's paper was written first and probably printed first. 



