716 Bulletin 4J^ United States National Afusetim. 



mostly naked except aloiif^ the anterior margin. Scales of body minute, 

 especially above. Dorsal liu low posteriorly ; the height of its anterior 

 lobe equaling that of anal, or length of postorbital part of head: its 

 longest ray * the base of the fin; last rays of dorsal and anal much ele- 

 vated in young; caudal lunate, its lower lobe nearly half longer than the 

 upper; middle rays about as long as eye. Veutrals inserted midway 

 between base of caudal and middle of eye, their length a little less than 

 that of pectoral, and equal to postorbital part of head; insertion of anal 

 opposite that of dorsal. Color green, silvery below; no lateral stripe; 

 pectorals and dorsal blackish. Scales and bones green. Length 3 to 5 

 feet. West Indies, Florida Keys to Brazil ; genei'ally abundant ; a large, 

 vigorous species, occasionally becoming dangerous in its leaps from the 

 water. The young occasionally northward (Ocean City, New Jersey — 

 Bean), {(ia^iq, rhapMs, a sharp instrument ; an old name of the pike.) 



Belone rapiiidonia, Eanzani, Nov. Comm. Ac. Nat. Sci. Inst. Bonon., v, 1842, 359, pi. 37, fig. 1, 



Brazil; Gvntheb, Cat., vi. 249, 1866. 

 Belone gerania, Cuvier & Valenciennes, Hist. Nat. Poiss., xviii, 437, 1846, Martinique; GCn- 



THER, Cat., VI, 241, 18G6 

 Belone crassa, PoEY, Memorias, ii, 291, IS'il, Cuba. 



Belone melanochira, Poey, Memorias, :i, 294, 1861, Havana; Gunther, Cat., vi, 249, 1S66. 

 Tylosmtis gladins, Bean, Proc. U. S. Nat. Mus., 1882, 239, 430, Pensacola. (Type, No, 301.51. 



Coll. Stearns.) .Iordan & Gilbert, Synopsis, 901, 1883. 

 Tylosurm rdpliklomn, Jordan, Proc. U. S. N.it. Mus., 1886, 35; Jordan & Fordice, I. c, 353. 

 .Tylosnnis crassus, .Tokdan, Proc. U. S. Nat. Mus., 1S84, 112. 



1063. TTLOSURUS GALE ATI'S (Cuvier .t Yaiencieunes). 



D. 15 ; A. 17. An imperfectly known species, apparently diifering from 

 T. raphidoma in having the caudal little forked and in having no caudal 

 keel. Scales small. Beak rather strong, 1| times length of rest of head. 

 Top of head with a bony casque. Its surface smooth; its borders with 

 notches like those on a violin. Cayenne. (Cuvier & Valenciennes.) 

 (galeatus, having a helmet.) 



Belotie grileata, CoviEK & Valenciennes, Hist. Nat. Poiss., xviii, 420, 1S46, Cayenne. 



1064. TTLOSURUS PACIFICUS (Steindaclmer). 



D. 21 to 22 ; A. 19 or" 20. Closely allied to Tylosuriis acus, the teeth 

 shorter and weaker, the greatest depth of body equal to length of pec- 

 toral. A grayish lateral streak. Acapulco to Panama; a large species; 

 not common. 



Belone pacifica, Steindaciiner, Iclith. Beitr., iii, 65, 1875, Panama; Acapulco. 

 Tylosurns pacifictm, Jordan & Gilbert, Proc. U. S. Nat. Mus., 1882, 624. 



106.5. TTLOSURUS ACUS (LacOpedo). 

 (HOUNDFISII; Aoi'.ton.) 



D. 23; A. 21 ; scales 380. Caudal keel strong, black; 1 or more folds of 

 skin across the preopei'cle; scales and bones green. Beak strong, more 

 elongate than in TyJotturus raphidoma, its length about twice that of rest 

 of head; greatest depth of body about t length of pectoral. Dorsal tin 



