1372 Bulletin 4.7, United States National Museum. 



West, and Cedar Keys. (Named for "Maj. Gen. J. H. Lefroy, F. R. S., gov- 

 ernor of the Bermudas, a gentleman of well-known scientific attainments 

 and reputation, who while doing so much for the social and political wel- 

 fare of the islands is also taking an active part in the development of the 

 Natural History." Goode. ) 



Diapterus lefroyi, GOODE, Amer. Jour. Sci. and Arts 1874, 123, Bermudas ; EVERMANN & 



MEEK, Proc. Ac. Nat. Sci. Phila. 1886, 259. 

 Eucinostomus producing, POEY, Enumeratio, 55, 1875; and Ann. Lye. Nat. Hist. N. T. 



1876, Havana. 

 Eucinostomus lefroyi, GOODE, Bull. U. S. Nat. Mus., V, 39, 1876. 



561. XYST^EMA, Jordan & Evermann. 



(MOJARRAS BLANCAS.) 

 Xystcema, JORDAN & EVERMANN, Proc. Cal. Ac. Sci. 1895, 471 (cinereus). 



This genus differs from Gcrres in having the preopercle entire. The 

 hody is compressed, but not greatly elevated, and the second anal and 

 fourth dorsal spines are less enlarged than in Gerres. The second inter- 

 haemal is long and spear-shaped, not hollow, and not receiving the air 

 bladder, its structure as in Gerres. One species, widely distributed. 

 (%v&rov f shaft of a spear; aijua, blood, for inter haemal.) 



1749. XYST^EMA CINEREUM (Walbaum). 



(MOJARRA DE CASTA; MOJARRA BLANCA; BROAD SHAD.) 



HeadSi; depth 2-J- to 2 -; eye about 3J- in head; snout 3^; interorbital 

 width 31- ; scales 6-45-10. Body compressed, elongate, back moderately 

 elevated, the dorsal profile being evenly convex; mouth moderate, the 

 maxillary extending but slightly beyond the vertical at anterior margin 

 of orbit, its exposed portion triangular in form and twice as long as wide, 

 its length being contained five times in that of the head; preorbital and 

 preopercle entire; premaxillary groove broad and free from scales; gill 

 rakers weak, 7 below the angle; distance from end of snout to dorsal fin 

 2 in length of body ; second dorsal spine longest, about 1 in head and 

 not much stronger than the others; all the dorsal spines are weak and 

 flexible; general outline of the upper margin of the spinous dorsal falcate; 

 second and third anal spines subequal, second 2f to 2f in length of head, 

 the pectorals scarcely reaching anal, their length being contained 3 times in 

 that of body; ventrals contained If times in head, and scarcely reaching 

 the vent. Color silvery, with bluish reflections above ; sides with 7 or 8 

 broken, bluish vertical bars, about equaling pupil in width, most distinct 

 in life, and present at all ages; no dark stripes along scales; dorsal and 

 caudal fins dusky; other fins pale; ventrals with a few dark punctula- 

 tions; axil dark; eye white; spinous dorsal and ventrals golden in life. 

 Length 12 to 15 inches. Both coasts of tropical America, and the West 

 Indies, north to southern Florida and Lower California; generally com- 

 mon in waters of moderate depth; entering rivers; a good fish of con- 

 siderable importance, being much larger in size than species of Gerres. 



