1360 Bidletin 47, United States National Museum. 



Salema, Mabcgkave, Hist.Pisc, 153, 1648, Brazil. 



Bream, Browne, Jamaica, 446, No. 1, 1756, Jamaica. 



Perea unimaculata, Bloch, Ichthyologia, pi. 308, 1792, Brazil ; on a figure by Prince 



Maurice. 

 Sparus salin, LACfiPfeDE, Hist. Nat. Poiss., IV, 136, 1803; based on imimamlatus of Bloch. 

 Sargus humeri-maculatus, Quoy & Gaimard, Voyage Freycinet, Zool., 297, 1825, Rio 



Janeiro. 

 Sargvs flavolineatus, Cuvier & Valenciennes, Hist. Nat. Poiss., vi, 60, 1830, Cuba ; GiJN- 



THER, Cat. Fisbes, I, 446, 1859. 

 Gyncedus hrama, Gronow, Cat. Fishes, Ed. Gray, 56, 1854, South Carolina. 

 Sargus caribceus, Poey, Memorias, ii, 197, 1860, Cuba. 



Qrammistes unimaculatus, Bloch & Schneider, Syst. Icbtli., 184, 1801 ; after Bloch. 

 Sargus unimaculatus, Cuvier & Valenciennes, Hist. Nat. Poiss., vi, 62, 1830; Gunthee, 



Cat. Fisbes, i, 446, 1859; Eigenmann & Hughes,* Proc. U. S.Nat. Mus. 1887, 69. 

 Diplodus caribcpus, Jordan & Gilbert, Synopsis, 930, 1883. 

 Diplodus flavolineatus, Jordan, Proc. U. S. Nat. Mus. 1886, 42. 

 Archosargtis unimamlatus, Jordan &, Fesler, I. c, 520. 



1734. ARCH08ARGUS POURTALESII (Steindacbner). 



Head Sh; depth 2|. D. XIII, 10; A. Ill, 10; scales 7 or 8-48-15. Pec- 

 toral fin reaching second anal spine; body rather less deep, the snout a 

 little longer; ventrals shorter, 5 to 5| in head; otherwise essentially as 

 in Archosargiis unimacidatus, of which it is the Pacific coast representa- 

 tive. Galapagos Islands, rather scarce, one specimen obtained by the 

 Albatross on Chatham Island. The dift'ereuces between t\\Q jyourtaJesii and 

 unimaculatus are very slight, and might be ignored were it not for the 

 remote and restricted habitat of the Pacific form. (To Louis F. de Pour- 

 tales, a friend and associate of Agassiz, who was with him on the Hassler 

 expedition, by which this fish was discovered.) 



Sargus pourtalesii, Steindachner, Fisebe Afrikas, 39, 1881, Galapagos Islands. 

 Archosargus pourtalesii, Jordan & Bollman, Proc. U. S. Nat. Mus. 1889, 186; Jordan & 

 Fesler, I. c, 521, 1893. 



1735. ARCHOSAROUS TRIDENS (Poey). 



Head more than 4; depth 2,% in total length with caudal; eye 3^ in 

 head, 1 in snout. D. XII, 10; A. Ill, 9; maxillary extending to a poin^ 

 between the pupil and the anterior border of the eye. Incisors f on each 

 side. Profile with a slight depression above the eye; second anal spine 

 much longer than the third. Color grayish, belly white ; 8 golden longi- 



* Tbe specimens examined by Eigenmann and Hugbes, now before us, differ decidedly 

 in the proportions, the color, and the size of the teeth; but while tbe differences of the 

 extremes are very marked, the iutergradation is so perfect that no tangible specific dis- 

 tinctions can be made out. We have only the deeper fomi (flavolineatus) from liey West, 

 while we have both extremes from Havana. So far as we are able to judge from the 

 figures and the descriptions, the viiiitiiicidatus of Bloch & Schneider, Cuvier & Valen- 

 ciennes, and Jordan &. Gilbert. iIm ivm ;/.<ri/.v of Poey, and the humeri-maculatus Quoy & 

 Gaimard, represent the more .^li mlci Im m, while the flavolineatus Cuvier & Valenciennes 

 represents tbe deeper form. The dilicreiices of the extreme forms seem to be these: 

 The deeper form (flavolineatus): | The more slender form (unimacrilatus): 



Greatest depth, 2 in length. Greatest depth, 2^ in length. 



Ventral outline very much rounded. I Ventral outline almost straight. 



Distance from insertion of first dorsal I Distance from insertion of first dorsal 



spine, obliquely to snout, IJ in depth. spine, obliquely to snout, 1 in depth. 



Teeth about ^ narrower than in the more 

 slender form. 



Body more compressed. 



