70 REVIEW OF LAGODON, ARCHOSARGUS, AND DIPLODUS. 



Diplodm unimaculaius Jonlau & Gilbirt, Proc. U. S. Xat. Mus., 1834, 128 



(Key West); Bean, Proc. U. S. Nat. Mus., 1864, 156; Jordan, Cat. Fishes 



North America, 91, No. 1065, 18S5; .Jordan, Proc. U. S. Nat. Mus., L'^SG, 



43 (Havana). 

 Sparua salin Lac^pede, Hist. Nat. Poiss., iv, 1S6, 180:' (based on unimaculatus 



of Blochj. 

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



(Rio Janeiro). 

 Sargus flavolineatus Cnvier & Valenciennes, Hist. Nat. Poiss., vi., 60, 1830 



(Cuba); Storer, Syn. Fish U. S., 333, 1845 (copied); Gunther, Cat. Fish 



Brit. Mus., i, 446, 1859 (copied); Poey, Syn. Pise. Cub., 310, 1868 (copied); 



Poey, Enumeratio, 57, 1875 (copied). 

 Diplodus flavoUneatuH Jordan, Proc. U. S.Nat. Mus., 1886, 42 (Havana). 

 Sargus caribau>i Poey, Mem. Pise. Cub.. II, 197, 1860 (Cuba); Poey, Syn. Pise. 



Cub., 309, 1868 (Cuba); Poey, Enumeratio, 56, 1S75 (Cuba); Poey, Fauna 



Puerto Riqueua, 328, 1881 (Porto Rico). 

 Z)i^/o(i«8carJ&(BHS Jordan & Gilbert, Syn. Fish North America, 930, 1883(copied). 



Habitat. — West Indiaii Fauna, north to Key West ; south to Eio Ja- 

 neiro. 



The numerous specimens examined by us are from Key West and from 

 . Havana. 



The specimens before us differ decidedly in the proportions, the color, 

 and the size of the teeth ; but while the differences of the extremes are 

 very marked, the intergradation is so perfect that no tangible difference 

 can be made out. We have only the deeper form (flavolineatus) from 

 Key West, while we have both extremes from Havana. 



As far as we are able to judge from the figures and descriptions the 

 unimaculatus of Bloch, Bloch & Schneider, Cuv. & Val. and of Jordan 

 & Gilbert, the cariha^us of Poey and the hvmeri-maculatufi Quoy & 

 Gaimard rejiresent the more slender form, while the flavolineatus Cuv. 

 & Val. represents the deeper form. 



The differences of the extreme forms seem to be these : 



The deeper forin {flavolineatus). The more slender form (nnim(iculatus). 



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



Ventral outline very much rounded. Ventral outline almost straight. 



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

 spine, obliquely to snout, 1^ in depth. spine, obliquely to snout, 1 iu depth. 



Teeth about one-third narrower than 

 in the more slender form. 



Body more compressed. 



Skeleton. — Skull essentially as in A. 2)rohatocephalus ; the occipital 

 crest thinner, its honey-combed structure not exposed; a deep notch in 

 the supra-ocular bone in front. Teeth short, abruptly narrowed at 

 the base to a third of the width of the cutting edge. Maxillary with a 

 small foramen in front ; the outer coat of the bones thin. 



A species very close to Archosargus unimaculatus has been lately de- 

 scribed from the Galopagos If;lands as Sargus pourtalesii (Steindachuer, 

 Fische Afrika's, 39, 1881). 



