SPAROID FISHES OF AMERICA AND EUROPE. 521 
The specimens examined by Higenmann and Hughes, now 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 inter- 
gradation is so perfect that no tangible specific distinctions 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 the descriptions, the wnimaculatus of 
Bloch & Schneider, Cuv. & Val., and Jordan & Gilbert, the caribaus 
of Poey, and the humeri-maculatus Quoy & Gaimard represent 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 form ( flavolineatus). 
Greatest depth, 2 in length. 
Ventral outline very much rounded. 
Distance from insertion of first dorsal 
spine, obliquely to snout, 14 in 
depth. 
The more slender form (unimaculatus). 
Greatest depth, 24 in length. 
Ventral outline almost straight. 
Distance from insertion of first dorsal 
spine, obliquely to snout, 1 in 
depth. 
Teeth about one-third narrower than in 
the more slender form. 
Body more compressed. 
120. ARCHOSARGUS POURTALESII. 
Sargus pourtalesii Steindachner, Fische Afrikas, 39, 1881 (Galapagos Islands). 
Archosargus pourtalesii, Jordan & Bollman, Proc, U. 8S. N. M. 1889, 186 (Chatham 
Island of the Galapagos). 
Habitat: Galapagos Islands. 
Etymology: To Louis F. de Pourtalés, a friend and associate of 
Agassiz, who was with him on the Hassler expedition, by which this 
fish was discovered. 
This species is known to us from the description and excellent figure 
given by Dr. Steindachner and from a specimen obtained by the Alba- 
tross on Chatham Island. The differences between pourtalesii and 
unimaculatus are very slight, and might be ignored were it not for the 
remote and restricted habitat of the Pacific form. 
121. ARCHOSARGUS TRIDENS. 
Sargus tridens Poey, Enumeratio Pisce. Cub., 57, 1875 (Cuba). 
Archosargus tridens Eigenmann & Hughes, 1. c., 1887, 70 (copied). 
Habitat: Cuba. 
Etymology: Tres, three; dens, tooth. 
This species is known to us only from the description of Prof. Poey. 
Its distinctive characters need verification, it being perhaps an ab- 
normal specimen of Archosargus unimaculatus. 
