BULLETIN OF THE UNITED STATES FISH COMMISSION. 435 
4. ORCYNOPSIS UNICOLOR. 
Scomber unicolor Geoffroy-St. -Hilaire, “Descr. Eg. Poiss., pi. 24, f. 6, 1827” (Egypt). 
Pelamys unicolor Guichenot, Explor. Alg6r., Poiss., 58, 1850; Gunther, ii, 368, 1860 
(Mediterranean Sea). 
Cybium bonaparli Verany, “Atti dell’ ottava riunione degli scienziati Ital., Genova, 
493, 1846.” 
Pelamys bonaparti Filippi and Yerany, Memor. della Keal. Accad. scienze di Torino, 
ser. 2, t. xviii, 1857. 
Thy nnus per egrinus Collett, Meddelelser om Norges Fiske, 20, pi. 1, 1879 (Christiania). 
Habitat.— Mediterranean Sea; once taken at Christiania, Norway. 
Etymology: unus , one; color , color. 
This species is known to us from descriptions only. 
Genus IV._ GYMNOSARDA. 
Gymnosarda Gill, Proc. Acad. Nat. Sci. Phila., 125, 1862 (unicolor = nuda). 
Thynnus Liitken, Spolia Atlantica, 460, 1880 (pelamys ; not of Cuvier nor of Fabri- 
cius). 
Thynniclithys Giglioli, Cat. dei Pesci Italiani, 25, 1880 (thunnina ; not of Bleeker, a 
genus of Cyprinid^e). 
Euthynnus Liitken, MSS. in Syn. Fish. N. A., Jordan & Gilbert, 429, 1883 (thunnina). 
Type : Thynnus unicolor Riippell =Pelamys nuda Gunther. 
Etymology : yupvoq, naked ; < rdpda , Sarda , an allied genus. 
We adopt this neglected name of Dr. Gill, instead of Euthynnus , be- 
cause the descriptions of Gymnosarda nuda , especially that given by 
Dr. Klunzinger (Fische des Rothen Meeres), agree in all generic re- 
spects with the type of Euthynnus. The names Thynnus and Thynnich- 
thys are, of course, ineligible for any mackerels, being preoccupied in 
other departments of zoology. The three or four species of small tunny 
which constitute this genus are tropical in distribution and of little value 
as food. 
ANALYSIS OF SPECIES OF GYMNOSARDA. 
a . Lateral line making a decided curve immediately beneath the second dorsal. 
Corselet strongly developed, covering the entire space between the diagonals 
connecting the posterior extremity of the spinous dorsal and the base of the 
pectorals. Posterior margin of preopercle about 1| in inferior margin. Pec- 
torals reach the vertical from the tenth dorsal spine. Back bluish ; belly sil- 
very ; four brownish stripes on each side of belly, parallel with the lower curve 
of the body ; no spots below the pectorals. Body oblong, robust. Head 3^ ; 
depth 4. D. xv-12-vm ; A. n, 12-vn Pelamis, 5. 
aa. Lateral line nowhere making a very distinct curve. Corselet well developed, 
not covering the entire space between the diagonals connecting the posterior 
extremity of the spinous dorsal and the base of the pectorals. Posterior margin 
of preopercle about 2 in inferior margin. Pectorals reach the vertical from the 
ninth dorsal spine. Bluish above ; sides and belly silvery ; no stripes of any 
kind below the lateral line ; above the lateral line several wavy, oblique 
streaks ; five round black spots about as large as pupil below the pectoral. 
Body fusiform, robust. Head 3f ; depth 4£.' D. xv-i, 12 -yiii ; A. 12-vn. 
Alletterata, 6. 
