182 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
135. Naucrates ductor (Linnaeus). Pilot-fish; Romero; “Annexation-fish.” Fig. 68. 
Head 4 in length; depth 4; eye 5 in head; snout 3.5; 11. iv-i, 26; A. ii-i, 16. 
Body rather elongate, little compressed; snout rather blunt; mouth terminal, oblique, small; 
maxillary scarcely reaching orbit; caudal keel large, fleshy; pectoral short and broad; ventrals rather 
large. 
Bluish, with 5 to 7 broad, dark vertical bars, extending on the fins. 
Length 2 feet. A pelagic fish, found in all warm seas; occasional on our Atlantic coast from Cape 
Cod to the West Indies. 
The earliest evidence we have of the occurrence of this fish among the Hawaiian Islands is that 
furnished by a painting made by Mrs. .1. B. Dillingham from a specimen obtained by her in the 
Fig. 68 .—Naucrates iluctor (Lmuxus); after Jordan and Evermann. 
Honolulu market. The painting was examined by us and is undoubtedly of this species, which is 
locally known as “annexation fish,” having appeared at the date of the annexation of Hawaii to the 
jurisdiction of the United States. A specimen in good condition, collected by Dr. Julius llosenstein, 
is in the museum of the California Academy of Sciences at San Francisco. 
Gastcrosteus ductor Linnaeus, Syst. Nat., Ed. X, 295, 1758, “in Pelago.” 
Gastcrosteus antecessor Daldorf, Skriv. Nat. Selskab. Kjob., II, 155, 1800. 
Scomber kidrruteri. Bloch & Schneider, Syst. Ichth.,570, 1801. locality not given. 
Centronotus conductor Lactfpcde, Hist. Nat. Poiss., Ill, 311, 1801. 
Naucrates fanfar us Itafinesque, Caratteri, 41, 1810, Sicily. 
Naucrates iudicus Lesson, Voyage Goquille, 157, pi. 14, fig. 2, 1830, India. 
Naucrates noveboracensis Cuvier & Valenciennes, Hist. Nat. Poiss., VIII, 325, 1831, New York. 
Scrinla dussumicri Cuvier &. Valenciennes, op. cit., IX, 217, 1833, Gulf of Bengal. 
Scriola succincta Cuvier & Valenciennes, op. cit., IX, 218, 1833, between Cape of Good Hope and St. Helena. 
Nauclcms comprcssus Cuvier & Valenciennes, op. cit., IX, 249, pi. 263, 1833, Molucca. 
Naadcrus abbrcvititus Cuvier & Valenciennes, op. cit., IX, 251, 1833, Indian Ocean. 
Nauclcrus brachyccn.trns Cuvier & Valenciennes, op. cit., IX, 253, 1833, Indian Ocean, Moluccas. 
Nauderus annularis Cuvier & Valenciennes, op. cit.. IX, 254, 1833, between the Cape of Good Hope and St. Helena. 
Nauderwtieticums Cuvier & Valenciennes, op. cit., IX, 255, 1833, between the Cape of Good Hope and St. Helena. 
Naucrates cyanophrys Swainson, Nat. Hist. Fishes, etc., II, 412, 1839, Palermo, Nice. 
Naucrates serratus Swainson, op. cit ., 413, 1839 (on Scomber ductor Bloch). 
Xystopliorus sp., Richardson, Voyage Erebus and Terror, 52, pi. 30, lig. 22, 1844 (young). 
Tht/nnus pompilus Gronovv in Gray, Cat. Fishes, 123, 1S54, Mediterranean Sea, Spain, America. 
% Naucrates ductor , Gunther, Cat., II, 371, 1860 (Polperro, Falmouth, Madeira, Cape Seas, south Pacific, northwest coast of 
America); Jordan & Evermann, Fish. North & Mid. Amcr., I, 900, pi. 139, fig. 379, 1896; ibid., Amer. Food and Game 
Fishes, 298, with figure, 1902. 
Genus 108. SERIOLA Cuvier. The Amber-Fishes. 
Body oblong, moderately compressed, not elevated; occiput and breast not trenchant; head usually 
more or less conical, not very blunt; mouth comparatively large, with broad bands of villiform teeth 
on jaws, tongue, vomer and palatines; a broad, strong supplemental maxillary bone; premaxillaries 
protractile; scales small, lateral line scarcely arched, a keel on the caudal peduncle, not armed with 
bony plates; sides of head with small scales; first dorsal with about 7 low spines, connected by 
membrane; second dorsal very long, elevated in front; anal similar to the soft dorsal, but not nearly 
so long, shorter than the abdomen, preceded by 2 very small free spines, which disappear in old 
