BULLETIN OF THE UNITED STATES FISH COMMISSION. 
364 
Linophora Kaup, 1. c., [auriga: scales in series running downward and backward). 
Sarothrodus Gill, Proc. Ac. Nat. Sei. Phila. 1862, 238 ( Chu’todon Cuvier, not Artcdi: offered as a substitute for ('hsetodon, the 
latter name being transferred to Pomacanthus ). 
Tholirhthys Gunther, Ann. Mag. Nat. Hist. 1868, 457 ( osseus; larval form). 
Tetragonoptrus Bleeker, Rev. Faraille Chsetodontoides, in Verh. Kon. Ak. Weten., XVII, 52, 1877 ( stnatus; scales below in 
horizontal series; spinous dorsal not more than half longer than soft). 
(ha’todovtops Bleeker, op. oil., 53 (scales on lower part in ascending series). 
Hemichatodou Bleeker, 1. c. ( capistratus; scales below running downward and backward, forming an angle with those 
above). 
Lepidochutodon Bleeker, op. cit.. 54 ( unimacidatus; scales anteriorly much enlarged). 
Gonorhatodon Bleeker, 1. c., ( triangulum; body very deep; the base of posterior half of soft dorsal and anal vertical). 
Ox iH'liwtodon Bleeker, Atlas Ichth., IX, 51, 1877-78 ( lincolatus: scales very large, snout pointed). 
Chwtodon Jordan & Gilbert, Synopsis, 614, 1883 (restriction to capistratus). 
Anisochxtodon Klunzinger, Fiselie Rothen Meeres, 54, 1884 ( auriga ). 
KEY TO HAWAIIAN SPECIES OF < ’MASTODON. 
a. Rows of scales of anterior part of body running upward and backward, each marked by a dark line, those of posterior 
part of body running downward and backward almost at right angles wit li the first; snout acute; 
dorsal fin with the first ray prolonged in a whip, a black ocellus below it; ocular band broad; 
ventrals pale; two black lines across caudal . setifcr, p. 364 
aa. Rows of scales not arranged as above indicated, or at least not marked by lines, meeting at an angle. 
h. Scales unequal, those on the middle parts of body larger than the others. 
c. Series of scalesextending upward and backward, at least posteriorly; teeth very small: snout acute, concave in 
upper profile; yellow; a broad, black ocular band, as broad as eye. 
it. Black area at base of soft dorsal broad, sending oblique streaks downward and forward across the body ; no 
black area on shoulder .. Uneolatus, p. 365 
dd. Black area at base of soft dorsal narrow; oblique cross streaks along rows of scales orange; shoulder region 
black with a median triangular orange area on each side. lunula, p. 366 
cc. Series of scales nearly horizonal; teeth much larger than in related species; snout moderate, the profile projecting 
above eye; sides of back with a large black ocellus, often produced downward in a wedge- 
shaped blotch; ocular band broad, meeting its fellow on breast; a black band on margin of 
dorsal and anal across caudal peduncle. unimacidatus, p. 368 
l)b. Scales subequal, the series extending horizontally or slightly ascending posteriorly: snout obtuse or moderately 
acute, not convex above. 
i . Body with crossbands or streaks. 
/'. Body with about six transverse crossbands; ocular band narrow, faint; a black spot above it; a reddish banp 
on caudal peduncle . punctatofasciatus , p. 369 
ff. Body with about ten narrow dark cross streaks, each a row of small spots; ocular band narrow; anal with a 
narrow dark edge . miliaris, p. 371 
cc. Body without crossbands or vertical streaks. 
g. Ocular band present; snout obtuse. 
h. Ocular band preceded by a black bar. 
/ Black bar before eye covering snout; a black bar behind ocular band; body with dark streaks along 
the rows of soales; a black area surrounded by golden oil dorsal and anal and caudal; a black 
. spot on breast . trifasciatus, p. 372 
it. Black bar before eye not covering upper lip. which is pale; a black area above eye; three black bands 
behind eye, the first one extending backward to last ray of soft dorsal; body with six oblique 
orange stripes; caudal with two black stripes; anal with one . ornat issiinus, p. 373 
hh. Ocular baud not preceded by a black bar. 
j. Back blackish, with two whitish blotches; ocular band orange, with dark edges; tins pale, with 
dark lines . quadrimaculatus, p. 373 
jj. Back with diffuse dark spots; ocular band broad, diffuse; snout black, ventrals black; no 
yellow . corallicola, p. 374 
gg. Ocular band none; body with about nine oblique stripes of clear blue; caudal peduifme and posterior 
part of dorsal black; caudal with a broad black band; snout rather acute. .frcmhlii. p. 375 
292. Chaetodon setifer Bloch. Plate XI.YIl. 
Head 3.1 in length; depth 1.75; eye 4 in head; snout 2.5; mouth 7.25; maxillary 3.9; interorbital 
4; l>. \m, 24; A. hi, 21; scales 7-40-11. 
Body very deep, compressed; bach elevated, very trenchant; head deep; snout short, nearly 
horizontal; mouth very small; jaws produced, rather pointed, equal; lips thin, fleshy; teeth broad, 
brush-like in bands in jaws; eye superior, midway in head; interorbital width broad, convex, nostrils 
close together, with raised fleshy edge, posterior an Oblique slit in front of eye; dorsal spines graduated 
to last, which is longest, 2 in head; fifth and sixth dorsal rays longest, produced in a point; third anal 
spine longest, 1.5; median anal rays longest, ninth, 1.25; caudal small, truncate; pectoral small, 1.3; 
