ADDENDA 103. URANOSCOPID^ ASTROSCOPUS. 
941 
serrate. Soft dorsal and aual angular behind. D. XIII, 19; A. Ill, 
17; scales 6-42-17. {Giintlicr.) West Indies, north to Florida Keys. 
(L. Syst. Nat.; Gunther, ii, 12.) 
Page 615. After Pomacanthus ciliaris add: 
964 (&). P. tricolor (Bloch) J. & G. — Blaclc Angel. 
Head, caudal fin, anterior part of trunk, and margins of soft dorsal 
and anal yellow; rest of body black. Preopercular spine grooved, 
reaching to posterior margin of opercle. Soft dorsal, anal, and upper 
ray of caudal, moderately produced. D. XIV, 19; A. Ill, 18; scales 
8-48-25. [Giinther.) West Indies, north to Florida Keys. 
( Clicetodon tricolor Bloch, Ichth. xii, 1797, taf. 425: Rolacanthus tricolor C. & V. vii, 
1C2: Holacantlnis tricolor Gunther, ii, 49.) 
Page 617. After Acanilmrus chinirgus add: 
966 (&). A iiig:ricasBS (L.) Bloch. 
Closely related to Acanthurus chirtirgus, difiering in the longer snout, 
which is more convex in its upper jiortion. Caudal triangular, scarcely 
concave behind; vertical bands on the side very narrow, nsnally dis- 
appearing after death; fins without oblique striims. {Poey.) West In- 
dies, occasionally northward (said to have been once taken at New 
York). 
{ChcEtodon nigricans Linn. Syst. Nat.: Acanthurus jdileiotomus Cuv. & Val. s, 176, 
tab. 2S7, 1835: Acanthurus phlehotomus Foej , Anal. Soc. Esp. Hist. Nat. 18S0, 245.) 
966 (c). A. tractus Poey. 
Distinguished most readily by the length of the caudal lobes, especi- 
ally the upper, which is notably longer than the lower, its tip ending 
in a whitish thread; anterior iirofile moderatel 3 ^ curved. Dorsal with 
faint oblique streaks. Bodj’ usually without dark streaks. West In- 
dies and both coasts of Me iico, occasional northward. 
(Acanthurus chirurgus C. & V. x, 163 (not Chcetodon chirurgus Bloch); Poey, Mem. 
Cuba, ii, 208, 1860; Poey, Anal. Soc. Esp. Hist. Nat. 1880, 246.) 
Page 628. Astroscopm y-grceoum and A. anoplus are ver^' closely" re- 
lated, The following distinctive characters may be found useful: 
In A. anoplus the i)ale spots are much smaller, less sharply- defined, 
and occupy a smaller area than in A. y-grtccum; the lower jiart of head 
has two black blotches in both species; the second dorsal, anal, and 
ventrals are nearly' or quite plain. The naked area behind each eye is, 
in A. anoplus^ lunate, its length barely twice that of the snout; the bony 
V-shaped plate is short and broad, concave on the median line, and 
forked for about half its length, the posterior undivided portion broader 
