ADDENDA 103. URANOSCOPIDJE ASTROSCOPUS. 941 



serrate. Soft dorsal and anal angular behind. D. XIII, 1.9; A. Ill, 

 17; scales 6-42-17. (Giinther.) West Indies, north to Florida Keys. 



(L. Syst. Nat,; Gunther, ii, 12.) 



Page 615. After Pomacanthus ciliaris add: 

 964 (&). P. tricolor (Bloch) J. & G-. Black 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, aual, and upper 

 ray of caudal, moderately produced. D. XIV, 19; A. Ill, 18; scales 

 8-48-25. (Giinther.) West Indies, north to Florida Keys. 



(Cliaitodon tricolor Bloch, Icbtli. xii, 1797, taf. 425: Holacanthus tricolor C. & V. vii, 

 162: HolacantJins tricolor Giinther, ii, 49.) 



Page 617. After Acanthurus chirurgus add: 

 966 (&). A iiig-ricans (L.) Bloch. 



Closely related to Acanthurus chirurgus, differing in the longer snout, 

 which is more convex in its upper portion. Caudal triangular, scarcely 

 concave behind; vertical bands on the side very narrow, usually dis- 

 appearing after death; fins without oblique stripes. (Poey.} West In- 

 dies, occasionally northward (said to have been once taken at New 

 York). 



(Chcftodon nigricans Linn. Syst. Nat.: Acanthurus phlebotomus Cuv. & Val. x, 176, 

 tab. 287, 1835: Acanthurus pMebotomus Poey, Anal. Soc. Esp. Hist. Nat. 1880, 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 profile moderately curved. Dorsal with 

 faint oblique streaks. Body usually without dark streaks. West In- 

 dies and both coasts of Me dco, occasional northward. 



(Acanthurus chirurgus C. & V. x, 1G8 (uot Chcetodon chirurgus Bloch) ; Poey, Mem. 

 Cuba, ii, 208, I860; Poey, Aual. Soc, Esp. Hist. Nat. 1880, 246.) 



Page 628. Astroscopus y-grcecutn and A. anoplus are very closely re- 

 lated. The following distinctive characters may be found useful : 



In A. anoplus the pale spots are much smaller, less sharply defined, 

 and occupy a smaller area than in A. y-grcecum; the lower part 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 



