70 BULLETIlsr 100, UNITED STATES NATIONAL MUSEUM 



65993 U.S.N.M. Tari Tari, Gilbert Islands. Albatross collections. 2 examples. 



Length, 61 to 83 mm. 

 31253 to 31264 A.N.S.P. Apia. Bureau of Fisheries. Length, 29 to 59 mm. 

 48619 A.N.S.P. Philippines. Commercial Museum of Philadelphia. Length, 



50 mm. 



POMACENTRUS CAERULEUS Quoy and Gaimard 



Pomacentrus caeruleus Quoy and Gaimaed, Voy. Uranie, Zool., 1824, p. 

 397, pi. 64, fig. 2. Mauritius.— CuviEB, Hist. Nat. Poiss., vol. 5, 1830, p. 418 

 (Mauritius). — Sauvage, Hist. Nat. Madagascar, Poiss., 1891, p. 429 (type). 



Depth 22^ to 23,4; head 31/3 to 32/5, width 1% to 14^. Snout 

 4 to 4%; eye 2% to 3, greater than snout or interorbital; maxillary 

 reaches opposite front eye edge, 3% to 3% in head; teeth uniserial, 

 compressed, ends rounded; interorbital 3 to 31/^, broadly convex; in- 

 fraorbital edge entire; preopercle edge rather coarsely denticulate 

 behind. Gill rakers 8-|-13, lanceolate, slender, long. 



Tubes in lateral line 16 or IT, pores 8 or 9+1 or 2; 3 scales above 

 lateral line, 9 below, 16 predorsal; 3 rows of cheek scales, infraor- 

 bital naked and row on preopercle flange much smaller than others. 

 Scales with 8 or 9 basal radiating striae; apical denticles 73 to 81, 

 with single or double row of basal elements ; circuli fine. 



D. XI to XIII, 13, I or 14, i, thirteenth spine 1% to 1% in head, 

 eighth ray 1% to 1%, often first and second rays simple; A. II, 14, 

 I or 15, I, second spine 1^3 to 1%, ninth ray 1^4 to li^, often first 

 ray simple ; least depth of caudal peduncle 1% to 2 ; pectoral 1 to 1% ; 

 ventral 1 to l-^X) ; caudal emarginate, 2^2 to 3 in combined head and 

 body. 



Cobalt blue generally, variegated with azure, producing dark 

 mottled appearance on head above and along back above lateral 

 line. Blue bar from end of snout to eye and blue line all along 

 lower eye border on infraorbital. Upper scale of opercle at begin- 

 ning of lateral line with black spot, less than half size of pupil. 

 Smaller and less defined dusky spot at pectoral origin. Iris pale 

 olivaceous or yellowish. Dorsals and anals largely deep neutral 

 gray, soft fins slightly olivaceous basally. Caudal and caudal pe- 

 duncle largely dull brownish, with olivaceous tinge on caudal, of 

 which hind border slightly deep gray. Paired fins pale or light 

 brownish. 



Mam-itius and Philippines. We have compared this species care- 

 fully with Pomacentrus pavo, from which it differs in no way ex- 

 cept color pattern and the more plump body. In P. pavo the pale 

 blue spots on the head are always smaller and tend to form lines or 

 streaks, these also extending along the upper and lower or submar- 

 ginal portions of the body. The enclosed median space of the sides 

 is then contrasted by vertical pale streaks, only as spots posteriorly 

 in the young. In P. caei^leus the coloration is more as shown in 



