74 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Tetragonoptrus (Rabdophorus) bennetti Bleeker, Atlas, Ichth. Ind. Neer- 

 land., vol. 9, 1877, p. 34, pi. (14) 376, fig. 2 (Sumatra, Java, Halmahera, 

 Amboina). 



Chaetodon vinctus Lay and Bennett, Zool. Beeche.v's Voyage, Ichth., 1839, 

 p. 62, pi. 17, fig. 1. Byam Martin Island, Paumotus. 



Depth 11^ to 1%; head 3^ to 3^, width 1^ to IJi. Snout 3 

 to 33^ in head from snout tip; eye 3 to 3%, sHghtly longer to l}/^ 

 in snout, 1 to 1% in interorbital ; maxillaiy ^ to ji in snout, S}/2 

 to S% in head; interorbital 2J4 to 3, convex. Gill rakers 5 + 14, 

 short points, 6}/^ in gill filaments which nearl}'- equal eye. 



Scales 38 to 41 between gill opening and caudal base; tubes 28 to 

 36 in lateral line; 9 scales above lateral line, 20 below. Scales with 

 8 to 11 basal radiating striae, largely marginal with age; apical den- 

 ticles 53 to 119, basal elements in 6 to 12 transverse series; circuli 

 fine. 



D. XIV, 17, 1 or 18, i, last spine 1^^ to 2 in total head length, eighth 

 ray IJ^ to 1%; A. Ill, 16, i, third spine 1^5 to 1%, seventh ray l^i 

 to 1^; least depth of caudal peduncle 2J/8 to 3; caudal Ij^ to 13^, 

 hind edge broadly convex; pectoral 1 to 1}^; ventral 1 to 1}/^. 



Pale brownish, back and bases of dorsals usually darker, also often 

 anal base. Broad deep brown band above from occiput, but not 

 meeting its fellow, down through eye over cheek and lower surface of 

 head; front and hind edges each with white line, both of v/hich usually 

 extend down slightly on side of chest. From suprascapula v/hite line 

 extends down along hind edge of opercle sloping back before and 

 below pectoral base to spinous anal origin; another more or less par- 

 allel obliquely back from suprascapula to bases of front anal rays. 

 Near end of latera,l line, over spinous anal, large black rounded spot, 

 7 to 9 scales in horizontal diameter, and with white border. Young 

 with dark brown band, 3 scales wide, across front of caudal peduncle. 



Widely distributed in the Indo-Pacific, from Zanzibar to the East 

 Indies, Melanesia and Polynesia. It is not subject to much variation 

 in color pattern, our series of specimens quite uniform. Also the 

 changes wath age are slight. 



9089. Casogoran, Malhon Island. July 27, 1909. Length 156 mm. Yellow, 

 somewhat tinged orange, scale centers brightest on either side due to slight 

 duskiness giving appearance of clear stripe through each scale row. Throat 

 and breast bright lemon. Ocular bars scarcely touch nape, centers brown, 

 edges bluish white. Pectoral stripes and edge of lateral ocellus bluish white, 

 ocellus center blackish. Brownish bar begins obscurely at bases of soft dor- 

 sal ra3's, crosses base of caudal peduncle and fades into anal. Similar bar 

 across caudal, just within hyaline tip. Edges of both soft dorsal and anal 

 somewhat orange, divided by dusky line into 2 parts. 



8447. Mactan Island, Cebu. March 25, 1909. Length 162 mm. 



9199, 9200. Mahinog, Camaguin. August 3, 1909. Length 157 to 168 mm. 



6905. Santo Domingo, Batan. November 7, 1908. Length 155 mm. Cad- 

 mium yellow, sides overshaded with dusky, leaving more or less obscure central 



