84 U.S. NATIONAL MUSEUM BULLETIN 202 Vol. 2 



to about 80 mm. usually with distinctly contrasting bands, though 

 these absent in some; specimens of all sizes with small black spot at 

 upper edge of pectoral insertion and broad intense black saddle, 

 about as wide as diameter of eye, on upper part of caudal peduncle 

 just behind soft dorsal fin; vertical fins all dark or dusky in largest 

 specimens, distal half of dorsal pale in middle-sized specimens and soft 

 rays of dorsal, anal, and caudal, pale in specimens under 50 mm.; 

 specimens 18 to 35 mm. with a large round black spot in anterior 

 portion of spiny dorsal reaching from third to 7th spines; pectoral fins 

 pale in specimens under 100 mm., dusky on basal portions in larger 

 ones; pelvics entu-ely dark or with broad median portion dark in largest 

 specimens, inner rays pale in specimens under 50 mm., with only 

 outer ray black. 



Color when alive. — Lips pale whitish, preorbital and suborbital 

 whitish in some specimens, grayish in others; opercular membrane 

 pale; iris yellow, body dark grayish brown with alternating light and 

 dark bands, indistinct in some specimens, with general body color 

 very dark or bands contrasting white and dark grayish brown; black 

 spot on upper pectoral base; broad black saddle on top of caudal 

 peduncle just behind soft dorsal; spiny dorsal fin with scaly sheath 

 dark grayish, spines and membranes light grayish or light tan, soft 

 dorsal dark on basal %, with broad yellowish margin on posterior rays; 

 anal blackish; caudal with blackish base, a broad yellowish sub- 

 marginal band, and with tips of rays black, or caudal completely 

 black; pectorals dusky basally, pale distally, pelvics blackish. 



ABUDEFDUF SAXATILIS (Linnaens) 



Plate 85, B 



Chaetodon saxatilis Linnaeus, Systema naturae, ed. 10, p. 276, 1758 (type 



locality, India). 



SPECIMENS STUDIED 



Guam Island, Tumon Bay, Jan. 8, 1946, Gressitt and Ingram, 48 specimens, 

 41 to 61 mm.; Guam Island, Tumon Bay, Nov. 29, 1945, Gressitt, 2 specimens, 

 53 and 54 mm.; Guam Island, Nov. 25, 1945, D. G. Frey, 1 specimen, 69 mm. 



Description.— BotsbI fin rays XIII, 12 (rarely 11 or 13); anal 11,12 

 (rarely 11); pectoral ii,17; transverse scale rows 27 or 28, with 3)^ 

 between end of lateral line and scaly dorsal sheath, 1 1 between lateral 

 line and anal origin; upper part of lateral hne with 20 or 21 tubular 

 scales; gill rakers 7 or 8+1 + 17, totaling 25 or 26 (3 counts). 



Depth of body 1.7 to 1.9; head 2.8 to 3.1 ; both in standard length 

 (tip of snout to upper edge of gill opening). Snout 4.1 to 4.6; eye 2.5 

 to 3.1; preorbital width 9.7 to 10.9; length of upper jaw 3.3 to 3.4; 

 postorbital part of head (hind margin of eye to upper edge of gill 

 opening 2.7 to 3.1; interorbital width 3.0 to 3.2; depth of caudal 



