246 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



1% to 2jV; caudal II/5 to 1%, with slightly emarginated hind edge; 

 least depth of caudal peduncle 21/2 to 31/5 ; pectoral 11/3 to 1% ; ven- 

 tral 11/3 to 134. 



Light brown generally; 6 or 7 longitudinal or horizontal dusky 

 or dark brown bands, much narrower than interspaces, though lower 

 two less distinct than others. Iris reddish brown. Dorsals with 

 blackish edge, broad on spinous fin; bases of dorsal spines alter- 

 nately darker; following on soft dorsal from uppermost dark band 

 row of large blackish spots. Caudal with hind edge narrowly black- 

 ish and 4 rows of black spots on fin. Soft anal with blackish edge at 



Figure 18.- 



-Plbctorhinchus diagbammus (Linnaeus), 

 markings 



Variation of color 



apex and several dark spots in 2 rows. Paired fins pale, with dark 

 transverse bar across pectoral base and ventral base darker. 



Arabia, Zanzibar, Madagascar, India, Ceylon, East Indies, Philip- 

 pines, Melanesia, Micronesia, Polynesia. Bennett's figure of Bodicm 

 cuvier shows but few spots on the soft vertical fins. 



My materials agree with Bleeker's figure of Plectorhynchus sebae 

 though varies in having a few more spots usually on the soft dorsal 

 and many more spots on the caudal. Also some examples have the 

 second dark band below the eye well on the snout above the maxil- 

 lary, thus differing from Bleeker, though well shown in Garrett's 

 figure of Diagrai7ima lessonii as published by Giinther. The bands 

 and spots are individually quite variable, often so on the two sides 



