NO. 3582 GENUS ENTOMACRODUS — SPRINGER 135 



4. Poulo Cecir de Mer, McKean, Swains, Tiituila, Tau, and 

 Tongotapu Islands (pi. 25) : A relatively large dark humeral blotch 

 is present; there is no secondary humeral mark. There may be little 

 or no color pattern on the body other than the humeral blotch or 

 there may be faint indications of the body bands, or indications of 

 the body bands and irregidar longitudinal rows of pale dusky spots, 

 or only dusky spots. There are occasionally present indistinct or 

 irregidar dark or dusky stripes and bands on the upper lip. 



5. Tahiti, Makatea, Raroia, and Rarotonga: No humeral dark 

 blotch is present; the only markings in the humeral region are small 

 scattered dusky spots. There are weak to strong indications of 

 the paired body bands but no distinct pale or dark spots. There 

 may be seven dark stripes on the upper lip. 



The body bands in the various populations are usually represented 

 only by diffuse pairs of blotches along the midline of the body and 

 the dark humeral blotch (and the secondary humeral mark), which 

 represents the anteriormost pair of bands. The pair of bands 

 frequently found on the caudal peduncle of other members of the 

 Entomacrodus nigricans species group is frequently absent. 



The head is variably and irregularly marked, usually pale in 

 females, darker in males. Only a few specimens exhibited any indi- 

 cation of a dark spot just posterior to the eye. The underside of the 

 head may be uniformly dusky (usually so in females) , may bear broad 

 dusky chevrons separated by pale stripes (some males) or, in some 

 New Britain specimens, may bear faint indications of dark chevrons. 



The color pattern types of the fins can be best determined from 

 the plates (25, 26, 27), although the dorsal fins of specimens from 

 Poido Cecir de Mer appear to be almost uniformly dusky rather than 

 variably dusky as appears in the illustrated specimens. The stripes 

 on the caudal fin increase in number with increase in SL. The anal 

 fin of females is always paler (spines frequently without melanophores) 

 than in males from the same collection. In only one specimen 

 (USNM 200100) was there a dark crescentic mark on the fleshy 



TABLE 65. --Frequency distribution of number of predorsal commissural pores of specimens of 

 Entomacrodus caudofasciatus (all populations combined) arranged by SL classes (in mm) 



Number of pores 

 7 8 9 10 11 12 13 U 15 16 17 18 19 20 21 25 Average 



15-19.9 



20 



25 



30 



35 



40 



45 



50 



-411--------------- 4.7 



112312------------- 6.8 



11323344131-------- 9.3 



-31235643322------- 10.0 



--1232412211-112--- 11.1 



----11 3 2 1 1 4 2 1 1 1 1 2 - - 13.8 



---11---111--2---21 15.5 



------1---1----1--- 14.3 



