124 



PROCEEDINGS OF THE NATIONAL MUSEUM 



forms a small double blotch or, when fused, a single blotch, which 

 is the most obvious mark on the body. The composition of the body 

 bands is variable; sometimss each member of a pair is in three verti- 

 cally arranged portions, either connected with or detached from each 

 other. The middle of these three portions is usually the darkest, and 

 the ventral portion the palest (the ventral portion fails to reach the 

 anal fin base). The dorsal portions of the bands reach to and enter 

 the dorsal fin taking a posterodorsal direction, sometimes reaching the 

 distal dusky margin of the fin. The area between the bands on the 

 body may be pale or dusky, usually ^\'ith some short, slender, dark 

 markings, which may extend dorsally to the dorsal fin base but usually 

 do not extend ventrally much lower than the middle of the side. 

 The dorsal portions of the body below the dorsal fin, as far posteriorly 

 as the anterior four soft rays, usually is marked with a number of 

 tiny dark spots. These spots usually appear along the margins of 

 the bands. The head is strikingly marked with a J- or U-shaped 

 dark area behind the eye (see pi. 23a, d) which is separated by a pale 

 area from the eye. The area between the arms of the J or U may be 

 pale or dusky, and the entire mark extends dorsoposteriorly from 

 behind the eye across the top of the head, where it may join with the 

 same mark from the other side. A dark, sometimes interrupted 

 stripe begins at the margin of the upper lip, extends to the ventro- 

 posterior margin of the orbit, where the stripe is interrupted by the 

 eye, and begins again at the dorsoposterior margin of the eye, where 

 it may join across the top of the head with a similar stripe from the 

 other side. There are irregular dusky areas and numerous tiny dark 

 spots on the sides of the head. The upper lip has numerous tiny 

 dark spots (comprised of groups of melanophores) that are frequently 



TABLE 58. — Frequency distribution of nunber of predorsal commissural pores of 

 specimens of Entomacrodus cadenati arranged by SL classes (in mm) 



Classes 



15-19.9 



20 



25 



30 



35 



40 



45 



50 



55 



60 



65-69.9 



75-79.9 



3 4 5 6 7 



2 - - - - 



4 1 - - - 

 1 - 



3 - 

 1 - 



- 1 



- - 1 



NxMiber of pores 

 J 9 10 11 12 13 14 15 16 



Average 



3.0 

 3.2 

 5.6 

 5.7 

 6.4 

 7.3 

 6.8 

 7.3 

 8.5 

 9.7 

 7.8 



