NO. 3582 GENUS ENTOMACRODUS — SPRINGER 93 



were undeveloped, as were the crenidations on the lateral portions 

 of the ventral margin of the upper lip. 



Color pattern of preserved material. — In male specimens 

 over about 30 mm SL the sides of the body are usually uniformly 

 pale. Some specimens have diffusely dusky markings on the sides 

 in the form of 3-5 pairs of midlateral spots. The remainder of the 

 body in these specimens may be imiformly pale or marked with 

 scattered fine, light dusky spots and dashes. One mature male from 

 Jarvis Island (pi. 15) was unique in having a better developed color 

 pattern than was found in the other specimens. In this specimen 

 there were six pairs of midlateral bars (in the drawing, the anterior 

 pair hidden by the pectoral fin). The bands were variously inter- 

 rupted, but the posterior four pairs tended to diminish in intensity 

 dorsally and ventrally as they extended to the body contours. Dif- 

 fusely dusky marks were scattered over the sides of this specimen. 

 In males below 30 mm SL the paired markings on the sides of the 

 body appeared much more frequently than among larger males. 



On most males, the most intense mark on the side of the head is a 

 dark elongate spot about half an eye diameter posterior to the eye. 

 This spot is followed by an irregular pale stripe, then a broad irregu- 

 larly dusky area, another pale stripe, and sometimes another broad 

 dusky area. In some males there were several additional pale dusky 

 stripes directed ventrally and ventroposteriorly from the orbit. 



The top of the head is irregularly dusky and the ventral portion 

 pale and unmarked. The upper lip bears scattered dusky spots. 



The spinous dorsal of males is either uniformly light dusky with a 

 narrow pale distal margin or irregularly dark dusky with indications 

 of light or dark spots and a pale distal margin. The soft dorsal 

 bears up to four rows of dusky spots over each ray, with the distal 

 portion of the fin imiformly pale dusky. The anal fin is pale proxi- 

 mally, grading into dark dusky distally. The caudal fin bears up to 

 about nine irregular vertical rows of dusky spots, usually overlying 

 the rays; the number of rows is greater in large than in small speci- 

 mens. The pectoral fin is light dusky, increasing slightly in intensity 



TABLE Al. --Frequency distribution of number of predorsal commissural pores of 

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



