NO. 3582 GENUS ENTOMACRODUS — SPRINGER 95 



intensified (or lack intensification). In terms of habitat occupied, 

 E. cymatobiotus is most similar to E. strasburgi. Both these species 

 occur in surge areas and on the ocean sides of reefs, whereas E. chap- 

 mani appears to be a tide pool form. 



Remarks. — Entomacrodus cymatobiotus has been collected with or 

 from the same restricted locality as E. striatus, E. rojeni, E. sealei, 

 E. caudojasciatus, and E. t. thalassinus. It differs: from E. striatus, 

 in having usually fewer gill-rakers and dorsal rays, more predorsal 

 commissural pores, and in lacking lateral branches on the main supra- 

 orbital cirrus; from E. rojeni, in having fewer vertebrae, soft dorsal 

 and anal rays, and gUl-rakers, and in having more predorsal commis- 

 sural pores at any given size; from E. sealei, E. caudojasciatus, and 

 E. t. thalassinus, in the disposition of its lip crenidae; from E. sealei, 

 in having simple preopercular pores and fewer gill-rakers; and from 

 E. caudojasciatus, in lacking a humeral blotch. 



Distribution (fig. 8). — E. cymatobiotus is restricted to the western 

 and central Pacific islands. 



Material.— Marshall Islands: Bikini Atoll, Eman Island: USNM 142183 

 (holotype of Entomacrodus cymatobiotus) ; Bikini Atoll, Namu Island: USNM 

 142160; Eniwetok Atoll, Mui Island: USNM 142181, 142182; Caroline Islands, 

 Ifaluk Atoll: SU 62033; McKean Island: USNM 198594; Jarvis Island: USNM 

 198654; Phoenix Islands, Enderbury Island: USNM 178999; Maiden Island: 

 USNM 199456; Tuamotu Archipelago, Raroia: SU 62011, 62017, 62021, 62023. 



Entomacrodus chapmani, new species 



Plates 16, 176 



Description. — (Figures in parentheses for holotype.) Segmented 

 dorsal fin rays 14 or 15 (15); segmented anal fin rays 15-17 (16), 

 usually 16; posteriormost anal pterygiophore supporting 1 or 2 (1) 

 external elements (2 in 77 percent of specimens) ; total gill-rakers on 

 first arch 13-18 (18); pseudobranchial filaments 5 or 6 (6); vertebrae 

 34; supraorbital cutI 4-8 (7), number not increasing much, if any, with 

 increase in SL (table 43); main or longest supraorbital cirrus with all 

 branches mesially (except holotype, which has one lateral branch) ; 

 tiape with 1 cirrus on each side; predorsal commissural pores 6-16 (7), 

 lumiber not increasing much, if any, with increase in SL (table 43) ; 

 preopercular series of pores with all positions with simple pores (ex- 

 cept one specimen with 1 pair of pores included in series) ; 1 pore before 

 each anterior nostrU; lateral line terminating on side in area below and 

 between dorsal fin spine 11 and dorsal ray 4 (dorsal ray 1); ventral 

 m.argin of upper lip completely crenulate; lip crenidae number 31-39 

 (37). 



Proportional measm-ements: See tables 3, 4, and 44. 



No ro.ales with fleshy rugose m.odifications of the skin of the anal 

 spines and rays were seen, but two males, 53.5 and 63.8 mm SL, 



228-965 O - 67 - 7 



