NO. 3582 GENUS ENTOMACRODUS — SPRINGER 91 



Freshly caught specimens bear about 5}2 pairs of vertical reddish- 

 brown bands on the body, the half pair at the caudal peduncle. The 

 preopercular area exhibits several reddish-brown vertical stripes. 

 These markings are lost in preservation. 



Relationships. — Entomacrodus sfrasburgi is a member of the E. 

 cymatobiotus species group. For differentiation, see key couplets 27 

 and 28. In addition, E. strasburgi appears to differ from the other 

 two members of the group in having a shorter caudal fin. 



Entomacrodus strasburgi (fig. 8) has been collected with only one 

 other species of Entomacrodus, E. marmoratus. Both species are 

 endemic to the Hawaiian Islands and are the only species of 

 Entomacrodus known from these islands. Both occur in the surge 

 zone on rocky shores at depths not exceeding two meters. 



Remarks. — There is indication of sexual dimorphism in segmented 

 dorsal ray numbers. Of those specimens sexed (20.0 mm SL and 

 larger) 4 males had 14 rays and 13 males had 15 rays; 1 female had 

 13, 9 had 14, and 1 had 15 rays. There was no other apparent sexual 

 dimorphism of meristic characters, except that of all the specimens, 

 only 3 males had a B condition anal ray count as high as 18. 



HoLOTYPE. — ^USNM 179202, an immature male, 35.0 mm SL, 

 Makapuu Point, Oahu, Hawaii, Feb. 21, 1963, W. A. Gosline and 

 class. 



Paratypes.^USNM 199272, three immature males, 28.0-29.8 mm 

 SL, collected with the holotype; USNM 200283, 36 specimens, 14.5- 

 32.1 mm SL, including 13 males, 11 females, and 12 sex indeterminates, 

 same locality as holotype, Feb. 19, 1966. 



Other possible material (23 ophioblennius larvae, 15.0-19.5 mm 

 SL), not included in tables: Oahu: USNM 149991; Lanai: USNM 

 164993; Molokai: USNM 118063, 133913, 133918, 164992 (note: an 

 additional three larvae, the largest two included in USNM 164993 

 and the largest in USNM 164992, are E. marmoratus) . 



Etymology. — Named for Donald W. Strasburg in recognition of 

 his studies on Hawaiian Blenniidae. 



Entomacrodus cymatobiotus Schultz and Chapman 



Plates 15, 17a 

 Entomacrodus cymalohiolus Schultz and Chapman, 1960, U.S. Nat. Mus. Bull. 

 202, pt. 2, pp. 335-337 [Eman Island, Bikini Atoll, Marshall Islands]. 



Description. — Segmented dorsal fin rays 13-15 (14 in 84 percent 

 of specimens); segmented anal fin rays 14-16 (15 in 85 percent of 

 specimens) ; posteriormost anal pterygiophore supporting 1 or 2 

 external elements (supporting 2 in 92 percent of specimens) ; total 

 gill-rakers on first arch 10-16 (12-14 in 75 percent of specimens); 

 pseiidobranchial filaments 4-7 (5 in 71 percent of specimens), number 



