FISHE.S OF HAWAIIAN ISLANDS. 



60; 



Hynienocephalus striatulus, iifw siiL-cief^. Fij;. L'Slt. 



Typo, 144 mm. lung, fnim .■station 4r_'L', ..ff tin- si.utli\ve>it coast nf <lalni, .Icplli IUl' Ic. :;.")•_' fatlidiiis: 

 tyji.-, \(), TilUU, V. S. Xat. Mas. 



Very closely related to Jf. nnlrnun, (liffiTiiig in tlic uincli niuri' slcmlcr liul>il, the sniallcr eye, 

 with the horizontal diameter mnch longer than the \iTtical, the more |inijerting >riiiiit. Hie nicire 

 nunierons ventral rays, and the more spinons scales. 



Depth of holly ei|nalinfi; length of snont and eye; hea.l 4.S in total length. H. ii, \i i to ii, III: V. 

 15 (usually 14); I', If, (1,5 to 18), 



Head and liody very slender; anterior profile not strongly arched as in //, initr:iiis; ])rojecting 

 point at tip of snout more in'oniinent than in nutnciis, extending well bc^yond mouth; skull papery, 

 with excessively large sensory canals inclosed by delicate inend)rane; mouth large, obli(|ue; maxillary 

 reaching vertical from hinder margin of orbit; mandibular barbel usually obsolete, to be made out 

 in one specimen with the aid of a lens; teeth minute, in narrow bands in the jaws, the mandibular 

 band about half width of premaxillary band; interorbital width equal to length of snout; eye elli|i- 

 tical, its vertical diameter contained 1,4 times in the horizontal diameter, which is 0.3 length of head; 

 preopercnlar angle broadly rounded, with crenulated border, the posterior edge oblicjue; gill-mem- 

 branes ratlier narrowly joined anteriorly, entirely free from isthmus; gill-slits wide, as in IL atilnriix. 



'/f 



Fig, 259, — lli/menorcpfudiw t^triatidu^ Gilbert, th'W species, Tytie, 



Dorsal spine slender and smooth, scarcely longer than some of the succi'eding rays; base of first 

 dorsal contained 1,75 times in interspace between dorsals; first anal ray in a vertical a tritie behind 

 last ray of first dor.sal; ventrals inserted noticeably in advance of pectorals; ]iectorals long and slender, 

 their tips extending to opposite fourth or fifth anal ray, their length a trille more than half length of 

 head; oiit<^r ventral ray filamentous, reaching to ba.se of ninthjinal ray; vent innnediately in front of 

 first anal ray, its distance from base of inner ventral ray equaling distance from the latter to mandibu- 

 lar angle; a small obscure lens-like body on middle line of breast, as in //, niilniun; a similar body 

 innnediately before vent, the 2 joined by a rai.sed .strand along iniu>r abdominal wall; scales very thin 

 and caducous, an occasional patch only being pre.sent; 4 series between lateral line and ba.se of first 

 dorsal; those on brea.st, sides of body and tail essentially similar, and nnich rougher than in //. 

 iintnnui, each usually with from 'M to 30 spines, arranged in 4 to (i parallel obliciue series (quincunx 

 order); scales along sides of shoulder-girdle and on under side of inan<lible smooth. 



In color, almost exactly like //, anlr;rn.i. The body was light olive in life, with narrow dark 

 margins to the scales on the bai'k; lower half of caudal portion of body marked with coarse lilack 

 pigment spot-s, many of which are arranged in oblique or horizontal rows; under a lens, the central 

 area of many of these spots .shines with metallic luster; somewhat liner specks, more closely crowded, 

 form a wide dark band along middle of tail, which does not show the conspicuous narrow line char- 



