334 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 2 



ventral line of head; no definite dark blotch behind eye; usually- 

 several dark spots evident tlirough abdominal wall opposite intestines. 

 Remarks. — This species is most closely related to E. caudofasciatus 

 (Regan) but may be distinguished from that species by lacking the 

 greatly intensified dark spot just above and behind pectoral fin base. 



ENTOMACRODUS DECUSSATUS (Ble«ker) 



Plate 116,F,G 



Salarias decussatus Bleeker, Nat. Tijdschr. Nederl.-Indie, vol. 15, p. 230, 1858 

 (type locality, Western Biliton and Sangi Islands; in sea). 

 SPECIMENS STUDIED 

 Guam: Nov. 26, 1945, Frey, 6 specimens, 72 to 132 mm. in standard length. 



Description. — Dorsal rays XIII, 17; anal 11,17 to 19 usually 11,18 

 or 19; pectoral 14, with lower 5 or 6 rays swollen; branched caudal 

 5+4; pelvics 1,4; orbital tentacle single with cii'rate edges; nuchal 

 flap single or with an extra cirrus basally; nasal cirri about 5 to 7. 



Head 3.7 to 4.0; greatest depth 4.0 to 4.2; longest pectoral ray 4.3 

 to 4.5; snout tip to anus 1.9 to 2.0; anal fin base 2.4 to 2.6; all in 

 standard length. Eye 4.5 to 5.2; snout 2.7 to 2.8; postorbital length 

 of head 1.6; greatest depth of body 1.0 to 1.1; least depth 2.2 to 2.5; 

 longest pectoral ray 1.1; longest dorsal spme 2.2 to 2.5; all in length 

 of head. Fleshy interorbital space 1.7 to 2.1 in eye. 



Orbital tentacle single, thin, but broad at the base, tapering to a 

 point distally, its edges with numerous cirri, and its length from % 

 to % eye diameter; nuchal dermal flap usually single, broad at base 

 but thin, rapidly tapering to a point, its edges with one to a few 

 short cu-ri (especially on adults), its length about equal to pupil di- 

 ameter; nasal flap, palmate, with pedunculate base, then a broad 

 thin flap, with several cirri distally; snout profile rounded, with a 

 slight forward slant from the vertical; edge of upper lip a little cren- 

 ulate, that of lower lip smooth; lateral Ime abruptly arched over 

 pectoral fin, then following a course along midlengthwise axis of body, 

 ending over rear part of anal fin base; vertical fine through dorsal 

 origin passes just behind pelvic bases; dorsal fin with a moderately 

 deep notch over last dorsal spme; a membrane attaches last dorsal 

 ray to caudal peduncle as far back as base of caudal fin; anal origin 

 about under bases of second or thkd from last dorsal spines; last anal 

 ray without membrane posteriorly; pectoral fins not quite reaching 

 to anus; anal spines small, embedded on females, first anal rays of 

 adult males not swollen at tips; posterior canine in each side of lower 

 jaw small, projecting laterally into mouth cavity; teeth fine, numer- 

 ous, movable, of equal size in both jaws; vomer with a transverse 

 series of short conical teeth ; no cephalic crest. 



