346 U.S. NATIONAL MUSEUM BULLETIN 202 Vol. 2 



ground coloration of males brownish or light brownish, with or 

 without 6 or 7 darker double bars; dorsal fin dusky distally with 

 lengthwise narrow pale or whitish streaks; cephalic crest blackish; 

 side of head sometimes with irregular pale markings; greatest 

 depth 4.5 to 5.0, head 3.5 to 4.4, both in standard length. 



I. edentulus (Bloch and Schneider) 

 5b. Orbital ientacle composed of 1 to 3 (usually 1 in young) cirri branch- 

 ing from base, their length Ys to Yi eye diameter; nuchal dermal 

 flap broad and thin, with numerous cirri on its edges; dorsal fin 

 without notable notch over last dorisal spine; dorsal rays 

 about XII, 19; anal 11,19 or 20; background coloration light 

 brown to brown, with 8 vertical, double, dark brown bars more or 

 less connected, ending dorsally and ventrally at bases of median 

 fins to form double dark spots; anterior part of body with round 

 whitish spots from size of pupil to that of eye and with numerous 

 lengthwise, short, parallel black lines more widely spaced on 

 lower sides; anteriorly above pectoral fin, body and spiny dorsal 

 finely spotted with black dots; underside of head with two trans- 

 virse broad dark brown bands, edge of gill membrane brown; a 

 broad transverse dark brown band through pelvic base and one 

 across abdomen between pectoral bases, another about equi- 

 distant between pelvic bases and anal origin; greatest depth 3.5 

 to 4.5; head 3.2, to 4.2, in standard length. S. fasciatus (Bloch) 

 4b. Posterior canine on each side of lower jaw; orbital tentacle simple, 

 single; nuchal cirrus present or absent; anal rays 11,19 to 21; dorsal 

 rays XIII, 18 to 20. 

 6a. No dark spot on dorsal membrane between first 2 spines; nuchal 

 cirrus absent; background coloration of males plain light brownish 

 to tan on body and head, w ith dorsal, anal, and caudal fins dusky 

 to blackish, sides sometimes with 7 or 8 vertical darkish bars and 

 sometimes with traces of 2 short lengthwise dark lines about 

 opposite tip of pectoral fin, a very small dark spot just behind 

 eye and opposite its upper edge, another behind lower rear edge 

 of eye (both spots may be pale-centered with dark edges), and 

 another on upper part of opercle; background coloration of 

 females light tan, with 4 lengthwise black line^ on sides beginning 

 about opposite tip of pectoral fin, these breaking up into black 

 dots posteriorly, the upper 3 lines are on midsides and evenly 

 spaced, the fourth and ventralmost more widely spaced, dorsal 

 and anal fins barred with small black spots. 



I. cyanostigma (Bleeker) 



66. Coloration not as above; a black spot on membrane between first 2 



dorsal spines. 



7a. Dorsal soft rays 19 or 20, usually 20; anal soft rays 20 or 21, 



usually 21 (see table for counts), nuchal cirrus absent; female 



coloration consists of distinctly reticulated dark lines and 



about 8 vertical bars usually in the form of double lines, most 



distinct on lower sides, underside of head evenly pigmented or 



with numerous small dark spots but with no transverse dark 



bars, dorsal and caudal fins speckled with black, front edge of 



lower lip dark brown; males with sides of body plain brownish, 



some traces of dark specks on head, and spiny dorsal fin with 



