334 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



1. Coloration more uniform, the very conspicuous bars of S. semi- 

 ductus entirely wanting on sides of body, as are also the brownish 

 spots present in semicinctus on back and on dorsals and caudal. 



2. The more numerous gill-rakers. 



3. The absence of spines on the contiguous angles of subopercle and 

 interopercle. 



4. The arrangement of the upper three preopercular spines, which 

 are all horizontal, the second nearer the third than the first ; in S. semi- 

 cinctus the second spine is much nearer the first than the third, and 

 the third is directed obliquely downward and backward. 



5. The presence of 6 anal rays in both type and cotype; 7 are 

 present in S. semicinctus in all the numerous specimens examined. 



Length of head, from tip of snout to end of opercular flap, 3 in total 

 length without caudal; depth, 3.7; least depth of caudal peduncle, 

 3.8 in length of head; diameter of orbit, 3.3; least interorbital width, 

 5.4; length of snout, 4.2; distance from tip of snout to end of maxil- 

 lary, 2.4; longest gill-raker half diameter of orbit. Gill-rakers, 

 13 + 30 (or 13 + 29) on outer arch. 



Dorsal, XIII, 14; anal, III, 6; pectoral, 17, the lower 8 rays thick- 

 ened and simple; pores in lateral line, 42 to 44, corresponding to the 

 oblique series downward and backward from dorsal outline. 



Body very slender, more so than in S. semicinctus, the only species 

 which approaches it in this respect. Snout sharp, the head evenly 

 tapering, the mandible strongly protruding, its tip extending beyond 

 the line of upper profile, the symphyseal teeth on a projection 

 which fits into a toothless notch above. Maxillary broad, subtending 

 slightly less than anterior half of eye. Interorbital area flat, or ren- 

 dered slightly concave by the depressed supraorbital ridges; pair of 

 inner frontal ridges very inconspicuous. Preocular and postocular 

 spines strong but low; tympanic spines low; parietal ridges narrow 

 and sharp, with low, strong spines. Upper 4 preopercular spines 

 directed backward, the fifth directed a little downward; space 

 between second and third spines shorter than other interspaces. 

 Preorbital with two rounded lobes, which fail to develop distinct 

 spines. Contiguous angles of subopercle and of interopercle without 

 spines. Two strong suprascapular spines, the lower posterior spine 

 with an additional one anterior to its base. Palatine and mandibular 

 bands of teeth very narrow, the latter widening abruptly at sym- 

 physis, where the teeth also increase in size. 



Scales strongly ctenoid, reduced in size in head and breast, and 

 along base of dorsal fins; accessory scales apparently not numerous. 

 Head entirely scaled, including snout, preorbital, maxillary, man- 

 dible, gular membrane mesially, and the branchiostegal rays. A 

 band of scales accompanies each dorsal spine; all segmented rays are 

 invested with fine scales to their tips. 



