3'J2 SILUEIDiE. 



B. Movable mantlihular teeth not more than Gj ; band of praemaxillary teeth 

 not extending along the whole width of the mouth ; lu'ad more or less 

 rnoose above. 



1. Humeral process pointed, bearing spines; movable mandibular teeth [\G 



to 55 ; skin villose on the sides. 

 Snout longer than jiostocular part of head ; 



maxillary barbel not distinctly fringed ; 



ventral not reaching bej'ond origin of anal. 3. S. acauthoinias, Blgr., p. 400. 

 Snout not longer than postocular part of head ; 



maxillary barbel not distinctly fringed ; 



ventral reaching beyond origin of anal . 4. S. omias, Gthr., p. 401. 

 Snout not longer than postocular part of head ; 



njaxillary barbel broadly fringed ; ventral 



reaching anal 5. ^'. Inuljettl, Blgr., p. 403. 



2. Humeral process pointed, without spines. 



a. Spine of dorsal fin not serrated in front *. 



ex.. Maxillary barbel | to If times length of head. 



Snout not or but little longer than postocular })art of head, 

 t Maxillary barbel not or but feebly fringed. 



X Movable mandibular teeth 20 to 48 ; base of adipose dorsal 

 2\ to 6 times its distance from rayed dorsal. 

 § Interorbilal width not half length of head ; 24-36 movable 

 mandibular teeth ; humeral process longer than broad. 

 Inner mandibular barbel with the basal branches 

 short, with tubercular ramifications ; pec- 

 toral spine feebly serrated on outer border ; 

 ventral usually not reaching anal ; skin 



more or less villose on sides (>. S. sduill, Bl. Schn., p. 404. 



Inner mandibular barbel with the basal branches 

 short, with tubercular rainiiications ; pec- 

 toral spine moderately or strongly serrated 

 on outer border ; ventral usually reaching 



anal ; skin smooth 7. /S. </amLiensls, Gthr., p. 407. 



Inner mandibular barbel with lon^ slender 

 branches without tubercular ramifications ; 

 pectoral spine moderately serrated on 

 outer border ; .'■kin smootli 8. 5. oc'U'if,')', Blgr., p. 409. 



§§ Interoi'bital width half, or nearly half, length of head in 

 adult ; 33-48 movable mandibular teeth. 

 Ventral reaching anal, both acutely pointed ; 

 humeral process not much longer than 

 deep ; skin smooth 0. .S. /ro///.).s-//^-, VailL. p. 410. 



* Sometimes very sli,G;ht]y in S. cavdovlttatvs and >', jamftirniv.s. 



