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head; 3V2 scales between 



L. 1. and dorsal Labeobarbus p. 147. 



2. Dorsal spine strongly denti- 

 culated; head with sensory 

 folds, 5'/2 — 7 scales between 



L. 1. and dorsal Cyclocheilichthys p. 153. 



/3/3. Postlabial groove interrupted 



in the middle, but continuous 



round corner of mouth. 



1 . Lower lip conspicuously sepa- 

 rated from jaw, which has a 

 horny covering. Horny tuber- 

 cles on snout Lissochilus p. 167. 



2. Lower lip not or only by 

 superficial furrow separated 

 from jaw which is without 

 horny covering. Snout without 



horny tubercles Ptintius p. 170. 



yy. Postlabial groove modified in 

 the middle into a pouch, as the 

 broadened lower lip is laterally 



fixed to the skin Balantiochcilus p. 205. 



BB. Skin of ventral surface of rostrum forming 

 a free pendulous rostral fold, covering 

 the base of the upper lip ; mouth con- 

 spicuously inferior. 



1. Suborbital bone covering greatest part of cheek; 

 lower jaw with symphysial tubercle; the broadly 



reflected lower lip not separated from jaw Barbichthys p. 207. 



2. Ring of suborbital bones not enlarged, lower jaw 

 without symphysial tubercle ; lower lip distinct from 

 lower jaw. 



a. Dorsal with 10 — 18 branched rays Labeo p. 209. 



b. Dorsal with 8 branched rays. 



a. Snout horizontally divided by a deep groove. Schisviatorhynchus p. 216. 



/3. Snout normal Tylognathus p. 218. 



CC. No rostral fold, skin of ventral surface 

 of rostrum continued as upper lip ; mouth 

 conspicuously inferior. 

 I. Lips broadly connected. 



a. Upper and lower lip, continuous through an 

 involuted lateral part; both lips provided with 

 small rasp-like horny tubercles. No barbels. . . Gyrinocheihts p. 224, 



