I9I9-] B, L. Chaudhuri : Fish from Burma. 273 



ostoma, Erethisies, Glypiosternon , Euglyptosternum, Pseudecheneis 

 and Sisor. 



The generic character " caudal fin being' forked " of the genus 

 Amhlyceps has to be modified. The genus was orginally founded 

 on a single species {A. mangois) with a forked tail-fin. In the new 

 species, however, as well as in A. marginatus, Giinther,' from 

 mountain streams running into the Min River, in the province of 

 Sze-chuen, China, the caudal fin is square-cut. Nor is the generic 

 character " no adhesive thoracic surface" strictly true of this new 

 species as there appears to be about thirteen loose folds of skin 

 over the posterior part of the chest continued to the anterior 

 portion of the abdominal region. These folds are likely to possess 

 some adhesive function. Instead of founding a new genus on 

 these slight differences it is considered reasonable to extend the 

 definition of A mblyceps so as to include these three closely related 

 species in the genus, which the author very graphically alluded' 

 to as '' cobitis looking siluroid." 



The head, which is depressed and is broader than high, slopes 

 rapidly down to a spatulate snout. The dorsal profile is almost 

 straight from the point of orign of the rayed dorsal fin, which is 

 small and slender, to the anterior end of the low and long adipose 

 dorsal fin; the ventral profile is, however, straight throughout. 

 The body is broad and round from behind the head to the anal open- 

 ing, posterior to which it is highly compressed. The e3'es and the 

 head are covered with soft skin; the eyes are very small and 

 are placed in the anterior part of the head with two parts of its 

 length in front and three parts behind, the interorbital distance 

 being contained about five times in the length of the head. There 

 are two nostrils on each side quite close to each other, the posterior 

 one almost reaching the front of the eye and having a barbel 

 attached to the front wall. The mouth is wide and anterior and 

 the opening is horizontal, the upper jaw being slightly- longer 

 than the lower. The teeth on the jaws are villiform, arranged in 

 the upper jaw in a broad crescentic band and in the lower jaw in 

 a straight narrow band. The margins of the lips are slightly 

 fringed in both. 



There are altogether eight barbels. The maxillary barbels 

 have flat and expanded roots with loose dilated flaps and are as 

 long as the head. The nasal and the outer mandibular barbels 

 are equal to each other, and are two-thirds the length of the head. 

 The inner mandibular barbels are about half as long as the 

 head. 



The gill openings are wide and continue up to one-third of 

 the depth of the body on the dorsal side all the way from the 

 notch below the chin in the ventral aspect; the gill membranes 

 from two sides unite in front of a slender gular plate-like structrue 

 at the middle point between the two roots of the outer mandibular 



' Pratt, To the Snows of Tibet Throtigh C/iina, p. 245, pi. ii, fi^. 

 2 Blyth, Proc. Asiat. Soc. Bengal, XXV 11, p. 2S2. 



