iFllESH- WATER FISHES OF SIAM, OR THAILAND 



231 



dorsal fin originating over base of ventrals, rays in moderate number, 

 last simple ray osseous and denticulated ; anal rays few ; base of 

 dorsal and anal fins with a scaly sheath. 



Genotype. — Papillocheilus ayuthiae^ new species. 



Similar to Laheo but with the last simple dorsal ray osseous and 

 denticulated, the branched dorsal rays in reduced number, and the 

 lips thick and papillose, • ii;^i<>(.l 



PAPILLOCHEILUS AYUTHIAE, new species 



Figure 42 



Description. — Body rather strongly compressed, depth 3 in stand- 

 ard length; caudal peduncle rather broad, its least depth 1,5 in its 

 length and 2 in head; head 3,4 in standard length, moderately com- 

 pressed ; greatest width of head 1.8 in its length ; snout without pores 

 or tubercles, rather blunt, decurved, overhanging the mouth, about 

 3,1 in head; eye equal to snout and less than the broad, flat interor- 

 hital space; a narrow annular eyelid; mouth small, inferior; lips 

 continuous, rather closely aclnate to jaws and completely covered 

 with low, round papillae; lower lip broad, with a postlabial groove 

 laterally, the broad median part continuous with the skin of the 

 isthmus; a pair of rostral and of maxillary barbels, subequal, less 

 than half diameter of eye; teeth uncinate, 5, 4, 1 — 1, 4, 5; gill open- 

 ings extending forward to under posterior edge of eyes leaving a 

 rather narrow isthmus to which the gill membranes are connected; 

 gill rakers short, wide-spaced, about 14 on lower arm of first arch, 

 with about 2 short stubs on upper arm. 



Figure il.— Papillocheilus ayuthiae, new species: Type (U.S.N.M. No. 119495). Drawn 



by Mrs. Alice C. Mullen. 



