FRESH-WATER FISHES OF SIAM, OR THAILAND 511 



A length of 12 cm. is recorded for the species, but the Thailand 

 specimens were less than half that size. 



The oblique black stripe across the lower base of the pectoral fin is 

 a characteristic feature of the fish. 



PTERELEOTRIS STIGMATURUS. new species 



Figure 102 



Description. — Elongate, slender; body and head rather strongly 

 compressed, dorsal profile from head to caudal fin nearly horizontal, 

 ventral profile slightly decurved; depth 5.2 in standard length; least 

 depth of caudal peduncle 0.5 depth of body; head 4.2 in standard 

 length, its width contained 2.5 times in its length ; mouth very oblique, 

 lower jaw projecting, maxillary extending to a point under anterior 

 margin of eye ; teeth pluriserial, small, a pair of canines behind sym- 

 physis of lower jaw; snout short, less than eye and about equal to 

 interorbital space; branchial openings separated by a broad isthmus. 



Squamation : Head scaleless ; body covered with minute, embedded 

 cycloid scales, about 100 or 115 more in longitudinal series. 



//// /f¥////r/^f. 



Figure 102. — Pureleoiris stigmaturus, new species: Type (U.S.N.M. No. 119639) 

 Drawn by Mrs. Alice C. Mullen. 



Fins: Dorsal fins well separated; first dorsal rays VI, the longest 

 0.6 length of head ; rays in second dorsal 19 or 20, the longest equal to 

 the longest in the first fin; caudal fin as long as head, its posterior 

 edge slightly emarginate; anal fin similar to second dorsal, its origin 

 slightly posterior to origin of latter, its rays 20; all rays of dorsal 

 and anal fins unbranched; ventral fins with bases close together, the 

 fins narrow, pointed, and 0.6 length of head; pectoral fins somewhat 

 shorter than head and 1.5 times length of ventrals. 



Coloration (in life) : Generally milky white; a large jet-black spot 

 on the base of the middle rays of the caudal fin ; fins otherwise plain. 

 ■ Type and paraty pes. —The type (U.S.N.M. No. 119639), 2.6 cm. 

 long, was taken in the estuary of the Chantabun Kiver, Southeastern 

 Thailand, April 5, 1930. Eight other specimens taken at the same 

 time and place are paratypes, U.S.N.M. No. 119640. 



