26 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 79 



tained 2.8 times in standard length; ventrals small, shorter than 

 pectorals, inserted well above the median line ; pectorals about equal 

 to dorsal, the spine slender and finely serrated on posterior edge. 



Color: Back and top of head rich grass green; sides and under 

 parts white; from the green color of the anterior back a tapering 

 green band extends backwards along lateral line for about half 

 length of body, and below this a shorter, broader green band extends 

 backwards and downwards; fins mostly hyaline, caudal green at 

 base, anal pinkish. 



Type. — A specimen 26.0 cm. long over all, 22.5 cm. to base of 

 caudal, taken in a cast net in the Tapi River near Bandon, Penin- 

 sular Siam, September 30, 1923. Cat. No. 90306, U.S.N.M. ; paratype, 

 90307. 



Additional specimens. — Four other specimens are referred to this 

 species: Two 14.5 and 15.5 cm. long caught in a cast net in the Sikuk 

 River, Central Siam, November 16, 1923, another 17.0 cm. long 

 taken in a seine in the Menam Chao Phya at Bang Sai, November 

 17, 1923, and a fourth 18 cm. long, in the Menam Chao Phya at Bang 

 Sai, September 12, 1924. 



Remarks. — From related species this form may be distinguished 

 by its greatly compressed form, cultrate abdomen, large eye, short 

 maxillary barbel, four patches of teeth on vomer and palatiries, 

 and very long anal with more numerous rays than in any other 

 known species. The most closely related species appears to be P. 

 fnicronenm, Bleeker, from Java, Sumatra, and Borneo, in which the 

 depth is less, the eye is smaller, the anal base is much shorter, and 

 the anal rays are iv,25 to iv,30. In P. pangasius (Buchanan), known 

 from India and Burma, and also Siam, the form is comparatively 

 slender (depth 4.6 to 5 in length), the maxillary barbels may reach 

 the pectorals, and the anal rays number only iv,26 to iv,29. 



This fish is known as j)la sanghmvad at Bandon. This name, with 

 or without qualifying adjectives, is applied in various parts of Siam 

 to other members of the genus. The additional specimens, from the 

 Chao Phya and Sikuk rivers, are also locally called pla sangkawad. 



PANGASIUS BEANI, new species 



Description. — Form rather stout, the body compressed and deep, 

 the head depressed and. very broad ; profile before dorsal fin straight 

 and markedly elevated, forming an angle of 30° with horizontal axis 

 of body; depth of body under dorsal spine 3.5 in standard length, 

 over origin of anal 4.3 in length; caudal peduncle short, its least 

 depth less than 2 in its length ; head 3.5 in standard length, its width 

 0.75 its length and more than its depth; upper surface of head 

 rugose, a shallow median groove extending from snout to base of 



