10 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 79 



Fins : Dorsal large, slightly emarginate, its origin well in advance 

 of ventral base, opposite 10th scale of lateral line, the rays ii,13, 

 first branched ray about equal to depth of body; caudal deeply 

 forked, its pointed lobes longer than head ; anal rays iii,5, the long- 

 est reaching nearly to base of caudal but shorter than longest dorsal 

 ray; ventrals extending to anal; pectorals somewhat shorter, not 

 reaching ventrals. 



Color: Entii-e body and all fins except caudal and pectorals 

 uniform black ; in larger specimens the belly and under side of head 

 may be bronze ; caudal and pectorals bright orange, the color of the 

 caudal extending on the caudal peduncle and involving the last 2 or 

 3 transverse rows of scales ; in small examples a narrow whitish edge 

 to dorsal and anal. 



Figure 4. — Labeo bicolor 



Type. — A specimen 10.8 cm, long over all, 8.5 cm. to base of caudal, 

 taken November 19, 1923, in a fish chute in a small tributary of the 

 Menam Chao Phya near Paknampo, Central Siam. Cat. No. 90291, 

 U.S.N.M. 



Other specimens. — In addition to a number of specimens forward- 

 ed to foreign correspondents, the collection of the Siamese Depart- 

 ment of Fisheries contains 10 specimens taken from a small stream 

 near Paknampo November 20, 1923, and several specimens taken in 

 the Menam Chao Phya at Nontaburi in December, 1921, by Dr. 

 Malcolm Smith. 



Reuiarhs. — This fish is not uncommon in Borapet Swamp, Central 

 Siam, and in the streams leading therefrom. It is reported to be 

 very common at times at Hangkraben, above Ayuthia, and occurs 

 also in the Menam Chao Phya as far south as Bangkok. The maxi- 

 mum length appears to be about 12 cm. In the Paknampo region 

 the fish is called pla song kruang (full-dress fish). 



