FRESH-WATER FISHES OF SIAM, OR THAILAND 553 



together, the bony interorbital space about 0.25 diameter of eye; 

 mouth large, oblique, the maxillary extending to a point under 

 posterior edge of eye; teeth pluriserial in both jaws, those in outer 

 row enlarged and distinctly canine; gill openings extending far 

 forward, leaving a narrow isthmus. 



Squamation : Body fully scaled to anterior part of dorsal fin, with 

 a few scales extending forward from sides to vertical from gill open- 

 ings; breast scaled; head and median predorsal area entirely scale- 

 less ; scales mostly ctenoid, becoming cycloid and smaller anteriorly ; 

 scales in longitudinal series about 78 to 80, in transverse series between 

 second dorsal and anal fins 24 or 25, circumpeduncular scales 26, 

 pectoral base unsealed. 



Fins : Dorsal rays VI-I, 10 ; first dorsal high, its anterior spine pro- 

 duced in a filament longer than eye, next 3 spines of nearly equal 

 length, shorter than head and longer than depth of body, last 2 

 spines shorter, the last 0.5 length of 4th ; second dorsal low, of nearly 

 equal height throughout, about 2 in length of head ; caudal broad and 

 acutely pointed, its length equal to head ; anal similar to second dorsal, 

 its rays I, 10 ; ventrals very long, 0.8 head ; pectorals about as long as 

 ventrals, their rays 15. 



Coloration : Body pale buff, with 8 to 10 dark green or brown ver- 

 tical or somewhat oblique cross bands of unequal width extending en- 

 tire depth of body, the first on nape, the last expanded into a large 

 round spot at base of caudal fin ; sides of head under and behind eyes 

 with numerous pale orange roundish spots in irregular arrangement; 

 basal part of first dorsal fin pale drab, distal part of first 4 membranes 

 pale orange, an ocellus larger than eye involving outer part of fourth 

 and fifth membranes and fifth spine consisting of a circular jet-black 

 center and a broad ring pale blue distally and white basally ; second 

 dorsal fin pale bluish, with a row of elliptical brown spots on basal part 

 of membranes, a median row of pale orange spots surrounded by pale 

 yellow, and a marginal row of pale yellow spots; caudal fin with pas- 

 tel tints of pale blue, pale yellow, and pale brown in irregular length- 

 wise bands ; anal fin pale yellow and gray, with a pale brown marginal 

 band and a pale brown longitudinal band near base ; ventrals purplish 

 black ; pectorals hyaline. 



Type and other specimens. — The collection of the U. S. National 

 Museum contains six specimens, 6.8 to 9.4 cm. long, from the estuary of 

 the Chantabun Kiver, Southeastern Thailand, in 1926 and 1927, of 

 which a male of 9.3 cm., taken June 14, 1926, is the type (U.S.N.M. No. 

 119572) ; paratypes, U.S.N.M. Nos. 119573-119576. Eeproduced here- 

 with is a photograph of a water color drawing made from life by 

 Luang Masya Chitrakarn. Other specimens in the National col- 

 lection are seven, 7.4 to 8.6 cm. long, taken on Koh Pa-ngan, Gulf 



