554 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



of Siam, in July 1931, and four, 7.1 to 8.6 cm. long, from the estuary 

 of the Chant abun River in April 1933. 



Remarks. — This is a strikingly beautiful fish known to inhabit the 

 Chantabun River and Estuary, the shores of Koh Samui, and coral 

 reefs at Koh Pa-ngan. It will no doubt be found to occur on other 

 parts of the Thai coast. 



The species resembles C. leptocephalits in general shape and color- 

 ation, especially in the dark cross bands on the body, but differs there- 

 from in having ctenoid scales, larger scales (about 78 to 80 against 

 105 in longitudinal series), and entirely different coloration and pat- 

 tern of markings of the head and fins. 



CRYPTOCENTRUS LEONIS H. M. Smith 



Cryptocentrus leonis Smith, 1931a, Py 46, fig. 21 (estuary of Chantabun River). 



The type, the only known specimen, 13.5 cm. long, was taken in the 

 Chantabun Estuary at Lem Sing (Lion Point) , in July 1928. The pe- 

 culiar physiognomy, with the eye in the anterior third of the head and 

 portruding above the dorsal profile like a Periophthalmus, together 

 with the uniform reddish brown color of the body and 8 oblique dark 

 brown stripes on the cheeks and opercles, makes the recognition of this 

 species easy. In C. wehrlei, which bears some resemblance to C. 

 Jeonis, there are 5 oblique dark stripes on the side of the head and the 

 body is marked by dark cross bands. 



CRYPTOCENTRUS LEPTOCEPHALUS Bleeker 



FiGUKE 107 



Cryptocentrus leptocephalus Bleeker, 1876 (469), p. 146 (Singapore). 



Described by Bleeker in 1876 from a single specimen, 8.3 cm. long, 

 collected at Singapore, this species has rarely been mentioned in publi- 

 cations since that time. It is a form with several striking features, 

 including minute scales, which are cycloid throughout (a condition not 

 found in other local species), and peculiar coloration, consisting of a 



'/4'At-:- 



Figure 107. — Cryptocentrus leptocephalus Bleeker. Drawn by Luang Masya; courtesy 

 of the Thailand Government. 



