FRESH-WATER FISHES OF SIAM, OR THAILAND 399 



parison of Hora's description and figures with Bleeker's Pimnelodus 

 platypogonoides indicates that the differences referred to by Hora 

 perhaps may not exist. At any rate, more material is certainly needed 

 before the distinctness of G. siamensis from G. platypogonoides can 

 be satisfactorily established. 



GLYPTOTHORAX TRILINEATUS BIyth 



Glyptothorax trilineatus Bltth, 1860b, p. 154 (Tenasserim). 

 Glyptothorax laosensis Fowler, 1934a, p. 88, figs. 28-30 (Bua Tai, Chiengmai) ; 

 1939, p. 57 (Trang). 



Described from the Sittang Kiver in Burma in 1860, this species 

 has since been reported from other parts of Burma, from India, and 

 from Nepal, and in recent years it has been found in Thailand. 



This is one of the largest members of the genus. In Burma it 

 reaches a length in excess of 30 cm. The largest Thai example, from 

 Doi Angka, is 18.3 cm. long. 



Among the local members of the genus, this fish is easily recognizable 

 by its uniformly blackish brown or chestnut -brown back and sides, 

 lighter underparts, and a definite arrangement of white or pale yellow 

 longitudinal stripes ; one median dorsal, from occiput to upper base of 

 caudal fin, one from the eye or the upper end of the gill opening along 

 the lateral line to the midbase of the caudal fin, and one, the least dis- 

 tinct, from the postventral region to the lower base of the caudal fin. 



Under the name G. laosensis Fowler described as a new species a fish 

 6.8 cm. long taken in 1933 at Bua Yai, in Eastern Thailand, with a 

 paratype 5.6 cm. long taken in 1932 in the Meping at Chiengmai. Over 

 60 additional specimens 4 to 7.5 cm. long were noted by Fowler as 

 coming from a waterfall stream near Trang, Peninsular Thailand. 

 The Harvard Primate Expedition in April 1937 obtained 4 similar 

 specimens 11 to 18.3 cm. long from a tributary of the Meping on Doi 

 Angka, Northern region. 



All these specimens are identifiable as G. trilineatus and are in agree- 

 ment with a specimen 10 cm. long from the type locality in the Sittang 

 drainage, Burma, sent to the U. S. National Museum by the Indian 

 Museum in Calcutta through the courtesy of Dr. S. L. Hora, and with 

 two small specimens from the Fea collection obtained on Mount Carin 

 in the Sittang basin. The differences between Fowler's specimens and 

 those from Burma referred to by Day (1878) and Hora (1923c, p. 29) , 

 such as the presence or absence of papillae on the skin, may be due in 

 part to age; thus, while in Fowler's specimen the skin was thickly 

 covered with minute papillae and Hora in old specimens found the 

 papillae had become obliterated, in July 1940 Hora reported (in a 

 letter) that he had examined a large number of fresh specimens from 

 Assam and Burma in all of which the skin was finely papillated. 



