The holotype is the only specimen hitherto recorded from Thailand
and apparently the single one represented in American and European colletions.
I examined the specimeris from Pitganulok (A.N.S.P. 89378 & 893?4)
and the very many from Kemarat (A.N.S.P. 894f0) recorded by FOWLER (I93?) aa ooCulter' barroni and all proved to be P. riaeroi. The only correct record of P. barroni in the ichthyological literature, besides the original desciption, is that by YIH (in WU & al., 1964) who mentions and briefly describes 2l specimenso 75.0-115.0 mm, from the Mekong drainage in Yunnan. The species range is reetricted to the upper and middle Mekong.