150 BULLETIN ISS, UNITED STATES NATIONAL MUSEUM 

 Genus OREICHTHYS H. M. Smith 



Oreichthys H. M. Smith, Journ. Siam Soc, Nat. Hist. Suppl., vol. 9, p. 63, 1933. 

 (Type, Oreichthys parvus H. M. Smith.) 



The genus Oreichthys was established (Smith, 1933a) for the recep- 

 tion of a little fish collected in a small brook on Kao Sabap, an exten- 

 sive mountain mass near Chantabun. The genus is close to Cyclo- 

 cheilichthys but differs in having the last simple dorsal ray nonosseous 

 and nondenticulated (as against strongly osseous and denticulated in 

 Cyclocheilichthys), the scales much fewer than in any species of 

 Cyclocheilichthys (only 23 in lengthwise series and 7 in transverse 

 series) , and the tube-bearing scales of the lateral line restricted to the 

 first 6 or 7 scales anteriorly (as against a complete lateral line in 

 CyclocheilichtJiys) . The head is marked by numerous fine rows of 

 pores, mostly in parallel groups on snout, cheeks, interorbital space, 

 and opercles, which are so markedly developed in Cyclocheilichthys. 

 There are no barbels. 



OREICHTHYS COSUATIS (Hamilton) 



Cyprlnus cosuatis Hamilton, 1822, p. 338 (Kosi River). 

 Oreichthys parvus Smith, 1933a, p. 63, pi. 2, fig. 1 (Ban Ang). 

 Oreichthys cosuatis Hoka, 1937e, p. 321, fig. 1 (India). 



Of 26 specimens of Oreichthys cosuatis taken in November and 

 December 1927 and January 1929, the largest was 3.4 cm. long, which 

 is about the maximum size known to the local mountain people. 



This is a widely distributed Indian species and apparently reaches 

 a maximum size of 7.5 cm. in that country. Very exceptionally in 

 Indian examples the lateral-line tubes extend to the twentieth scale 

 with several interruptions; but the usual number of tube-bearing 

 scales is four or five. 



Hora (1937e) concluded from a study of 6'2/;>"W'?^5 {Cahdio) cosuatis 

 Hamilton (1822, p. 338) and an examination of paratypes of Oreich- 

 thys parvus that the latter is the young. (Paratypes in the U. S. 

 National Museum collection are U.S.N.M. No. 108050.) Hora's judg- 

 ment in this matter is unreservedly accepted. 



Genus PROBARBUS Sauvage 



I'robarbus Sauvage, Bull. Soc. Philom. Paris, ser. 7, vol. 4, p. 232, 1880. (Type, 

 Probarbus jullieni Sauvage.) 



The genus Proharhue was described as new by Sauvage in 1880 and 

 was again described as new in almost identical language in 1881, the 

 latter account having a somewhat amplified description of the geno- 

 type and being accompanied by a plate. The type specimen was cited 

 as 34 and 53 cm. long in the two papers. The genus was rather inade- 

 quately defined and was not differentiated from related genera, but is 



