802 BULLETIN IS 8, UNITED STATES NATIONAL MUSEUM 



depository of Vaillant's type, and to the Zoological Museum in Am- 

 sterdam, depository of the type of A. ver?nicularis, with the request 

 that comparison be made with the types. Dr. Frederik P. Koumans, 

 curator of fishes in the Roj^al Museum of Natural History in Leiden, 

 kindly examined the type of A. anguillaris Vaillant and also the type 

 of A. vernucidaris, sent to him from Amsterdam, and gave the results 

 of his comparisons in a letter dated July 1, 1937. The Thailand speci- 

 mens were found to agree with the type of A. anguillaris. The orig- 

 inal figure of that species (reproduced in Weber and de Beaufort) was 

 faulty in showing the insertion of the last dorsal ray above the inser- 

 tion of the last anal ray, whereas in the type the base of the last dorsal 

 ray is above the insertion of the first branched anal ray ; and no differ- 

 ences were disclosed in the types of A. anguillaris and A. vertnicidaris, 

 the latter thus becoming a synonym. 



Fowler (1934a) very properly notes that the writer misidentified as 

 Eucirrhichthys doriae specimens of this species collected in the 

 Meping at Chiengmai, in Bung Borapet, and elsewhere. 



Genus ACANTHOPSOIDES Fowler 



Acanthopsoides Fowleb, Proc. Acad. Nat. Sci. Philadelphia, 1934, p. 103. (Type, 

 AcantJiopsoides gracilis Fowler.) 



ACANTHOPSOIDES GRACILIS Fowler 



Acanthopsoides gracilis Fowler, 1934a, p. 103, fig. 55 (Chiengmai, Chiengsen). 



The type of this species, from the Meping at Chiengmai, Northern 

 Thailand was 5.4 cm. long. Numerous (66) other specimens from 

 the Meping and from the Mekong at Chiengsen were from 2.5 to 5.3 

 cm. long. The principal characters separating Acantho'psoides from 

 Acanthopsis are the iDosition of the eye in the anterior half of the head, 

 the insertion of the dorsal fin in the posterior half of the body, and 

 the origin of the ventral fins before the origin of the dorsal. A fea- 

 ture that Fowler emphasizes as distinctive is a small, round jet-black 

 spot at the base of the upper half of the caudal fin, but this spot is 

 normally present in Acanthopsis choirorhynchos (Bleeker) . 



Genus NOEMACHEILUS van Hasselt 



Noemacheilus van Hassejlt, Alg. Konst. Letterbode, vol. 2, No. 35, p. 133, 1823. 

 (Type, Noemacheilus fasciatus van Hasselt.) [Most authors working with 

 this group of fishes have spelled the name of the genus Nemachilus after 

 Giinther's amended spelling in the Catalogue of Fishes in the British Museum, 

 vol. 7, pp. 11, 347, 1868, but the original spelling by van Hasselt is Noema- 

 cheilus. — L. P. S.] 



In the forested mountains of Thailand loaches of the genus Noema- 

 cheilus abound in very small, shallow, swift, clear, cool streamlets with 



