204 BULLETIN 18S, UNITED STATES NATIONAL MUSEUM 



tion, is in the collection of the Museum of Comparative Zoology. No 

 other specimen is available. 



Remarks. — This species may be distinguished from other known 

 forms by the combination of a very small mouth, 34 scales in lateral 

 line, 16 circumpeduncular scales, 9 branched rays in dorsal fin, and 

 coloration. 



The fish is named for William C. Schroeder, associate curator of 

 fishes in the Museum of Comparative Zoology. 



ACROSSOCHEILUS SUMATRANUS (Weber and de Beaufort) 



LissocMlus smnatratius Weber and de BEAtTFOKX, 1916, vol. 3, p. 169, figs. 68, 69 

 (Bandar Baru, Sumatra). — Suvatti, 1936, p. 55 (Sichon, Tadi, Trang, 

 Nakon Sritamarat). 



Lissochilus hutchinsoni Fowlek, 1934a, p. 120, figs. 76, 77 (Nakon Sritamarat). 



Acrossocheilus hutchinsoni Fowler, 1939, pp. 41, 70 (Huey Yang, Trang). 



Otherwise known only from Sumatra, this species was ascertained 

 to inhabit Thailand in July 1928, when the writer collected 11 speci- 

 mens in 3 different localities in Nakon Sritamarat, Peninsular Thai- 

 land : Klong Pong, Klong Tadi, and a mountain brook at about 300 

 meters elevation on the base of Kao Luang. These specimens, from 

 5 to 14 cm. long, have 23 scales in the lateral line, 3.5 — 1 — 2 in the 

 transverse line to the base of the ventral fin, 7 in the predorsal region, 

 and 12 around the caudal peduncle, with dorsal rays iii, 9 or iv, 9. 

 The general color is silvery, with the scales of back and upper sides 

 having a dark base. A fish 14 cm. long from Klong Tadi was 

 strikingly beautiful when just taken from the water, the back and 

 sides rich silvery green, the belly white, the dorsal fin dark green, the 

 caudal yellow-green, with black tips on the lobes, the anal dusky 

 green, and the ventrals and pectorals orange. In examples of 6 cm. 

 or larger there are tubercles on pores on the preorbital and suborbital 

 areas ; smaller fish usually lack the tubercles. 



Thirteen additional specimens were taken in September 1929 in a 

 mountain stream at Sichon, and in September 1933 below a waterfall 

 on Kao Chong, near Trang, both these places in Nakon Sritamarat; 

 in these the dorsal interradial membranes are black. In August 1934 

 one specimen 8.2 cm. long was collected in Huey Melao, on Doi Hua 

 Mot, Northern Thailand, 



Examples sent to Dr. L. F. de Beaufort were found by him to exhibit 

 only minimal differences from fishes from Sumatra. 



The fish described by Fowler (1934a), as Lissochilus hutchinsoni 

 from Nakon Sritamarat is undoubtedly this species. Fowler's single 

 specimen, 14.8 cm. long, agrees well with the description of 4. 5w??ia^ran- 

 us as regards proportions, squamation, and fin rays. The only points 



