. Bulletin - United States National Museum. Science. 416 BULLETIN 188, UNITED STATES NATIONAL MUSEUM lected also in both the upper and the lower reaches of the Menam Bang- pakong. A specimen, cm. long, taken in June 1923 in the Menam Chao Phya at Pakret, a short distance north of Bangkok, was com- pared, in December 1927, with Bleeker's type of H. horneensis, cm. long, in the British Museum and found to agree perfectly. The maximum length in local waters somewhat exceeds 25 cm. Fully mature specimens of both sexes are found from 15 cm. Figure 93.—Hemipimelodus horneensis (Bl
. Bulletin - United States National Museum. Science. 416 BULLETIN 188, UNITED STATES NATIONAL MUSEUM lected also in both the upper and the lower reaches of the Menam Bang- pakong. A specimen, cm. long, taken in June 1923 in the Menam Chao Phya at Pakret, a short distance north of Bangkok, was com- pared, in December 1927, with Bleeker's type of H. horneensis, cm. long, in the British Museum and found to agree perfectly. The maximum length in local waters somewhat exceeds 25 cm. Fully mature specimens of both sexes are found from 15 cm. Figure 93.—Hemipimelodus horneensis (Bleeker). Drawn by Nai Chote Suvatti; courtesy of the Thailand Government. The ovaries develop bilaterally, and in conjunction therewith a peculiar pad forms on the inner side of each ventral fin, as in Tachy- surus. There is no modification of the ventral fins in the male. The fully mature ovaries occupy so large a part of the abdominal cavity that the passage of food along the intestines is interfered with or altogether stopped by. the time the large, clear, amber-colored eggs are ready for extrusion. Some ripe fish taken in a haul seine March 29, 1928, were to cm. long, had dull reddish gray back and sides, and showed a glistening white spot, smaller than the pupil, in the median cranial fontanel. The fish is caught in considerable quantities with seines, bag nets, and other apparatus, and appears regularly in the markets of the larger river towns. The common vernacular name is pla uk, in allusion to the grunting noise the fish makes when caught. Qualifying terms are added in certain localities or for certain color or other peculiarities, such as pla uh deng (deng, red), pla uk khao {khao, white), and pla uk khem {khem, needle). A name heard only on the Bangpakong River is pla kot poh^ kot being equivalent to uk and poh being the kind of trap in which caught. • HEMIPIMELODUS VELUTINUS Weber Hemipimelodus velutinus Webee, 1908, p. 225 (New Guinea). Hemipimelodus M
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