338 
shorter than head. Osseous part of pectoral spine strong, 
flattened, denticulated behind, as long as or longer than dorsal 
spine. Villiform teeth in bands, those of the palate and the 
lower jaw crescent-shaped. Violet greyish, underside lighter, 
distal part of fins dark. Length 335 mm. 
Nomen indig.: Singaringan (Malay. Batavia, Palembang, 
Djambi); Ririgi (Bantam); Sengat (Benkulen). 
Habitat: Java (Batavia, Sunter!, Bekassi!, Tulung agung!, 
Tjiringin, Buitenzorg!, Perdana, Ambarawa, Kediri!, Surabaya, 
Pasuruan); Sumatra (Benkulen, Padang, Priaman, Lahat, Palem- 
bang!, Gunung Sahilan!, Taluk!, Ringat!, Djambi!, Serdang!, 
Deli); Borneo (rivers Mahakam!, Barito, Kahajan, Kapuas, 
Sambas, Baram). — Malacca, Siam. 
In rivers and lakes. 
Note. MW. cavasius has been recorded by Cuvier & Valen- 
ciennes from Java and by von Martens from Borneo. We are 
of Bleeker’s opinion, that these authors confounded specimens 
of AZ. nigriceps with M. cavasius. 
2. Macrones baramensis Reg. 
Macrones baramensis C. Tate Regan, Ann. Mag. Nat. Hist. (7) XVIII, 1906, p. 68. 
Depth of body 4?/, in the length, length of head 3*/,. Breadth 
of head 11/, in its length, its depth at occiput less than °/, its 
length, diameter of eye 5. Snout '/, the length of head, broad, 
obtuse, slightly projecting beyond the mouth. Palatine bands 
of teeth confluent with the small vomerine patch. Nasal barbel 
nearer to end of snout than to eye, '/, the length of head; 
maxillary barbel extending to the posterior end of the adipose 
fin. Head covered with smooth skin, the median fontanel 
extending to base of occipital process; occipital process 
very long and slender, 8 times as long as broad, extending 
beneath the skin to the basal shield of the dorsal spine. 
Clavicular process not reaching the middle of the pectoral 
spine. Dorsal I, 7, the spine weakly serrated behind, a little 
more than '/, the length of head; anterior branched rays °/, 
the length of head. Adipose fin much longer than base of 
anal, commencing at a distance from the dorsal, wich is equal 
to */, the length of its own base, which is equal to its distance 
from the dorsal spine. Anal 11. Pectoral spine about */, the 
length of head, with moderately strong serrae on the inner 
