This species was common in the moss forest near Tenom. The female specimen with collapsed follicles indicates that some of the birds were in breeding condition. All specimens were netted. _=Trichastoma malaccense poliogenys=_ (Strickland): Short-tailed Jungle Babbler.--_Specimens_, 17: Cocoa Research Station: [Male] testis 7 x 4 mm., 24.5 gm., July 31, 1962, MCT 2687; [Female], September 5, 1962, MCT 2874; [Female], September 24, 1962, MCT 2941; [Male], November 29, 1962, MCT 3387; [Female], November 29, 1962, MCT 3388; [Male], December 1, 1962, MCT 3400; [Female], November 12, 1962, MCT 3262. Kalabakan: [Male], November 16, 1962, MCT 3292. Cocoa Research Station: [Male], June 11, 1963, ADG 123; [Male], June 12, 1963, ADG 127; [Female], June 13, 1963, ADG 132. Ulu Balung Cocoa Estate: [Male], July 9, 1963, ADG 179; [Male], July 9, 1963, ADG 179 (_sic_). Oil Palm Research Station: [Male], August 10, 1963, ADG 219; [Male], August 12, 1963, ADG 225; [Female], August 13, 1963, ADG 236; [Female], August 23, 1963, ADG 255. This terrestrial species was common in primary forest, and occasionally in secondary forest, in low trees or around brush piles. On September 24, by "squeaking," I so aroused one bird that it ran back and forth on a limb of a fallen tree in great agitation. The specimen taken on November 12 was in heavy molt; it lacked tail feathers and the primaries were being replaced. _=Trichastoma bicolor=_ (Lesson): Ferruginous Jungle Babbler.--_Specimens_, 6: 12 mi. N Kalabakan: [Male], October 24, 1962, MCT 3143; [Female], October 26, 1962, MCT 3161; [Male], November 10, 1962, MCT 3135; [Female], November 12, 1962, MCT 3255. Oil Palm Research Station: [Male], August 12, 1963, ADG 266; [Female], August 28, 1963, ADG 269. All specimens were taken in primary forest. _=Trichastoma sepiarium harteri=_ (Chasen and Kloss): Horsfield Jungle Babbler.--_Specimens_, 6: Cocoa Research Station: [Male] testis 8 x 5 mm., 25.7 gm., July 24, 1962, MCT 2652; [Male] testis 8 x 5 mm., 28.2 gm., July 27, 1962, MCT 2668; [Male] testis 8 x 7 mm., 28.2 gm., July 31, 1962, MCT 2688; [Male], June 15, 1963, ADG 142. 12 mi. N Kalabakan: [Male] testis 8 x 5 mm., November 8, 1962, MCT 3233. Oil Palm Research Station: [Female], September 5, 1963, ADG 275. This babbler tends to inhabit secondary growth more than does _T. malaccense_ and was partly arboreal, occasionally ranging as high as 20 feet above ground. It occurred occasionally in flocks of four or five.