Birds of this species were common in primary forest at the three localities listed under "specimens." They travel in small, loose flocks, calling as they move through the forest. Periodic calling, interspersed with periods of silence, was characteristic of the species; vocalization of this sort may function in maintaining the unity of the well spaced flock. _=Yuhina castaniceps everetti=_ (Sharpe): Chestnut-headed Yuhina.--_Specimens_, 14: 5.5 mi. SW Tenom: [Female], December 19, 1962, MCT 3468; [Male] testis 6 x 3 mm., December 23, 1962, MCT 3512; [Male] testis 7 x 3 mm., December 23, 1962, MCT 3513; [Male] testis 6 x 3 mm., December 24, 1962, MCT 3520; [Female], December 24, 1962, MCT 3521; [Male] testis 5 x 3 mm., December 24, 1962, MCT 3523; [Male] testis 6 x 3 mm., December 24, 1962, MCT 3524; [Female], December 24, 1962, MCT 3525; [Female], December 24, 1962, MCT 3526; [Male] testis 6 x 3 mm., December 24, 1962, MCT 3527; [Male] testis 6 x 3 mm., December 28, 1962, MCT 3542; [Male] testis 6 x 3 mm., December 28, 1962, MCT 3543. I saw several flocks of this species in moss forest at a point 5.5 miles southwest of Tenom. Some were observed going into cavities in the moss, where they apparently caught insects. They sometimes did this simultaneously, in several places on the same tree. _=Yuhina zantholeuca brunnescens=_ (Sharpe): White-bellied Yuhina.--_Specimens_, 4: 12 mi. N Kalabakan: [Female], October 12, 1962, MCT 3010; sex?, November 1, 1962, MCT 3193; sex?, December 22, 1962, MCT 3500; [Male] testis 7 x 4 mm., December 23, 1962, MCT 3519. One flock of about five of these yuhinas was seen in primary forest at Kalabakan. Another small group was observed in the moss forest near Tenom. _=Tephrodornis gularis frenatus=_ Buettikofer: Hook-billed Graybird.--_Specimens_, 3: Cocoa Research Station: [Male], September 25, 1962, wing molt, MCT 2946; [Female], September 25, 1962, wing molt, MCT 2947; [Female], September 25, 1962, MCT 2948. I observed this species twice in six months on the east coast. The three collected at the research station in the cocoa were in a family group. On November 9, 1962, I saw three birds feeding at the edge of the primary forest. _=Coracina striata sumatrensis=_ (S. Mueller): Barred Graybird.--_Specimens_, 2: Tiger Estate: [Female], December 30, 1962; [Male], December 30, 1962. _=Coracina fimbriata schierbrandi=_ (Pelzeln): Lesser Graybird.--_Specimens_, 6: Cocoa Research Station: [Male] imm., 25.7 gm., July 22, 1962, MCT 2637; sex?, 29.5 gm., July 28, 1962, MCT 2676; [Male], 28.4 gm., August 5, 1962, MCT 2729; [Female], 30.0 gm., September 13, 1962, MCT 2917. 12 mi. N Kalabakan: [Female], October 25, 1962, MCT 3147. Tiger Estate: [Male], November 25, 1962, MCT 3317. This species was common at the Cocoa Research Station, most common in the cocoa, and an occasional bird was observed in the primary forest.