_=Muscicapa caerulata caerulata=_ (Bonaparte): Large-billed Blue Flycatcher.--_Specimens_, 10: Ulu Balung Cocoa Estate: [Male], July 10, 1963, ADG 185. 12 mi. N Kalabakan: [Male], October 19, 1962, MCT 3076; [Male], October 24, 1962, MCT 3144; [Male], October 26, 1962, MCT 3160; [Female], October 28, 1962, MCT 3170; [Female], November 8, 1962, MCT 3232; [Male], November 13, 1962, MCT 3266. Oil Palm Research Station: [Female], August 12, 1963, ADG 223; [Female], August 16, 1963, ADG 244; [Male], August 19, 1963, ADG 252. This was the most common "blue" flycatcher at Kalabakan. It was recorded at Quoin Hill only by Garcia. The record by Smythies (1963:281) seems open to question as no specimen was preserved. _=Muscicapa venusta=_ Deignan: Bornean Blue Flycatcher.--_Specimens_, 6: Cocoa Research Station: [Male], September 24, 1962, MCT 2939; [Male], June 12, 1963, ADG 128. 12 mi. N Kalabakan: [Male], October 12, 1962, MCT 3014; [Male], October 19, 1962, MCT 3089. Oil Palm Research Station: [Female], August 10, 1963, ADG 218. Kinabatangan: sex?, October 15, 1963, ADG 309. The "blue" flycatcher of the Quoin Hill area was observed several times in the primary forest and primary forest edge. On July 14, 1962, I saw a male and a female of _M. venusta_ bathing in a shallow stream in the deep forest. They fluttered their wings in the water and then flew to a nearby fallen log and preened for several minutes. _=Muscicapa rufigastra rufigastra=_ Raffles: Mangrove Blue Flycatcher.--_Specimen_, 1: Tuaran: [Male], December 14, 1963, SCFC 33. _=Muscicapa dumetoria mulleri=_ Blyth: Orange-breasted Flycatcher.--_Specimens_, 5: Cocoa Research Station: [Male], 11.8 gm., July 25, 1962, MCT 2661; [Female], November 1, 1962, MCT 3198; [Male] testis 3 x 2 mm., November 11, 1962, MCT 3246; [Male] testis 5 x 4 mm., November 28, 1962, MCT 3384. 5.5 mi. SW Tenom: [Male], December 25, 1962, MCT 3531. This species was seen only in the understory of primary forest. On November 10, I watched a male and female feeding about three feet above the ground in the undergrowth. They sat on small vines and plants and darted out after insects. I never observed this species more than 20 feet above the ground. _=Muscicapa narcissina=_ Temminck: Black and Yellow Flycatcher.--_Specimens_, 2: Cocoa Research Station: [Female], November 27, 1962, MCT 3331. 5.5 mi. SW Tenom: [Male], December 20, 1962, MCT 3484. The two specimens were taken in nets in the primary forest. They cannot presently be assigned with certainty to subspecies.