_=Arachnothera chrysogenys harrissoni=_ Deignan: Lesser Yellow-eared Spiderhunter.--_Specimens_, 4: Cocoa Research Station: [Female], 23.5 gm., August 21, 1962, MCT 2788; [Male], April 27, 1963, ADG 68; [Male], April 30, 1963, ADG 92; [Male], May 27, 1963, ADG 113. I observed this species at Quoin Hill only once, but Garcia took three specimens at the same locality. He labels his specimens as taken in primary forest. I never saw the species there and took my one specimen in the abaca, where the bird was eating spiders, nectar, and pollen. The chief characters distinguishing this species from _A. flavigaster_ were the tuft of yellow feathers on the side of the head and the narrow eye ring in _A. chrysogenys_. _=Arachnothera affinis pars=_ Riley: Gray-breasted Spiderhunter.--_Specimens_, 27: Cocoa Research Station: [Male], 27.2 gm., August 13, 1962, MCT 2771; [Female], 22.2 gm., August 13, 1962, MCT 2772; [Female] imm., 21.1 gm., August 13, 1962, MCT 2773; [Male], 29.2 gm., August 13, 1962, MCT 2774; [Male], 27.0 gm., August 21, 1962, MCT 2791; [Male], 26.6 gm., August 21, 1962, MCT 2792; [Male], April 27, 1963, ADG 65; [Female] imm., May 1, 1963, ADG 99; [Male], June 12, 1963, ADG 126; [Male], June 20, 1963, ADG 154-B. 12 mi. N Kalabakan: [Female], October 15, 1962, MCT 3046; [Female], October 24, 1962, MCT 3139. Cocoa Research Station: [Male] testis 3 x 2 mm., November 27, 1962, MCT 3327; [Female], November 27, 1962, MCT 3328; [Female], November 27, 1962, MCT 3329; [Female], November 27, 1962, MCT 3338; [Male] testis 5 x 4 mm., November 27, 1962, MCT 3339; [Male], November 28, 1962, MCT 3363; [Female], November 28, 1962, MCT 3364; [Male], November 28, 1962, MCT 3365; [Female], November 28, 1962, MCT 3366; [Female], November 29, 1962, MCT 3390; [Male] testis enlarged, November 29, 1962, MCT 3391; [Female]?, November 29, 1962, MCT 3392; [Male], December 1, 1962, MCT 3393; [Male], December 2, 1962, MCT 3429; [Male], November 30, 1962, MCT 3442. This bird was fairly common at Quoin Hill in the abaca and wild bananas and, at Kalabakan, in primary forest. Its feeding habits are the same as those of the preceding species. The order of abundance of the spiderhunters is probably best shown by the number of each species taken: _Arachnothera longirostris_, 58; _A. affinis_, 27; _A. flavigaster_, 9; _A. chrysogenys_, 4; _A. crassirostris_, 1. _=Prionichilus xanthopygius=_ (Salvadori): Yellow-rumped Flowerpecker.--_Specimens_, 7: Cocoa Research Station: [Male] testis 5 x 5 mm., 8.9 gm., August 23, 1962, MCT 2800; [Female] largest ova 3 mm., oviduct enlarged, 10.2 gm., September 13, 1962, MCT 2910; [Female] imm., 9.7 gm., September 13, 1962, MCT 2911; [Male] testis 3 x 2 mm., 9.5 gm., September 13, 1962, MCT 2912; [Female] imm., 7.0 gm., September 14, 1962, MCT 2920; [Male] testis 6 x 4 mm., vas deferens enlarged, September 26, 1962, MCT 2966; [Male], November 27, 1962, MCT 3344.