_Phloeoceastes guatemalensis guatemalensis_ (Hartlaub): Guatemalan Ivory-billed Woodpecker.--Specimens (4): [Male], 40611, right testis 2 mm., left testis vestigial, 203.7 gm. (July 23), Pisté; 40612, sex? 212 gm., (July 28), and [Female], 40613, 218.1 gm. (July 30), Pueblo Nuevo X-can; [Female], 40614, 189.2 gm. (August 15), 4 km. NNE Felipe Carrillo Puerto. _Dendrocincla anabatina_ (Sclater): Tawny-winged Woodhewer.--Specimen (1): [Male], 40615, testis 2 × 1 mm., 35.7 gm., molting--5th primaries and middle pair of rectrices ensheathed (July 17), 1 km. N, 13 km. W Escárcega. _Dendrocincla homochroa homochroa_ (Sclater): Ruddy Woodhewer.--May 20 seems to be the only previous date of record for breeding in this species (Paynter, 1955a:171); our specimen extends the known season nearly three months. Specimen (1): [Female], 40616, ovary 13 × 6 mm. (ova to 2 mm.), brood patch, 35.1 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto. _Sittasomus griseicapillus_ (Vieillot): Olivaceous Woodcreeper.-- Specimens (2): [Male], 40617, juv., 11.2 gm. (July 26), Pisté; [Female], 40618, ovary inactive, 10.5 gm. (August 15), 4 km. NNE Felipe Carrillo Puerto. _Xiphorhynchus flavigaster_ (Swainson): Ivory-billed Woodcreeper.-- According to Paynter (1955a:173), indications of breeding have been observed in specimens of this species taken between March 27 and June 5. A male taken on August 15 had moderately enlarged (probably regressing) testes and was well into the molt. Specimen (1): [Male], 40619, testis 5 × 3 mm., 51.5 gm., molting--5th primaries and middle pair of rectrices ensheathed (August 15), 4 km. NNE Felipe Carrillo Puerto. _Lepidocolaptes souleyetii_ (Des Murs): Streak-headed Woodhewer.--This appears to be the second specimen recorded from the peninsula (see Traylor, 1941). Specimen (1): [Male], 40621, testis 3 × 1 mm., 26.6 gm., molting--6th primaries ensheathed, middle pair of rectrices are new (July 17), 1 km. N, 13 km. W Escárcega. _Synallaxis erythrothorax_ Sclater: Rufous-breasted Spinetail.--Specimen (1): [Male], 40622, imm. skull, 16.1 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto. _Thamnophilus doliatus_ (Linnaeus): Barred Antshrike.--Specimen (1): [Female], 40623, ovary 8 × 5 mm. (inactive), 26 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto. _Formicarius analis_ (d'Orbigny and Lafresnaye): Black-chinned Antthrush.--Specimen (1): [Male], 40624, 56.0 gm. (July 29), Pueblo Nuevo X-can. _Pachyramphus major itzensis_ Nelson: Mexican Becard.--Previous records of breeding in this species are provided by a female obtained on July 12 (Paynter, 1955a:182) and a male taken on June 9 (Paynter, 1955b). Specimen (1): [Male], 40625, testis 9 × 5 mm., 22.1 gm. (July 21), Pisté. _Platypsaris aglaiae_ (Lafresnaye): Rose-throated Becard.--All specimens have extensively worn plumage.