Specimens (9): [Female], 40472, ova to 3 mm., 45.4 gm. (July 8), [Male], 40468, testis 10 × 5 mm., 50.0 gm (July 8), [Male], 40469, testis 10 × 5 mm., 65.5 gm. (July 8), [Female], 40470, ova to 3 mm., 51.6 gm. (July 8) and [Male], 40471, testis 9 × 5 mm., 57.5 gm. (July 8), all from the vicinity of Puerto Real Isla del Carmen; [Female], 40467, 57.7 gm., (July 10), 5 km. S Chapotón; [Male], 40473, testis 8 × 5 mm., 53.0 gm. (July 17), 1 km. N, 13 km. W Escárcega; [Female], 40465, ova to 21 mm., 51.8 gm. (July 28); Pueblo Nuevo X-can; [Male], 40466, testis 8 × 4 mm., 46.6 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto. _Claravis pretiosa_ (Ferrari-Perez): Blue Ground Dove.--This species was seen only at Pueblo Nuevo X-can where a breeding pair was taken on July 29; this record extends the known breeding season by one month (see Paynter, 1955b). Specimens (2): [Male], 40475, testis 10 × 5 mm., 65.0 gm. (July 29), and [Female], 40474, ova to 9 mm., 68.3 gm. (July 29), Pueblo Nuevo X-can. _Leptotila verreauxi fulviventris_ Lawrence: White-fronted Dove.--My only records of this species are the two specimens listed below. Both birds had slightly enlarged ovaries and the one from west of Escárcega was molting. Paynter (1955a) recorded breeding from late January to late April. Specimens (2): [Female], 40476, ova to 2 mm., molting--5th and 6th primaries ensheathed (July 14), 7-1/2 km. W Escárcega; [Female], 40477, ovary 12 × 5 mm., 162 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto. _Leptotila jamaicencis gaumeri_ (Lawrence): Caribbean Dove.--Two were collected on Isla Cozumel and the several white-fronted doves seen on Isla Mujeres probably were of this species. Specimens (2): [Male], 40478, testis 9 × 5 mm., 175 gm., molting--4th primaries ensheathed (August 9), and [Female], 40479, imm., 116.7 gm., molting--2nd primaries ensheathed (August 10), 3-1/2 km. N San Miguel. _Oreopeleia montana montana_ (Linnaeus): Ruddy Quail-dove.--My only record is of a male, in full breeding condition, which extends the known breeding period almost two months. Specimen (1): [Male], 40480, testis 19 × 8 mm., 144.7 gm. (July 29), Pueblo Nuevo X-can. _Artinga astec astec_ (Souancé): Aztec Parakeet.--This species was most common in deciduous forest and scrub at Champotón, Pisté, Puerto Juarez, and especially Felipe Carrillo Puerto. Parakeets were extremely wary and only two were collected. Specimens (2): [Male], 40481, testis 3 × 2 mm., 75.0 gm., molting--extensive body molt, 8th primaries ensheathed, middle pair of rectrices are new (August 16), and [Female], 40482, ovary inactive, 72.4 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto.