Specimens (9): [Female], 40932, ova to 1 mm., 20.8 gm. (July 21), and [Male], 40933, testis 8 × 6 mm., 21.2 gm. (July 21), Pisté; [Female], 40930, ovary moderately active, 23.2 gm. (July 26), and [Male], 40931, imm., 22.7 gm. (July 26), 3-1/2 km. N Pisté; [Male], 40934, testis 6 × 4 mm., 24.5 gm., molting--1st and 2nd primaries ensheathed (August 14), [Male], 40935, juv. (remiges and rectrices ensheathed basally), 17.7 gm. (August 14), [Female], 40936, imm., 25.0 gm (August 14), [Female], 40937, ovary granular, 22.6 gm., molting--2nd primaries ensheathed (August 15), and [Male], 40938, testis 7 × 5 mm. (August 15), 4 km. NNE Felipe Carrillo Puerto. _Arremonops chloronota chloronota_ (Salvin): Green-backed Sparrow.-- Evidence presented by Monroe (1963) indicates that _A. chloronota_ and _A. conirostris_ are not conspecific. Specimens collected in breeding condition in July seem to be the first breeding records of this species on the peninsula. Specimens (7): [Female], 40942, ova to 3 mm., 29.6 gm. (July 11), 5 km. S Champotón; [Male], 40944, testis 10 × 6 mm., 27.0 gm. (July 14), [Male], 40943, testis 5 × 3 mm., 23.1 gm. (July 14), and [Male], 40945, testis 7 × 4 mm., 25.5 gm. (July 15), 5-{7-1/2} km. W Escárcega; sex? 40939, 22.9 gm. (July 20), 6-1/2 km. W Pisté; [Male], 40940, imm., 21.5 gm. (August 4), 4 km. WSW Puerto Juarez; [Female], 40941, 26.5 gm., extensive body molt, (August 15), 4 km. NNE Felipe Carrillo Puerto. TABLE 2. An Alphabetical List of Species of Mallophaga Removed from Birds Collected on the Yucatán Peninsula in 1962.