Myrsidea meyi Valim, Price & Johnson, 2011

Myrsidea meyi Valim, Price & Johnson, 2011: 8, figs 21, 26–27, 30–32.

Type host. Syndactyla subalaris (P.L. Sclater, 1859) —lineated foliage-gleaner.

Type locality. Palo Seco, Panamá.

Material examined. Ex Syndactyla subalaris: 1♀, 1♂, Tapantí National Park, Sector Tapantí, Costa Rica (09°46'N, 83°47'W), 3 August 2009, O. Sychra & I. Literak (MMBC).

Ex Thripadectes rufobrunneus (Lawrence, 1865) —streak-breasted treehunter: 3♀, 7♂, Tapantí National Park, Sector Tapantí, Costa Rica (09°46'N, 83°47'W), 31 July and 6 August 2009, O. Sychra & I. Literak (MMBC).

Remarks. This is the first record of a chewing louse from Thripadectes rufobrunneus, as well as the first record of M. meyi from Costa Rica. Our specimens differ from the original description of M. meyi by setal counts and dimensions, as follows [data from Valim et al. (2011) are in parentheses]:

Female (n = 4). Length of dhs 10, 0.055–0.065 (0.080); dhs 11, 0.115–0.125 (0.110); ratio dhs 10/11, 0.44– 0.57 (0.72). Femur III with 13–18 (14) setae in ventral setal brush. Tergal setae: I, 6–8 (8); II, 9–11 (12); III, 11–13 (13); IV, 12–15 (14); V, 13–16 (14); VI, 13–16 (14); VII, 4–10 (8); VIII, 4 (2). Sternal setae: II, 5–6 (5) in each aster, with 13–15 (13) marginal setae between asters, 4–5 (10) medioanterior; III, 25–29 (25); IV, 27–31 (31); V, 27–31 (30); VI, 26–31 (25); VII, 19–25 (19); VIII–IX, 11–16 (12); and 9–14 (13) setae on vulvar margin. Anal fringe formed by 35–39 (31) dorsal and 34–37 (36) ventral setae. Dimensions: TW, 0.48–0.50 (0.49); HL, 0.30– 0.35 (0.34); PW, 0.29–0.31 (0.31); MW, 0.44–0.50 (0.50); AW, 0.62–0.66 (0.65); ANW, 0.24–0.26 (0.24); TL, 1.57–1.60 (1.54).

Male (n = 8). Metanotum not enlarged with 4–5 (4) marginal setae; metasternal plate with 6–8 (6) setae. Femur III with 14–16 (11–14) setae in ventral setal brush. Tergal setae: I, 4–6 (4–5); II, 8–11 (9–10); V, 10–12 (12); VI, 11–12 (10–11); VII, 6–8 (5–7); VIII, 4–5 (4). Anterior margin of sternal plate II with a medial notch. Sternal setae: II, with 11–14 (8–11) marginal setae between asters, 5 (8) medioanterior; III, 20–24 (20–22); VII, 15–17 (14–15); VIII, 6–11 (6–9; sternites VII–VIII with 0–1 medioanterior setae. Dimensions: TW, 0.44 (0.45); HL, 0.32–0.34 (0.31); PW, 0.27–0.29 (0.29–0.30); AWIV, 0.47–0.49 (0.49); GSL, 0.07 (0.06); TL, 1.30–1.35 (1.23–1.33).