Myrsidea strobilisternata Eichler, 1956

(Figs. 1–2, 15, 18)

Type host. Lochmias nematura obscurata Cabanis, 1873 —the Sharp-tailed Streamcreeper (Furnariidae).

Female (n = 1). Habitus as in Fig. 1. Hypopharynx reduced, DHS10, 0.06 long; DHS11, 0.11 long. Gula with 5+6 setae on each side. Metanotum slightly enlarged, posterior margin rounded with 14 setae. Metasternal plate and postspiracular setae not observed. Tergites I–IV enlarged, posterior margin of tergite I damaged, tergite II rounded, III with median convexity, and IV rounded. With conspicuous median gap in each tergal setal row. Tergal setae: I, 17; II, 18; III, 23; IV, 19; V, 17; VI, 14; VII–VIII, 6. Sternal setae: II, each aster of 4 setae, posterior margin with 17 and anteriorly with at least 2; III, 27; IV, ~24; V, 32; VI, 35; VII, 26; VIII–IX with 10 marginal and 13 anterior setae. Dimensions: TW, 0.45; HL, 0.29; PW, 0.28; PSPL, 0.12; MW, 0.48; MSPL, 0.18; AWIV, 0.58; ANW, 0.20; TL, 1.53.

Male (n = 2). Habitus as in Fig. 2. DHS10, 0.05 long; DHS11, 0.98 long. Gula with 4 (rarely 5 on one side) setae on each side. Metanotum with 8 setae on posterior margin, metasternal plate with 6 setae, as in Fig. 18. Setae of femoral brush, 12–15. Metanotum and abdomen as in Fig. 10. Tergal setae: I, 11–14; II, 14; III, 15–16; IV, 14– 15; V, 12–14; VI, 10–12; VII, 10–12; VIII, 8–10. Conspicuous median gap in each tergal setal row. Postspiracular setae shortest (0.11–0.12) on III, V and VI, longer (0.18) on I, and extremely long (0.30–0.39) on II, IV, VII and VIII. Sternal setae: II, each aster of 4 setae, posterior margin with 12–13 and anteriorly with 5–6; III, 18–19; IV, 24; V, 26–27; VI, 26–29; VII, 19–20; VIII, 10. Genital sac sclerite similar to that of M. ochrolaemi (Fig. 12). Dimensions: TW, 0.39–0.40; HL, 0.28; PW, 0.26; PSPL, 0.10–0.12; MW, 0.34–0.35; MSPL, 0.14–0.15; AWIV, 0.43– 0.44; GL, 0.40–0.41; GSL, 0.07; TL, 1.23–1.24.

Material examined. Female holotype (WEC 3910a), ex Lochmias nematura obscurata, Bolivia: no precise locality, no date, B. Garlepp leg. (O. Sychra pers. comm.) deposited in MNHU. Two males and 1 nymph, ex Lochmias nematura, Peru: Cuzco, 20 km NW Pilcopata, elev. 900 m, 29 November 1985, D.H. Clayton coll., at FMNH.

Remarks. This species is unique among Myrsidea from furnariids by having a reduced hypopharynx and only 4 setae in each aster. The most distinctive characters of the male of M. strobilisternata are the shape of the metasternal plate (Fig. 18), the chaetotaxy of the metanotum (with only 8 setae on the posterior margin), and the chaetotaxy of tergites VII–VIII (Fig. 15).