Myrsidea barbati Price, Hellenthal and Dalgleish, new species (Figs. 9–10)

Type host. Myiobius barbatus (J. F. Gmelin), Sulphur­rumped Flycatcher.

Female. Dorsal thorax and dorsoventral abdomen as in Fig. 9. Metanotum with 6–8 marginal setae. Tergites II–III with slight medioposterior convexity. Tergal setae: I, 10– 14; II–III, 13–17; IV–V, 13–16; VI, 11–14; VII, 9–12; VIII, 8–10. Postspiracular setae on III and V–VI much shorter than very long postspiracular setae on other segments. Sternal setae: II, each aster with 4 setae, 20–27 other setae; III, 18–23; IV, 24–29; V, 28–33; VI, 24–32; VII, 11–15; VIII–IX of subgenital plate, 15–20. Anus with 25–31 setae in dorsal fringe, 24–29 in ventral. Dimensions: TW, 0.45–0.48; HL, 0.28–0.31; PW, 0.26–0.29; PSL, 0.10–0.11; MW, 0.39–0.43; MSL, 0.14–0.16; AWIV, 0.51–0.57; ANW, 0.17–0.19; TL, 1.37–1.46.

Male. Metanotum with 6 marginal setae. Tergal setae: I, 9–11; II–VI, 13–17; VII, 12– 15; VIII, 10–12. Sternal setae: II, each aster with 4 setae, 23–28 other setae; III, 16–20; IV, 20–26; V–VI, 22–28; VII, 14–17; VIII, 6, rarely 5. Genital sac sclerite about 0.07 long, as in Fig. 10. Dimensions: TW, 0.41–0.43; HL, 0.27–0.29; PW, 0.24–0.28; PSL, 0.09–0.10; MW, 0.35–0.37; MSL, 0.12–0.14; AWIV, 0.43–0.45; GL, 0.41–0.46; TL, 1.13–1.22.

Type material. Holotype female (NMNH), ex M. barbatus, COSTA RICA: San Jose Prov., Tinamaste, 12 km SW San Isidro de El General, 1 Feb 2000, Fisher & J.S. 3088. Paratypes (NMNH, TNHM, RCD), all ex M. barbatus: COSTA RICA: 1 female, 2 males, same as holotype; 2 males, same except 3085; 1 male, Monte Anvio Lodge, 13 km N Portero Grande Puntarenas, 20 Mar 1995, Fisher & J.S. 2097; VENEZUELA: 3 females, Edo. Bolivar, 60 km E Sta. Elena, Jan 1987, R. C. Dalgleish; NE PERU: 1 female, Explor Napa Camp, Rio Napa, SE Iquitos, 14 Jun 1989, R. C. Dalgleish et al 9407; BELIZE: 1 female, 1 male, Aguacate, 4 May 1979, C. Lyal & A. Hutson; 1 female, 1 male, same except 5 May 1979; 1 female, 1 male, Toledo Distr., Jimmy Cub, 24 May 1979, C. Lyal & A. Hutson.

Remarks. The male of Myrsidea barbati is readily separated from males of others of this group by its highly distinctive genital sac sclerite (Fig. 10). The female is recognized by its small number of setae on the metanotal margin, in conjunction with not>33 setae on sternites V–VI, not>32 setae in each anal fringe, and the narrow anus <0.20 wide. The small dimensions and the relative lengths of the postspiracular setae for both sexes will also separate this species from a number of the others.