Chewing lice of the genus Myrsidea (Phthiraptera: Menoponidae) from the Cardinalidae, Emberizidae, Fringillidae and Thraupidae (Aves: Passeriformes) from Costa Rica, with descriptions of four new species Author Kounek, Filip Author Sychra, Oldrich Author Capek, Miroslav Author Lipkova, Alexandra Author Literak, Ivan text Zootaxa 2011 3032 1 16 journal article 46326 10.5281/zenodo.278715 631bcf14-5ada-441e-8de1-816275ccc240 1175-5326 278715 Myrsidea violaceae Price and Dalgleish, 2006 Myrsidea violaceae Price and Dalgleish, 2006 : 9 . Type host: Euphonia violacea (Linnaeus) —Violaceous Euphonia . Material studied. 3 female and 3 males , ex Chlorospingus ophthalmicus , Common Bush-Tanager (Emberizidae) . COSTA RICA : Tapanti National Park, Sector Tapanti ( 09°46’N , 83°47’W ; 1200m ), 8 August 2009 , Sychra and Literak leg. Deposited in INBio (O.Sychra CR120–121) and MZM (O.Sychra CR122); 2 females and 1 male , ex Euphonia hirundinacea , Yellow-crowned Euphonia (Fringillidae) . COSTA RICA : Rincon de la Vieja National Park, Miravieja Lodge ( 10°43’N , 85°18’N ; 600m ), 19 August 2009 , Sychra and Literak leg. Deposited in INBio (O.Sychra CR129–130). Remarks. This is the first record of this species of Myrsidea from Chlorospingus ophthalmicus and the first record of a chewing louse from Euphonia hirundinacea . Our specimens differ from the description of M . violaceae presented by Price and Dalgleish (2006) by setal counts and dimensions as follows [setal counts and dimensions mentioned by Price and Dalgleish (2006) are in parentheses]: From C. ophthalmicus : Female (n = 3) . Length of head seta 10, 0.040; seta 11, 0.105–0.110; ratio10/11, 0.36–0.38. Metanotum 12–14 (9–11) marginal setae. Tergal setae: I, 10–11 (11–13). Sternal setae: II, 23 (26–32); III, 25–29 (19–23); IV, 33 (25– 32); sternites III–VII without medioanterior setae. Dimensions: TW, 0.42–0.43 (0.40–0.42); TL, 1.36 (1.39–1.48); ANW, 0.22–0.24 (0.18–0.21). Male (n = 3) . Metanotum 12 (9–11) marginal setae. Tergal setae with median gap on I–II: I, 15 (16–20). Sternal setae: III, 26 (19–25); IV, 31 (21–29); V, 32 (26–30); VI, 29 (23–28); sternites III–VII without medioanterior setae. From E. hirundinacea : Female (n = 2) . Length of head seta 10, 0.035–0.040; seta 11, 0.95–0.100; ratio10/11, 0.35–0.42. Tergal setae: I, 15 (11–13); VIII, 19 (14–18). Sternal setae: III, 24 (19–23); IV, 34 (25–32); sternites III–VII without medioanterior setae. Male (n = 1) . Tergal setae: III, 24 (25–30). Sternal setae: II, 21 (26–32); VIII, 14 (7–11); sternite III with one medioanterior seta, other sternites without medioanterior setae. Dimensions: AW, 0.38 (0.39–0.43).