Chewing lice (Phthiraptera) from buntings, cardinals and tanagers (Passeriformes: Emberizidae, Cardinalidae, Thraupidae) from Costa Rica, with descriptions of two new species of the genus Myrsidea (Phthiraptera: Menoponidae)

Descriptions and illustrations are given for two new species of Myrsidea Waterston, 1915 from cardinals and tanagers from Costa Rica. They and their type hosts are: Myrsidea poliogasteri ex Caryothraustes poliogaster (Cardinalidae) and M. larvatae ex Tangara larvata (Thraupidae). The male of Myrsidea mitrospingi is also described. New host records are Sporophila corvina for Ricinus diffusus; Mitrospingus cassinii for Menacanthus eurysternus; Tachyphonus luctuosus for Myrsidea spizae; Euphonia gouldi for Myrsidea violaceae; and Tachyphonus delattrii for Machaerilaemus laticorpus. Records of two other louse species of the genus Myrsidea from tanagers are also discussed. This paper includes the first record of Myrsidea from members of the passerine family Cardinalidae, and a number of additional new host-louse associations.