Abstract
Nine new Psyllipsocus species are described and illustrated. Three species from the Greater Sunda Islands: P. hollieri sp. nov. (Indonesia: Sumatra), P. uncinatus sp. nov. (Malaysia: Borneo: Sabah), P. bauensis sp. nov. (Malaysia: Borneo: Sarawak), and six species from Thailand: P. fusciceps sp. nov., P. prominens sp. nov., P. simplex sp. nov., P. cluniopilosus sp. nov., P. bidentatus sp. nov., P. quadridentatus sp. nov. They belong to four small groups of species which are each characterized by at least one striking autapomorphy (e.g. a novel possibly proprioreceptive male abdominal organ). One of these species groups includes also P. disparunguis Lienhard, only known from the United Arab Emirates. The number of Psyllipsocus species known from the Oriental Region is herewith augmented to 26, 17 of them recorded from Southeast Asia.
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