CONTRIBUTION TO THE KNOWLEDGE OF ORIENTAL PSENULUS (HYMENOPTERA, SPHECIDAE, PSENINl) by J. P. VAN LITH Rolterdam Abstract The following new species and subspecies are described and illustrated: P. bhicalus, W Pakistan suifuensis, China; parvidentalus, Formosa; nasicornh, Celebes; bengalensis, India; nietneri, Ceylon pallidicollis, Borneo; neptunus, Celebes; pseiidajax hoitmanni, Culion and Busuanga (Philippine Is.) iriterstitialis salomonensis, Guadalcanal, Malaita, Russell Is., Kolombangara, Velia Lavella, Bougain ville (Solomon Is.); segrex, Celebes; chariis, Choiseul (Solomon Is.); äniucariiis. New Guinea lampn/s, Celebes; aniiamensis, Vietnam; hoozaniiis, Formosa; ceyloniciis, Ceylon. New records of known species are given. From various regions, particularly continental southeast Asia, Celebes and the West Pacific islands, interesting material has been received during the last few years. It con-tained many new species, or the opposite sex of forms described earlier after only one sex. This enabled me to obtain a better insight into the division of the genus into species-groups and their relationships. The more our knowledge of the species of Psenid/a increases, the stronger become grounds for the erecrtion of a number of new subgenera. The only subgenus published so far is Eopsemdus Gussakovskij, 1934, for iwdtai Guss., whilst the genus Nipponopsen Yasumatsu, 1938, was erected for anomonenrae Yas. (syn. Psenulus mandibiilar'n Tsune-ki, 1959). The new subgenera should be based mostly on the already distinguished species groups, or on combinations thereof. I hope to discuss this question in a future paper, after a study of the African and New World Psenulus. I express my gratitude to the institutions and entomologists who have sent me material. Their names are listed below together with the abbreviations as used in the present paper. BISH — • Bernice P. Bishop Museum, Honolulu BM — British Museum (Natural History), London BPIM — Bureau of Plant Industry, Manila CAS — -California Academy of Sciences, San Francisco CNC — Entomological Research Institute of the Canadian Department of Agriculture, Ottawa HUA — Hyogo University of Agriculture, Sasayama Coll. Krombein — Dr. Karl V. Krombein, Washington, D.C. MCG — Museo Civico di Storia Naturale, Genoa ML — Rijksmuseum van Natuurlijke Historie, Leiden OUM — University Museum, Oxford Coll. Pagden — Mr. H. T. Pagden, Penang, Malaya 153
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