A new species of Habrophorula from Vietnam and an updated key to species of the genus (Hymenoptera, Apidae) by Ngat Thi Tran, Michael S. Engel, Lien Thi Phuong Nguyen

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First occurrence of the little-known genus Noteriades (Hymenoptera, Megachilidae) from Vietnam: discovery of a new species and a key to the Southeast Asian fauna by Ngat Thi Tran, Michael S. Engel, Lam Xuan Truong, Lien Thi Phuong Nguyen

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The bee genus Anthidiellum in Vietnam: descriptions of five new species and the first male of Anthidiellum coronum (Hymenoptera, Megachilidae) by Ngat Thi Tran, Michael S. Engel, Cuong Quang Nguyen, Duong Dinh Tran, Lien Thi Phuong Nguyen

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The potter wasp genus Allorhynchium from Vietnam, with descriptions of three new species and a new country record (Hymenoptera, Vespidae, Eumeninae) by Lien Thi Phuong Nguyen, Anh D. Nguyen, Ngat Thi Tran, Manh Thanh Nguyen, Michael S. Engel

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A new genus of minute stingless bees from Southeast Asia (Hymenoptera, Apidae) by Michael S. Engel, Lien Thi Phuong Nguyen, Ngat Thi Tran, Tuan Anh Truong, Andrés F. Herrera Motta

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