Some Odonata of the genus Drepanosticta Laidlaw, chiefly from the Malay peninsula (Platystictidae)

CONTENTS Introduction...................171 Key to the males of Drepanosticta of the Malay Peninsula......172 Drepanosticta hamadryas Laidlaw — Malaya; holotype (incomplete) discussed . 173 — pan Laidlaw — Malaya; lectotype and further specimens described and figured...............174 — silenus Laidlaw — Malaya; lectotype, additional notes . . . 176 — marsyas sp. n. — Malaya...........178 — spec. indet. (= quadrata Laidlaw nec Sélys) — Peninsular Thailand.................180 — quadrata (Sélys) — Malaya; holotype and further specimens described and figured............180 — fontinalis Lieftinck — (= wheeleri Fraser, syn. nov.) — Malaya; holotype and further specimens discussed.......181 — sharpi (Laidlaw) — Malaya and Thailand; further specimens described................184 — monoceros sp. n. — Borneo...........185 INTRODUCTION While identifying an interesting collection of Drepanosticta, made by some friends and myself in the Malay Peninsula during the last few years, it soon became necessary to examine the types of previously described species lodged in various museums, most of which were insufficiently known. Through the kindness of the authorities of the British Museum (Natural History), the Institut Royal des Sciences Naturelles de Belgique at Brussels, and the Museum of Zoology, Ann Arbor, I have recently been permitted to compare