ON BORIS^EAN bUAGONFLIES. 3ll 17. Contributions to a Study o£ the Dragonfly Fauna of Borneo. — Part IV. A List of Species known to occur in the Iskud. By F. F. Laidlaw, M.A.((Jantab.), F.Z.S. [Received April 9, 1920 : Head April 21, 1920. j (Text-figures 1-4.) Index. Page I. Introduction 311 II. List of Species 312 III. Some Remarks on Geographical Distribution 341 I. Introduction. I have attempted in the following list to catalogue all species of Dragonflies which have been recorded from Borneo, or which are otherwise known to me to occur in the island. In the case of some species I have added notes that may, I hope, be of service to others who may deal with this fauna. In addition to records already available in the literature of the order O.lonata, I have been able to compile my list from the examination of the large amount of material sent me by Major J. C Moulton whilst Curator of the Sarawak Museum. Some of this material has already been dealt with, as noted in the refei'ences to literature; and Major Moultou's type specimens are, unless otherwise noted, deposited in the British Museum. Where possible, paratypes have been sent to the Sarawak Museum, I have also been able to examine a collection sent to me nearl}'' twenty years ago by Dr. 0. Hose from the Baram district. References to specimens examined deal in every case with Major Moultou's mateiial imles^, otherwise stated. His localities are in the territory of Sarawak, with the following-exceptions, which are in British North Borneo : — Mt. Kinabalu, Tampassuk (River), and Khotabelud. In order to avoid undue prolixity in the list, I have given references chiefly, if not entirely, to faunistic and systematic papers. For the Lihellulince I have thouglit it necessaiy to quote only Dr. Riss Monogi'aph of the subfamily, refeired to in the sequel as " Ris, Oat. Coll. Selys, Libell." ('Catalogue Systematique et Descript. Collections Zoologiques du Baron Edm. de Selys-Longchamps,' Fasc. ix.-xvi., Libellulinje). The publication of the Moxiograph was completed in 1919, and it contains a very full synonymy of all the Bornean species. For the GomjjMnce a,nd Chlorogomphince I give reference only to my previous paper on the group (these Proceedings, 1914, pp. 51-63, pi. i.), where citations of recent papers are to be found.