gg Deutsch. Ent. Zeitschr, 1922. 



The Japanese 

 Dragonfly-Fauna of the Family Libellulidae. 



By K. Oguma, Sapporo. 

 (With Plate 2.) 



Concerning cur fundamental knowledge of the Japanese fauna 

 of dragonflies , we owe to the works of De Selys-Longchamps. 

 His first work appeared some thirty years ago under the title 

 „Les Odonates du Japon" ^) ; in this monographic list the author 

 enumerates 67 species, of which 27 are represented by Libellulidae. 

 This publication was followed by a second paper entitled „Les 

 Odonates recueillis aux iles Loo-Choo" ^), in which 10 additional 

 species are described , and of these 6 are Libellulidae, Needham, 

 Williamson , and Foerster published some studies on Japanese 

 dragonflies in several papers. Quite recently Prof. Matsumura ^) des- 

 cribes the dragonflies from Saghalin together with other insects 

 occuring on that island. An elaborate work on Libellulidae is in 

 the course of publication ^) , by which our knowledge on this 

 fauna is widely extended, though I find that many species of this 

 family are yet spared in this work. 



So far as I am aware, in these works are represented those 

 Japanese dragonflies which are hitherto known. They are 48 species 

 in number. 



At present our empire is greatly added in its area, so that 

 it is extended from the high parallel of öO*^ north to the tropic 

 Cancer, containing those various parts of locality which are almost 

 not yet explored. Among others this circumstance causes me to 

 undertake a renewed work of this insect - fauna of this vast ex- 

 tention of land with varied climates. The present paper is embodied 

 of the results so far as obtained from the study of dragonflies 

 with which I have worked during four years past. I take in 

 this paper 22 additional species , of which 9 are evidently new 

 to science. Besides I have established one new genus and two 

 new subspecies. Of the 48 species known from Japan there are 

 those which I could not obtain the specimens of the following 7 : 

 Zyxomma petiolatum, Leucorrhinia rubicunda, Leucorrhinia orientalis, 

 Trithemis aurora, Sympetrum commixtum, Sympetrum Kunckeli and Sym- 

 petrum cordulegaster. 



») Ann. Soc. Ent. Belg. XXVII. 1883. 



») Comp. rend. Soc. Ent. Belg. 1888, 



') Jour. Col. Agr. Tohok. Imp. Univ. Sapporo 1911. 



*) Coli. d. Selys-Longchamp. 190ö— 1913. 



