Ognma, The Japanese Dragonfly-Fauna of tbe Family LibelluUdae. 103 



Abdomen: beautiful carmine red in the male, while reddish 

 yellow in tlie female ; segments 1,8,9 and 10 as well as the 

 under surface black ; in the male , the posterior one fifth of the 

 7*^ Segment also black, upper anal appendages are waved and 

 thickened at tips , lower appendages a little shorter than the 

 Upper , both black and hairy ; in the female vulvar scale very 

 small, bilobed into semilunar halves. 



Nom. Jap.: Shima-akane. 



Loc. : Bonin Islands (M a t s u m u r a). 

 The feature of the present species is siirely to be recognized 

 as having an affinity to some species of Arjrionoptera, though widely 

 apart from it in the structure of wings. Yet the genus Neotliemis 

 certainly has a close relation to Agrionoptera , consequently it 

 sliould be placed near the latter in the systematic arrangement. 



Hemicordulia ogasawarensis sp. nov. 



Abdomen 30 — 31 mm; bind wing 30 — 31 mm; pterostigma 

 1,8 mm. 



Male. H e a d : frontal tubercle and frons metallic bliie ; 

 face yellow, densely haired. 



Thorax: bright metallic green , reflecting some coppery 

 luster, without any markings on the sides ; wings transparent or 

 pale brown, a small yellowish patch at the base of the hind wing, 

 which extends to cubito-anal cross nervure ; membranule brown ; 

 pterostigma short, deep brownish black ; legs mostly black, only 

 coxa , trochanter and the larger part of femur in the first and 

 second pairs yellowish. 



Abdomen: slender , the basal two segments swollen like 

 a globule, the 4*^ the narrowest, from ö*'* to S*'" becoming broader ; 

 deep bluish or somewhat greenish bronzy in color, a small spot 

 on each side . of the second segment and a transverse band on 

 the posterior margin of the first segment yellow, the lateral ridges 

 of the third segment pale yellowish white , the other segments 

 without patterns ; upper anal appendages longer than the last 

 two segments, the basal one fifth slender and the rest moderately 

 stout, bent gradually döwnwards and inwards, terminated in blunt 

 tips ; lower appendages long, a little shorter than the upper. 



Female: unknown. 



Nom. Jap.: Ogasawara-tombo. 

 Loc. : Bonin Islands (M a t s u m u r a). 



Two male specimens were examined. This species seems to 

 me to have a near relation to Hemicordulia assimilis from Celebes, 

 especially in the shape of the anal appendages , but the present 

 ogasawarensis has a monotonous coloration or no such color patterns 



