Oguma, The Japanese Dragonfly-Fauna of the Family Libellulidae. 101 



Male. Color and form very similar to the typical form of 

 phaon , but the size much smaller and pterostigma far shorter 

 than that of the type. 



F e m a 1 e. Color and form like that of dispar form of phaon, 

 biit the wing without brown transverse bands near the pterostigma. 

 Nom. Jap.: Hime-kofuki-tombo. 

 Loc. : Formosa (Matsumura). 



Three males and one female came under my notice. The 

 female may sometimes be of an aberrant nature as the dispar 

 form against the typical phaoii , and subsequently the typically 

 formed female of the present subspecies may have the similar 

 coloration to that of the male. The decision of the matter will 

 be postponed in further investigations. 



Lyriothemisflava sp. nov. 



Abdomen cf 31 mm, $ 32 mm; bind wing cf 36 mm, $ 37 mm ; 

 pterostigma cf ? 37 mm. 



Male. Head: frontal tubercle metallic green, the remaining 

 parts bright yellow, except the middle lobe of labium that is black. 



Thorax: yellow, with two broad black bands on the side, 

 one of them runs from just behind scapula to the second coxa 

 and the other along the second lateral suture ; the frontal part, 

 or the part betAveen the first pair of these bands being darker. 

 W i n g s faintly colored with brown ; n e r v u r e s black ; ptero- 

 stigma long and blackish. 



Abdomen: very broad, like that of L. elegantissima, bright 

 orange-yellow, a median dorsal carina and the last two Segments 

 black , though being paler towards the center of the segment ; 

 genital hamules very conspicuous , quadrilateral in shape ; upper 

 anal appendages stout, as long as the 9'** segment, black, on the 

 ventral side with 5 or 6 teeth near the tip ; lower appendage 

 nearly the same in length with the upper , yellow , margined 

 with black. 



Female. Very like the male in coloration and in form, espe- 

 cially in head and thorax. Wings much darker, abdomen scarcely 

 tapered at least up to the 8*^' segment, the black streaks on the 

 dorsal carinae broader than in the male. Vulvar scale small. 

 bilobed, either one of the lobes somewhat lunar shaped. 

 Nom. Jap.: Kiiro-harabira-tombo. 

 Loc: Formosa (Matsumura). 



As to be seenfrom the above descriptions this species has 

 a close resemblance to L. viagnificata, which has been known from 

 Malacca, especially in the structure of the genital hamules. The 

 following points, however, will deserve for the distinction of the two. 



