584 



ON THE GENUS DIPIILEBIA, WITH DESCRIPTIONS 

 OF NEW SPECIES, AND LIFE-HISTORIES. 



By R. J. TiLLYARD, M.A., F.E.S. 

 (Plates xix.-xx.) 



The genus Diphlebia forms one of a group of three closely 

 allied genera united by de Selys to form the sixth legion 

 (Amphipferi/.r) in his classification of the subfamily Colop- 

 terygince,,* — DevadaUa {Te.tranp.ura of Selys), Amphipteryx, 

 and Diphlebia (Dineura of Selys). These are from somewhat 

 widely scattered regions, Devadatta occurring in the Malay 

 Peninsula, Lower Siam, and Borneo ; Amphipteryx in Colom- 

 bia; and Diphlebia in Australia. The characters which dis- 

 tinguish the group from all other genera of the subfamily are 

 the following — No antenodals continued into, or lying in, 

 the subcostal space beyond the level of the arculus. Wings 

 petioled to near level of arculus. Upper side of quadrilateral 

 straight. Basilar space free. Cu„ distinctly curved at its 

 end. Superior appendages of male distinctly forcipate (de 

 Selys "semi-circulaires"). 



The three genera may be clearly distinguished by the fol- 

 lowing table : — 



•Bull. Acad. Royale de Belgique, 1853, pp 66-67; 1859, p. 16; 1869, p.l8. 



