32 MR. R. J. TILLYARD : LIFE-HISTORIES AND 



upper branch by fusion at the nodus had led to the gradual decay o£ the 

 useless lower branch. A very careful study of: nymphal wings might decide 

 this point, but I doubt if the evidence would be at all conclusive. The fact 

 that the apparent prolongation through the nodus is always to be found 

 associated with dense venation and generally also with pigmentation — and, 

 again, that apparent prolongations occasionally occur in teratological speci- 

 mens in the Libellulince and Corduliince, in which the wing is striated and 

 broadened (thereby causing an increase in the number of rows of cells 

 between some of the main veins) — suggests that the subcosta is not really 

 concerned in the prolongation to any greater degree than any main wing- 

 trachea may be considered to be concerned in the production of neighbouring 

 cross-veins from its smaller tracheoles. 



Two distinct species of the genus Telepldehia are known, one of which is 

 widely distributed over Eastern Australia and shows four distinct regional 

 or subspecific forms ; while the other is only known by two females from 

 S. Queensland. They are : — 



Medium to large species ; tvings with irregular brown band along 



costa ; front anvil-shaped ; -ptero&tigma elongated ; memhranule 



present. Venation fairly dense T. godeffroyi, Selys. 



Smaller and slenderer species; wings without bands; front only 



slightly anvil-shaped ; pterostigma short ; memhranule absent. 



Venation open ?'• asthenes, n. sp. 



Telephlebia godeffroyi, Selys. (Plate 3. figs. 1-5.) 



Telephlebia godeffvoiji, Selys, Bull. Acad. Belg. 1883 ; R. Martin, Mem. 

 Soc. Zool. France, 1901, p. 242 ; R. Martin, iEschnines, Coll. Selys, fasc. xix. 

 (1909) p. 141 (with figures of wings and appendages of male). 



Four very distinct forms of this species occur. As these inhabit well- 

 defined regions, and do not seem to be connected by transitional forms, I 

 have no hesitation in describing them as subspecies. Their claim to specific 

 rank cannot, however, be entertained for one moment by anyone who has 

 carefully observed and collected in the different localities, even though 

 striking differences are manifest by comparing any two of the subspecies. 

 They may be separated as follows : — 



Superior appendages of male only slightly longer than [n. subsp. 



. inferior T. godeffroyi brevicauda, 



,^ „ about twice as long as 



inferior 2. 



Front very much anvil-shaped, quite black or dark brown [^elys, 



. above T, godeffroyi godeffroyi, 



„ less anvil-shaped, pale brown with a large round 



dark spot above 3. r„_ subsp. 



(Thorax with slender humeral bands of cream-colour .... T. godeffroyi cyclops, 



„ with no humeral bands T. godeffroyi tillyardi, 

 [Campion, n. subsp. 



