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



border o£ the wing to any extent. Anal triangle of male right-angled^ 

 strong, three- to four-celled, ending some distance above anal angle ; the 

 latter strong, right-angled. 



Front prominent, anvil-shaped. Abdomen o£ male with prominent auricles, 

 and strongly constricted at segment 3 ; that of female cylindrical, segment 9 

 carrying a strong projecting ventral shelf armed with a saw-like set of teeth 

 (Plate 8. figs. 3-4) . 



Type : Planceschna costalis, Tillyard. 



This genus is closely allied both to Telepldehia and to Aiistroceschna. From 

 Teleplilehia it differs as indicated above, also by the fused bases of the sectors 

 of arculus, and by its great size ; from Austroceschna by its anvil-shaped 

 front, great size, dense reticulation, much longer and more reticulate 

 triangles, and by its peculiar colour-scheme. 



Atjsteophlebia costalis, Tillyard. (Plate 2. figs. 1-3 ; Plate 4. fig. 2). 



Planceschna costalis, Tillyard^ Proc. Linn. Soc. N.S-W. xxxi. (1906) 

 p. 724. 



AustrocL'scJma costalis, Martin, jEschnines, Coll. Selvs, fasc. xix. (1909) 

 p. 101. 



Telepldehia racleayi, Martin, ibid. p. 142. 



Teleplilehia macleayi, Martin, Grenera Insectorum, fasc. 115 (1911) p. 22. 



The descriptions cited above all refer to the type female, for many years 

 the only known specimen of this rare insect. It is in the Australian Museum, 

 Sydney ; its locality is given as "N.S.AV.," date "about 1870," and it was 

 originally labelled " Petalura costalis " in some unknown handwriting. The 

 re-discovery of this fine insect and the successful search for its larva are of 

 sufficient interest to be given in detail, followed by a full description of both 

 larva and imago. 



Ever since the discovery of the type female (hidden away in a box in the 

 Australian Museum, whei-e it had attracted no attention), I had kept a sharp 

 look-out for this species in all my collecting-expeditions ; but without success 

 for nearly six years. In 1911, owing to ill-health, I was obliged to leave 

 Sydney with my wife and family in October, and visited the rich scrubs of 

 the Dorrigo Tableland, situated some three hundred miles north of Sydney. 

 Owing to the dry weather and heat, collecting was very disappointing, very 

 few Odonata being seen during the first three weeks. On November 16th, 

 about 5 P.M., after a very hot and trying day, my wife and I took a short 

 walk into the dense scrub close to the house at which we were staying. This 

 scrub, lying just on the south side of the town of Dorrigo, is known as the 

 " Rifle Range," and is exceedingly picturesque ; a long " riding " had been 

 originally cleared in it for rifle-practice, but this was now overgrown again, 

 and only the tracks of the woodcutters were left. Entering by a narrow 



