788 STUDIES I\ AUSTRALIAX NEUROPTEUA, vii., 



persistence and keenness in following up clue after clue fof many 

 years, I should like to take this opportunity of congratulating 

 him upon th^ fine results of his work, and of thanking him very 

 heartily for tli '. help offered to me, without which I feel quite 

 certain that neither T nor anyone else could possibly have hit 

 upon the track of such a remarkable larval form as this. 



Since Mr. Gallard first taught me how to find this larva, I 

 have discovered it in many localities around Sydney, also near 

 Wauchope on the North Coast of N.S.W., and in many places 

 in S. Queensland, including Brisbane (One-Tree Hill), Strad- 

 broke Island, Mount Tambourine, Caboolture, Caloundra, and 

 Landsborough. It probably occurs all along the Eastern Coast- 

 line of Xew South Wales and Queensland, wherever there are 

 suitable rough-barked, Myrtaceous trees for the larva to hide in. 



In the present paper, 1 propose to give a full description of 

 the egg, larva, and pupa, together with an account of the habits 

 of the larva, the spinning of the cocoon, the emergence of the 

 imago, and some details about the latter that have not yet been 

 carefully investigated. 



My thanks are due to my wife for the execution of Plate Ixxix., 

 from the living larva and pupa, in collaboration with myself. 



The Life-cycle of Psychopsis elegans (Guerin). 

 The complete life-cycle of this species occupies about two 

 years. The larva, like almost all others of this Order, has only 

 three instars, during each of which an enormous increase occurs 

 in the size of the body, the size of the head remaining constant 

 in the meanwhile. The following Table exhibits the duration of 

 each period : — 



