284 NOTES ON THE LIFE-HISTORY OP CERTAIN SAW-FLIES, 



cell in which the last moulted larval skin is left, and this is 

 partitioned off from the main chamber in which the metamorphosis 

 is undergone by a lid i:)erforated with numerous fine passages. 

 The perfect insects of species which construct aggregates of cocoons 

 emerge at this end, but those of species forming isolated cocoons 

 make their exit through the side of the cocoon. 



The following seven species have been bred by me from larvae 

 kept at Elizabeth Bay. 



1. Perga dorsalis. 



Perga dorsalis, Leach, Zool. Misc. (1817) III. p. 117, $ ; 

 Westw. P.Z.S. 1880, p. 262; Kirby, B.M. List of Hymen. (1882), 

 L p. 18. 



9. P. scutellata, West, in Griff. Anim. King. Ins. pi. 76, fig. 2, 

 and pi. 106, fig. 3, Vol. II. pp. 402, 792. 



P. eucalypti, Benn. & Sc. P.Z.S. 1859, p. 209 (Annulosa), 

 pi. 62 [$ and larva;] ; Westw. P.Z.S. 1880, p. 362. 



This is our largest and most common species, and it has a very 

 wide range, having been recorded from Tasmania, South Aus- 

 tralia, Victoria, New South Wales, and Moreton Bay. Leach's 

 type is in the Macleay Museum. 



Larvae, : black, covered with short white hairs from the eyes to 

 the tail, the thick squamose legs and last two segments of the 

 abdomen yellow. Length, 2^ inches. 



On the 9th November I found a large cluster of larvae feeding on 

 Eucalyptus obtihsifiora, at Botany ; I placed them in a jar next 

 morning, and on the following day found they had all retired 

 from sight under the sand ; they formed their cocoons, which 

 are made of a tough leathery dark brown substance, in a mass 

 side by side, the heads all facing the same way, just covered 

 beneath the sand. They remained in the chrysalid state until 

 the 25th of February of this year ; of twelve specimens that 



