BY W. W. FROGGATT. 287 



October instead of burrowing into the sand crawled under the bits 

 of rotten wood on the top of the sand, and attached their cocoons 

 to them. The first two came out on 9th December, but no more 

 appeared until January 21st when some thirteen hatched out 

 during the week. The male of this species is I believe unknown; 

 all my si)ecies were females, and though there are some thirty 

 specimens among the Macleay collection duplicates they are all of 

 the same sex. 



5. Perga latreillei. 



Perga latreillei, Leach, Zool. Misc. ill. p. 116 ; Westw., P.Z.S., 

 1880, p. 372, pi. XXXVI. fig. 3. 



9. Perga spinolce, Westw., P.Z.S., 1880, p. 371, pi. xxxvi. fig. 4. 



Larvce : pale brown, more slender than usual, the posterior 

 segments tinged with dark brown. Length 14 lines. 



From this bunch of larvae, which certainly contained only one 

 species of larvae, I bred the two above species; so it is evident 

 though they are not quite alike, that P. latreillei must be the male, 

 of P. spinolce, as the specimens of P. latreillei, two in number, 

 were both males, while of the latter there were nine, all females ; 

 on turning to Westwood's Monograph I found that the female of 

 P. latreillei is unknown, and that the female only of P. sjjinolce 

 has been found. The larvse were found at Rose Bay on November 

 19th feeding on Eucalyptus corymbosa. They disa])peared a week 

 later, and finding a number of dead larvfe on the surface of the 

 sand in their jar, I removed them, and placed the jar on one side 

 thinking they were all dead. On February 15th I was surprised 

 to find a saw-fly buzzing about in the jar, and on examining the 

 contents found a mass of cocoons united together in the same 

 manner as those of P. dorsalis, about two inches beneath the 

 sand. From these cocoons were obtained nine specimens of P. 

 spinolce and two of P. latreillei. Tlie latter was originally recorded 

 from South Australia, the former from Melbourne. 



