42 Transactions. — Zoology. 



I was for a long time in doubt whether this very distinct 

 species ought not to belong rather to the genus Aonidia than 

 to Aspidiotus, because I could not detect the limits of the 

 second pellicle in the female puparium. The inside of the 

 puparium is quite dark-coloured, and if the pellicle extended 

 to, or nearly to, the margin it would be much larger than the 

 adult female, and would thus indicate Aonidia. I believe, 

 however, that it is rightly placed in Aspidiotus. The con- 

 cavity of the abdomen is a feature noticeable also in A. articu- 

 latus, Morgan ; but in that species there are several terminal 

 lobes, and also a clear groove separating the thoracic from the 

 abdominal region. The concavity in A. extensus is, in fact, so 

 near to the posterior extremity that there seems to be almost 

 a "tail." 



The separation of the male from the female puparia (the 

 former on the leaves, the latter on the twigs) is not a very 

 common occurrence among Coccids, but it is fairly frequent. 

 I have mentioned it myself in Fiorinia astelice, Lecanium 

 baccatum, &c, and Mr. Newstead has observed it in Aspidiotus 

 zonatus (Ent. Mo. Mag., Dec, 1893, p. 279) and others. I 

 have some twigs of Acacia linifolia, from Hornsby, New South 

 Wales, on which are great numbers of puparia, seemingly all 

 males of some Diaspid, but I cannot detect any females 

 amongst them. 



Aspidiotus extensus seems to be certainly a distinct and 

 new species. 



Genus Aonidia, Targioni -Tozzetti. 



Signoret (Ann. de la Soc. Entom. de France, March. 1868) 

 states that this genus was established by Targioni to suit a 

 species which had till then been known as " Coccus aonidum," 

 Linn. The characters distinguishing it are — 1st, "two shields 

 superimposed " (I confess that I do not understand the mean- 

 ing of this phrase); 2nd, "a larval pellicle occupying the 

 centre of the puparium, and a second pellicle occupying the 

 whole of it." If, by two superimposed shields, Targioni means 

 that the larval pellicle overlies the second, then there is 

 nothing in that to distinguish it from Aspidiotus ; but the 

 other character, of an abnormally large second pellicle, is a 

 valid one, and, as I remarked in vol. xxiv. of our Transactions, 

 1891, p. 13, it places Aonidia in a similar relation to the other 

 genera with round puparia to that which is occupied by 

 Fiorinia in relation to those with elongated puparia. 



It would appear from Signoret that, although the insect 

 Coccus aonidum has given a base for the genus Aonidia, yet 

 there is much doubt as to what it really was. Linnaeus him- 

 self in his description compares it with Lecanium hesj)eridum > 

 and Olivier (1791) repeats this, and says that it resembles " the 



