Rev. F. I). Morice's Notes on Auxin/Han Sawfiies. 303 



Regions with one another, we proceed to compare them 

 as a whole with those of Nbtogaea, it becomes at once 

 apparent that we are dealing with far more substantial 

 differences. The line of demarcation between the two 

 groups is almost as distinct as that which separates the 

 .Mammals of the two Realms. We find, indeed, one single 

 Siricid (a Xiflnjdtm) belonging to a, genus which is repre- 

 sented by species not very dissimilar in the Oriental 

 Region, and by other species of slightly different appear- 

 ance (longer ovipositor, etc. !) in Europe, and even in Eng- 

 land ! We find also one true Sirex (manifestly imported, 

 for the natural range of this genus is exclusively Holarctic). 

 And we find. also, that one very common and mischievous 

 Sawflv. whose slimy slug-like larva is a notorious pest in 

 European and American orchards has reached, evidently 

 by unintentional and quite recent importation, both 

 Australia and New Zealand. We find lastly one small 

 insect which, though I believe it to be generically distinct 

 from anything in Arctogaea, has so many characters in 

 common with a. well-known Arctogaeic genus, that it was 

 referred to it by the late W. F. Kirby and described as 

 •• Hylotoma" apicale, n. sp. But otherwise, so far as I 

 know, Australia and Arctogaea have not a single really 

 native species, nor genus, perhaps not even one "Tribe" 

 of Sawflies in common. It is not till we reach the higher 

 category of " Subfamilies " (according to Konow's classifica- 

 tion in Genera Insectorum, etc.) that the Faunas of the two 

 Realms begin to show connection. Finding this we are 

 naturally reminded though I do not mean to say that the 

 cases are precisely parallel — of the fundamental dissimilarity 

 between the present Mammalian Faunas of Australia and 

 Arctogaea. Apart from Bats, which in all such questions 

 musl be left out of account — it is w r ell known that not only 

 have these lands no native Mammals in common, but 

 that they differ even as to the " Orders" represented in 

 them, the Mammals of Arctogaea (except one American 

 Opossum, which has spread northwards out of Neogaea) 

 being exclusively Eutherian. while those which are unques- 

 tionably native* (i. e. not importations) in Australia are 

 never Eutherian, but either Marsupials or Monotremes. 



There is, in fact " si parva lied componere magnis'' a 

 really curious and interesting parallelism in many respects 



:i: Neither the "Dingo" nor the Australian Muridae an- " un 

 questionably " rial ives. 



