BY R. J. TILLYARD. 771 



corded from North Gippsland (Alexandra), which do not approach 

 close enough, in their distribution, to the southern coast of that 

 State to be taken into consideration. 



Fig.3. — Post Isthmian (presknt day). 

 To these, I have added the, as yet, undescribed species from 

 Hobart (Austroceschria sp.), making a total of forty-three. 

 Dividing these into lists A and B, and including in both A and B 

 the species Austrogomphus gue'rini, which, although habitually 

 breeding in slowly running water, has occasionally been observed to 

 breed in still water, we find that list A contains twenty-four species, 

 and list B twenty. In list B, however, we have the two geminate 

 species, or rather subspecies, Synth emis eustalacta Burm., (occur- 

 ring only on the mainland) and S. tasmanica Tilly ard (occurring 



