THE FAUNA OF SOUTH WESTERN AUSTRALIA. 
89 
Family GARYPIDAE. 
Olpium michaelseni, n. sp. — Yalgoo. 
Garypinus sp. — Ivalgoorlie. 
Family CHTHONIIDAE. 
Chthonius caecus, n. sp. — Brunswick. 
VOLUME II, Part 24. ODONATA. 
By Dr. F. Ris (Rheixau). 
Pp. 417-450, with 27 figures in the text. 
In the summer of 1906-1907, Air. R. J. Tillyard (Sydney) 
made an excursion to Western Australia, and published the results 
of his studies upon the dragon-flies collected by him. The 
author has combined these data with those of the preesnt materials 
collected in the year 1905. 
The author devotes considerable space to geographical 
reflections, based upon comparisons of the Western Australian 
fauna of dragon-flies with those of other regions, especially with 
those of the southern parts of Africa and of South America. 
These three faunas have common resemblances and differences. 
The most pure in character is the South African fauna, which 
is derived from the tropical Ethiopian fauna. Somewhat more 
complex is the fauna of southern South America. That of the 
Atlantic districts corresponds to the South African one, being 
purely a derivative of the tropical South American fauna, whilst 
the scarce Chilian fauna has besides a more recent Neotropical 
portion, a most archaic portion, chiefly isolated forms, which 
show a certain relationship with those of Australia. The fauna 
of Western Australia lastly is a pure derivative of the subtropical 
and extratropical general Australian fauna. But the latter 
itself does not correspond to the Ethiopian or the Neotropical 
fauna. It is a mixture of a very archaic portion similar to the 
Chilian one, but much richer, and a considerable lndomalayan 
portion, which rapidly decreases southwards. 
The author gives a list of all W.A. dragon-flies, with the 
addition of some species from other Australian districts. In the 
following report only those from W.A. are mentioned. 
Family C ALOPTER YGI D A E» 
No species of this family is as yet known from W.A., but 
it seems to the author probable that the typical Australian genus 
Diphlebia may prove to have Western Australian representa- 
tives. 
Family AGRIONIDAE. 
Subfamily Lestinae. 
Lestes leda, Selys. — Subiaco, Mundijong. 
