THE AUSTRALIAN NATURALIST, 33 
Malayan region and Asia; a few have spread south or east 
into the Pacific Islands and several have invaded Southern 
Europe. Eight species are credited to the genus Apotropis, 
five of which occur in Australia, the others ranging from New 
Guinea to Hawaii. i 
If one were to make a map illustrating the range of 
the genera of locusts found in Australia, it would be found 
to form a horsehoe-like band from Africa right un and around 
Southern Asia, turning round China, Japan, the Philippines 
and down these islands through New Guinea into Australia. 
One genus of eight species, 'rigoniza, is confined to Aus- 
tralia, Tasmania and New Zealand. In the genus Gastri- 
margus, our handsome yellow winged locust determined by 
Kirby for me as Locusta danica, is now defined as (Gastro- 
margus musicus, Fabr., and this species is peculiar to Aus- 
tralia. Locusta danica ranges over Europe, Asia, Africa 
and America, but does not reach Australia. In the very 
typical genus Ohortoicetes, containing at least three of our 
most destructive plague locusts, we find eight African spe- 
cies one from: Rodriguez Island, another from Banda, one 
from New Guinea, and one doubtfully from the Sandwich 
Islands. ay 
In the Genus Oyrtacanthacris there are 75 species, most 
of which are large, powerful-flying insects. Four of these 
occur in Australia, many are found all over the mainland 
of Africa and Asia, but a number are confined to isolated 
islands in the Malay Archipelago and the Indian Ocean, New 
Hebrides and New Guinea. 
NOTES AND COMMENTS. 
Preparinc Fieas ror Movuntinc.—For purposes of 
mounting, fleas. should be killed in weak spirit; a 
40 per cent. solution is strong enough and they may 
remain in it for an indefinite period. From the spirit they 
should be transferred to a 10 per cent. solution of caustic 
potash till cleared ; the time required for clearing is variable, 
24 hours sufficing for some species, while others may require 
from three days to a week. From the caustic potash they 
should be placed in several changes of water. In all phases 
of mounting it is essential that distilled water should be used, 
as the aquatic organisms are very noticeable urder the high- 
power lenses. Having been thoroughly washed, the specimen 
is placed in glacial (concentrated) acetic acid for 12 hours. 
After the acid they require as many changes of water as 
