528 
NOTES ON CICADAS, 
I am indebted to Mr. W. F. Kirby, of the British Museum, for 
the identification of most of my species. 
Thopha saccata, Amyot (" The Double Drummer "). 
This is our largest species, measuring 5 J inches across the 
wings from tip to tip; the body 9J lines across the shoulders, and 
lower down upon the large males at the drums an inch; the 
abdomen short and rounded in the males, and coming to a sharp 
point in the females. Wings hyaline and unspotted, the nervures 
pinkish-brown with the costal lower one marked with black. 
General colour fulvus-brown, with the centre of the thorax 
marked with transverse angular black stripes, and the basal part 
of all the the abdominal segments also black. 
From the way in which his musical apparatus projects this. 
Cicada is called the "Double Drummer" by the Sydney boys; and 
the female without this development is called the "Single Drum- 
mer." This species attracts one's notice in the middle of November; 
and increases in numbers until the middle of January. They were 
not so common about the gardens, but on North Shore and about 
Manly seemed to prefer the clumps of small stunted gums (E. 
corymbosa, E. robusta, and E. resinifera), clinging to the stems, 
and flying off at the least sound. Their cry is a loud harsh note 
drawn out and shrill; when singing they do not move their bodies, 
but droop their wings down on either side. 
Cyclochila Australasia, Amyot ("The Green Monday"). 
Expanse of wings 5 inches, width across the shoulders 9 lines, 
length of body 3 inches. Wings hyaline, unspotted; nervures 
bright green, the base of the large nervures near the shoulder 
yellow tinted with carmine. The whole of the insect pale grass- 
green, but changing to a much duller colour after death. 
This is our commonest Sydney Cicada, which is found in greater 
or less numbers every season. The first was taken about the 3rd of 
November, and by the 13th all the trees in the gardens were 
covered with them; where there were no Eucalypts, they showed a 
