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| inches across the 

 wings from tip to tip; the body 9 J 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 jorojects 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 (U. 

 corymbosa, E. robusta, and U. 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 



