BY P. W. GODING AND W. W. PROGGATT. 591 



hind border broad, ferruginous. Mesonotum varying from yellow 

 through red to black; with four obconical stripes, outer pair the 

 longer and more or less excavated, a central stripe acuminate 

 towards base broader towards apex where it unites with a large 

 spot in front of cruciform elevation, and scutellum, black; pubes- 

 cent. Tegniina vitreous, venation reddish near base, green or 

 fuscous towards tips, 1st and 2nd anastomoses infuscated, fre- 

 quently absent. Wings similar. Abdomen black, a ferruginous 

 spot near base, and an oval yellow spot on each side at middle, 

 covered with silk}^ white or yellow pubescence. Body below 

 ferruginous, abdomen variously marked with black; sides covered 

 with pubescence. Legs concolorous. Long. corp. 25-38 mm.; 

 exp. teg. 80-110 mm. 



Hab. — New Holland (Leach); Sydney (Boisduval), Tweed River, 

 N.S.W.; Kuranda, Q. 



The markings of this extremely variable species depend upon 

 the amount of colouring material deposited, while it has a wide 

 range in measurements. Some are almost entirely black, while 

 others are quite green, yet there are no structural characters in 

 the one that are not present in the other. In a long series we have 

 never seen a specimen of dichroa with the anastomoses of the 

 tegmina infuscated, yet in harrisii occasionally one is seen with 

 them not infuscated. In drawing up the above description an 

 average example was in hand. 



This cicada is found about the open forest in the vicinity of 

 Sydney, but is not common, seldom more than a pair being taken 

 at the same time. Though so very variable it is easily recognised 

 by the bright silver blotch on either side of the abdomen. 



Genus Cryptotympana, Stal. 

 1861. Ann. Soc. Ent. Fr. ser. 4, p. 613. 

 1866. Hemip. Afric. iv. p. 6. 



Body oblong. Head convex, very broad; eyes salient. Front 

 angles of jwonotuvi not covered by sides of head, often distinctly 

 prominent; lateral margins destitute of denticles. Metasternum 

 elevated in middle, and furnished with a strong posterior process 

 directed backward. Basal area of tegmina somewhat, rarely double, 



