Zoology. 1 NATURAL HISTORY OF VICTORIA. \Insecta. 



covers for the borer at the posterior end. Pig. 2c, posterior end of same, more highly magnified. 

 Fig. 2d, side view of borer, drawn out from the two lateral pieces of the sheath, the terminal 

 joint of which is movable to receive the enlarged end of the borer. Fig. 2e, front view of 

 borer, to show the two portions which move up and down against each other and dilate at the tip 

 with serrated edges. Fig. 3, pupa case of same, split along the back to allow the winged adult 

 to escape, natural size ; with bark, leaf, and unopened flowerbuds of the Manna — or Peppermint 

 Gum (Eucalyptus viminalis), which they frequent, showing the short peduncles and 3 flowerbuds, 

 usual in the species, with the characteristic proportions of short pedicels, calyx tubes, and 

 operculum. Fig. 3a, antenna of same, to show the difference from that of the adult. Fig. 36, 

 anterior leg, magnified. 



Plate 50, Fig. 4. 



CYCLOCHILA AUSTRALASIA (Donov. sr). 

 The Great Green Cicada. 



[Genus CYCLOCHILA (Amyot et Serv.). (Sub-kingd. Articulata. Class Insecta. Order 

 Hemiptera. Tribe Homoptera. Sect. Trimera. Fam. Cicadidse. Sect. Octicella.) 



Gen. Char. — Body not hairy. Head large, triangular ; front strong, pointed, without longi- 

 tudinal mesial sulcus. Eyes large, oval, prominent. Prothorax transverse, dilated and rounded 

 on the laterally extended sides. Mesothorax slightly notched behind. Anterior and posterior 

 wings transparent. Tarsi with 3 joints.] 



Description. — Head, body above and below, legs and veins of both pairs of 

 wings and basal disc pale-yellowish grass-green, or pale-tawny horn-brown, or 

 various irregular mixtures of these two colors. Eyes yellowish-grey; ocelli amber- 

 red, surrounded by a small black patch; membrane of both pairs of wings clear and 

 unspotted. Length (male) of head and body, 1 inch 9 lines; length of anterior 

 wing, 1 inch 11 lines ; expanse from tip to tip, 4 inches 4 lines. Length (female) 

 of head and body, 1 inch 9 lines ; length of anterior wing, 2 inches 1 line ; expanse, 

 4 inches 8 lines. Anterior thighs with two long equal conical spines, one near 

 each end, and a third small one in front near joint. Length of pupa, 1 inch 6 lines. 



Reference. — Tettigonia Australasia (Donov.), Ins. N. H. Hem., t. 2, f. 1; = 

 Cicada olivacea (Germar), Silb. Rev. ii. ; 57, 4; = Cyclochila id. (Amyot et Serv.), 

 Hist. Nat. Hem., p. 470. 



The males and females are much alike in color, but the females 

 are often larger in expanse of wings, and have the head a little 

 more acute than the males. The variation from all grass-green to 

 all pale testaceous tawny -brown is so gradual and irregular when 

 a large series is examined that there cannot be a doubt of both 

 extremes belonging to one species. The great width of the cir- 

 cularly dilated margin of the prothorax between the head and the 

 wrings is the main generic peculiarity separating this from the other 

 Cicadas, with which it agrees in most other points of structure. 



Dec. v. [ 57 ] H 



