108 BRlTIsa CICADA. 



the black tints are confined to the dorsal line of the 

 abdomen. 



Body, with wing, 0*26 inch, or 6*60 millimetres. 



Common on poplar trees. Norfolk fens. 



I. fidgidus is not unlike I. confusus, but it has 

 stronger basal marks on the scutellum, and has less 

 pronounced yellow edges to the abdominal rings. The 

 pygofer also differs in form. 



Idiocerus populi, Linn. Plate XXXI., fig. 3. 



Cicada populi, Jjinn. 



Idiocerus popidi, Flor ; Kirschb. ; Sahib. ; Edw. pt. i. 

 p. 124. 



Male. Vertex, pronotum, and scutellum, honey- 

 yellow. Part of the frons and the clypeus reddish. 

 Two dark brown elongated spots between the head 

 and the pronotum, and two smaller spots behind them. 

 Apex of the scutellum greyish. The base marked 

 with the usual triangular spots, and a deep, transverse, 

 lower depression. Elytra subopaque, pale brown, and 

 yellower towards the costa. Nervures dark brown, 

 except "the middle third and the apex of the anal 

 nerve, which is white. Hind legs brownish ; other 

 legs orange-yellow. The female sometimes is of a 

 pink colour. 



Size, with wing, 0-21 x 0-07 inch, or 5-33 x 1-77 

 millimetres. 



Feeds on the aspen, Popidus trcmula. 



This insect may be partly known from its orange- 

 yellow legs, and the deep depression on the scu- 

 tellum. 



