116 BRITISH CICADA. 



yellow setffi on the tibi^, and with black claws. 

 Antennae clavate at the tips, with two minute bristles 

 at the bases of the third joint. 



Expanse, 0*40 inch, or 10*16 millimetres. 



Female, with the wings closed, milk}- grey. The 

 head and pronotnm darker. The elytra marked by a 

 broad spot across the dorsum at the apex of the claval 

 suture, or by two rounded patches. 



My first figure is from an example kindly presented 

 to me by Dr. Capron, who captured it at Shere, near 

 Guildford. The figure on Plate XXXIV. is from an 

 example given me by Mr. Douglas as I. cognatus, who 

 found more than fifty individuals feeding together on 

 Populus alha, in September, at Lewisham ; two only 

 of these were males. In the following August, and in 

 the same place, he found several males, from which 

 circumstance he gathers either that the insects are 

 polygamous, or that in the autumn '* a republic of 

 widows is formed," which must be in full vigour, since 

 their female colours are brighter and gayer than pre- 

 viously noticed. Mr. Douglas concurs in Mr. Edwards's 

 identification of Kirschbaum's I. distinguendus, which 

 last name has priority. 



Easily confounded with I. trcimdce. See Ent. Mo. 

 Mag. vol. xxii. p. 115. 



Length of body and wings, 0*18 inch, or 5*0 milli- 

 metres. 



Idiocerus tremul^, Estl. Plate XXXV., fig. 1. 



Cicada trcmidce, Estl., Act. Holm. 129, pi. 5, fig. 3, 



1796. 

 Idiocerus unifasciatus, Curt. 



,, treimdce, Flor ; Marsh.; Kirschb. ; Sahl. ; 

 Scott; Edw. pt. i. p. 118. 



Exceedingly like I. distingucndus, but the female is 

 larger. The only example I have seen is from Mr. 



