TYPHLOCYBA PEUNI. 145 



membrane." The second apical areolet is '^ sessile, 

 not stalked." Styles of the male are like those of 

 Douglasi, but they are not so long. Penis appears to 

 be without appendages. 



This species also inhabits the under side of horse- 

 chestnut leaves, and it occurs with T. hippocastani in 

 October, at Lewisham. 



Typhlocyba pruni, Ediv. 

 Ent. Mo. Mag. vol. xxv. p. 158, figs, h, I. 



Male. White. Corium hyaline, with a faint fuscous 

 tinge. Style much hooked, and foot-shaped. 



One example taken on the plum (Pmnus domestica) 

 in September, near Norwich. 



Before dismissing this description of the genus 

 Typhlocyba, and the varied shapes taken by the penis, 

 it will be well to notice that Mr. T. Edwards has 

 lately extended his researches as to this organ in 

 other genera ; and chiefly from its variability in form, 

 he has named, with diagnosis, some new species (see 

 Ent. Mo. Mag. vol. xxii. p. 27). For reasons given, 

 he relinquishes the genus Limotettix in favour of 

 Fieber's Gicadida. 



About these new species I am unable to express any 

 opinion, for I have not been able to obtain specimens 

 for comparison. The figures of the penis given are 

 singular in shape. 



As to the question how far the form of the genitalia, 

 or parts of them, are sufficient to decide between a 

 species and a variety, I may state Mr. Lowne's opinion 

 (see Trans. Ent. Soc. for March 6th, 1871), who 

 thought it probable that that which appears to be 

 species sometimes originates from the early develop- 

 ment of sexual organs, before the animal has acquired 

 its adult character. 



This might be described as a kind of precocity, in the 

 contrary direction to that of the neuter or worker-bee, 

 in which, through lack of sufficiently stimulating food, 



VOL. II, h 



