Manchester Memoirs, Vol. lix. (191 5), No. 9. 7 



ever, unable to find more specimens of it at the time, and 

 it was not until 27th June that I again came across it. 

 The forms then found were (i.) the alate 9 sexupara, (ii.) 

 the apterous ? of the summer generation, and (iii.) its 

 larva. The insects are gregarious and as, I believe, is 

 always the case, each colony was found on a single leaf of 

 the birch, this being blistered in a characteristic manner 

 by their sucking. A large amount of woolly secretion 

 was deposited on the under side of the leaf about each of 



Text-fig. 2. — Hamamelistes tullgretu', Meijere. Sexupara. 

 Abnormal venation of lower wing (right side). 



the colonies. The sexupara^ of course flew away, and 

 later in the year (29.vii.14, 20.viii.14) the numbers in the 

 colonies were much reduced, but apterous ? 9 con- 

 tinued to feed on the same leaves, which towards the end 

 of August were considerably yellowed. On the 30th of 

 that month I have a note of some small yellow objects 

 in close proximity to the apterous 9 ? • These were 

 probably the young larvae of the winter generation, but 

 unfortunately I did not certainly ascertain this at the 



