(Cr xxv, 4) 
known by the unique examples in the Dublin Museum, and 
the three published figures of these were materially different 
from each other. A comparison of the series exhibited 
showed the two species to be abundantly distinct. 
Mr. Kirkaldy exhibited fifty specimens of Notonecta glauca, 
Linn., to show the extreme range in size and colour of this 
species, to which the Palearctic N. lutea, Mull., was ex- 
tremely closely allied, if not conspecific with it. The 
distribution of N. glauca was very extensive and included 
practically the whole of Europe, Palearctic Africa, Teneriffe, 
Western Asia, Siberia, the Himalayas, and North America, 
the exhibitor observing that a Brazilian species was probably 
an extreme variety of this insect. 
Discussion on Mimiery, ete. 
Tae discussion on Mimicry and Homeochromatism in 
Butterflies, adjourned from May 5, was then resumed. 
Dr, Dixry: He wished to add his voice to the chorus of 
approval and thanks which had greeted the very fine exhibit 
arranged by Mr. Blandford from the collection of Messrs. 
Godman and Salvin. ‘He thought that his own views were 
supported by the contents of the drawers shown, and that the 
series of examples contained therein were, in most instances, 
Millerian associations of an extensive character. 
He agreed that the term ‘ homcochromatism”’ had an 
advantage in merely denoting the facts, without reference to 
any theory ; but he thought that Mr. Blandford ought not to 
restrict it, if such were his intention, to Millerian mimicry. 
It was equally true that Batesian mimics were homceochro- 
matic with the models they represented. 
He was not sure whether Mr. Blandford intended his 
remarks about the intimate resemblance existing between 
certain species included in these groups to be considered as a 
criticism of the Miillerian theory. The course taken by any 
species was a resultant of the various forces acting upon it, 
and the perfection of a mimetic resemblance would therefore 
stand in relation to the facility for its acquisition which was 
allowed by the other forces tending to modify the external 
appearance. 
