( xxiv ) 
II. paludis, H. lucens, and II. crinanensis. He pointed out that, 
as far back as 1888, he had differentiated three species among 
the specimens usually united under the name nictitans, viz. 
Ilydroecia nictitans, a generally distributed inland species; 
Ilydroecia paludis, a paler coast species ; and Ilydroecia lacens, 
a moss and moorland species. In liis “ British Noctuae and 
their Varieties,” vol. i, pp. 58-64, he described these three 
species at length, and gave a long account of their variation. 
Recently the examination of the genitalia had proved the 
distinctness of these species and had discovered a fourth 
species, Ilydroecia crinanensis, the facies of whicli was prac¬ 
tically inseparable from II. hicens. Long series of the four 
known British species were exhibited. Mr. Tutt, then, by 
I'eference to some large, clearly-drawn diagrams, explained the 
structure of the ancillary parts on which the differentiation 
was based, and pointed out the differences in the four species 
in the structure of the harpe, corona, clasper and clavus 
respectively. He then dealt with the female' genitalia, and 
discussed the differences exhibited in the lodix and genital 
plate in the same four species. The ^ ancillary appendages 
of Ilydroecia atlanticas were then discussed, and their distinct¬ 
ness from those of the four British species demonstrated. He 
made an appeal to Fellows to try, during the coming season, 
to obtain eggs, larvae and pupae of the four British species for 
comparison, and to discover, if possible, structural differences 
in these stages, in support of those shown by the superficial 
imaginal characters and those of the ancillary appendages in 
U. nictitans, II. p)cdudis,a\\d H. lucens, but more particularly to 
detect, if possible, differentiating characters in the early stages 
of the two species II. lucens and II. crinanensis, the genitalic 
characters of which are so entirely different in both sexes 
and yet whose facial characters appear as yet practically 
indistinguishable. Excellent photographs of the genital 
organs of the four British species (both sexes) made by 
Mr. F. N. Pierce, were handed round for examination. 
The Rev. C. R. N. Burrows, to whose research the dis¬ 
covery of H. crinanensis was really due, stated that he had 
little to add to what Mr. Tutt had said ; it seemed to him 
amazing that two species showing so much difference as 
