490 THE ZOOLOGIST. 
long, whilst the axillary ones are from about three-eighths to half an inch 
in length, and those on the flowers of intermediate size. The width is also 
variable, and depends on the condition of the gall; in the normal state it is 
about three-quarters of the length, and the gall is bell-shaped, swollen at 
the base and more or less contracted above, but again spreading at the upper 
extremity, which is prolonged into several pointed segments, giving the gall 
much the appearance of a miniature seedhead of Aquilegia in reversed 
position. The gall is depressed in the centre between three segments, 
where it is also covered with white downy hairs. The colour is green, in 
some cases turning to purple towards maturity. Internally it is fleshy and 
solid, with one cavity in the middle of the most typically formed galls, but 
from their distortion and confluence thére may be more. In some of the 
specimens this chamber communicates by an aperture with the downy 
depression above, and contains a brilliant orange or scarlet larva, much 
resembling that of a Cecidomyia; whether it is of that genus remains to be 
seen, as apparently the gall and its tenant are as yet undescribed. The 
specimens exhibited were found about the 24th of August on the bank of 
the Brent Canal, near Brentford, on one clump of tansy growing immediately 
above the water, and the largest numbers were in the inflorescence of a stem 
which was lying partly in the water with the flower-head a few inches above 
the surface. 
Mr. T. R. Billups exhibited a female specimen of Polyblastus Wahlbergi, 
an Ichneumon new to Britain, taken at Ashstead. A male had previously 
been captured by Dr. Capron. 
Mr. E. Boscher exhibited living specimens of the two varieties of the 
larva of Smerinthus ocellatus, and read the following note :— 
“TI exhibited last October coloured drawings of Smerinthus ocellatus, 
showing the marked difference between those feeding on Salia viminalis 
and S. triandra (Proc. Ent. Soc. 1879, p. xliv). I have now brought for 
exhibition some living caterpillars found feeding respectively on Salia 
viminalis and apple. I wish particularly to draw attention to those on the 
Salix, of which I found about a dozen feeding on the same plant, and all 
marked with brown spots. Others which I found on another species of 
Salix, in an osier-bed some little distance off, were of the ordinary bluish 
green form without the brown spots, and identical with those found on 
apples.” 
Mr. Meldola exhibited some specimens of Camptogramma. bilineata, 
a large number of which had been found by Mr. James English near 
Epping attached firmly to the leaves of the “ tea-tree” (Lycium barbarum) 
by the abdomen, in which position they had died, possibly from the effects 
of a fungoid disease. 
Mr. A. H. Swinton communicated a note on Luciola Italica.— 
R. Mexipo.a, Hon. Secretary. 
