XXVlll 



these being generally single, but occasionally confluent, and frequently 

 bearing one or more florets on the side of the gall. The galls vary much 

 in size, those on the leaves being only about three-sixteenths of an inch 

 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 there 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 infloi'escence 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 Polyhlastus Wahlbergl, 

 an Ichneumon new to Britain, taken at Ashstead. A male had previously 

 been captured by Dr. Capron. 



Mr. E. Boscher exhibited hving specimens of the two varieties of the 

 larva of Smerinthus ocellatus, and read the following note : — 



" I exhibited last October coloured drawings of Smerinthus ocellatus, 

 showing the marked difference between those feeding on Salix viminalis 

 and S. triandra (Proc. Ent. Soc. 1879, p. xliv). I have now brought for 

 exhibition some living caterpillars found feeding respectively on Salix 

 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 

 mai-ked 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 hilineata, 

 a large number of which had been found by Mr. James English near 

 Epping attached firmly to the leaves of the "tea-tree" [Lycium harharum) 



