326 The Scottish Naturalist. 



blister-galls rather frequent in the leaflets of the Ash 

 (Fraxinus excelsior) ; often three or four occurred on 

 each leaflet. They were lenticular in form, being circular 

 in outline when seen from either surface, and like a very 

 low cone on the upper, but nearly flat on the lower 

 surface. At first pale green, and about 4 or 5 mm 

 across, they, after a short time, dried up, became brown, 

 and seemed to increase in size, since the surrounding 

 tissue also dried up. In the cell, formed by separation 

 of the tissues, lived one whitish larva (apparently of a 

 Cecidomyia) ; but most of the galls were empty, the 

 larvse evidently pupating in the ground ; and I did not 

 succeed in rearing insects. 



Veronica Chamaedrys (Germander Speedwell). Very com- 

 monly, in all localities from which I have records, has the 

 terminal buds much swollen with imbricated leaves, 

 covered with reddish-grey woolly hairs. The galls appear 

 to be the work of mites ; but between the leaves live 

 several yellow larv?e of Cec. Veronica Bremi (T.S.X.. 158, 

 T.A., I., 67, B.I., 161). 



V. serpyllifolia (Thyme-leaved Speedwell) and V. officinalis 

 (Officinal S.), both often have the flower-buds rendered 

 fleshy, and swollen to twice or thrice the natural size ; 

 they do not open, but are quite green, or a little paler than 

 natural. The inner organs of the flowers are useless to 

 the plants for reproduction. In each flower live one or 

 more yellow or orange larvae of Cecidomyia. I have 

 these galls only from near Aberdeen (T.S.N., IV., 170, 

 New Ser., f., 216; T.A., I., 67.) 



V. SClltellata (Marsh Veronica). On this plant, in a reedy 

 swamp in the margin of the Corbie Loch, a few miles 

 north of Aberdeen, in the end of August, I found flower- 

 buds enlarged and distorted as in the two last-mentioned 

 species of Veronica, and doubtless the work of the same 

 species of Cecidomyia. The terminal buds of a few of 

 the shoots were also galled, so as to look much like 

 those described above on Hypericum pulchrum. No 

 doubt they also were the work oi the same insect. 



Rhilianthus Crista-G-alli (Yellow Rattle) is apt to become 

 stunted, and to have the leaves twisted and crowded ; 



