160 TRANSACTIONS OF THE 



spherical on upper surface, produced into a cone on under surface 

 of leaf. Each gall contains one larva of C Ulmarice, Bi^emi. Near 

 Milngavie and other localities. 



Rosa canina, L. — Folded leaflet, generally a number in sarae 

 leaf afiected; each leaflet adjacent to mid-rib becomes inflated, 

 forming one, two, or a series of partial cells, each containing one 

 larva of C. Rosce, Bremi. Mr. Traill has observed similar folded 

 leaflets formed by the same insect on R. villosa. It is common at 

 Possil Marsh, Milngavie, &c. 



Cratcegus Oxyacantlia, L. — Galls terminal, consisting of a tuft of 

 leaves twisted and curled up with strong green hairs, having red- 

 dish rounded or slightly bulbous tips, developed on both surfaces. 

 Each gall contains a number of larvse of C. Cratcegi, Winn. Com- 

 mon everywhere. 



Galium verum, L. — I have observed five distinct forms of galls 

 on this plant, all possibly the work of one species, the difierence 

 being due to its situation on the plant : (1) Situated in axil of 

 whorl, as they enlarge bending down the leaflets, varying in form 

 and figure from a small globular mass situated in axil of one of 

 leaflets, or two placed opposite to each other, to three or more 

 completely encompassing stem, divisions being indicated by more 

 or less distinct grooves; in some a flattened globular mass without 

 any trace of grooves. Several narrow slit-like depressions become 

 visible as the gall matures, which open for escape of larvse when 

 full grown. Colour pale green with reddish brown cheeks, and 

 surface granular, shining, slightly pubescent, especially in vicinity 

 of clefts. (2) Terminal ; a compact mass of ovei'lapping, more or 

 less fleshy leaves, reddish in colour. (3) A terminal spirally 

 twisted tuft of leaves. (4) A projection from the stem — some- 

 times two opposite — generally immediately above a whorl, conical, 

 laterally flattened, with apex flexed sometimes upwards, at others 

 downwards. They are monothalamous ; all those I have seen were 

 empty, but Mr. Traill has found a Cecidomyious larva in them. 

 (5) A flower bud becomes swollen and fleshy, conspicuously larger 

 than the rest in the panicle. Internally it is monothalamous, with- 

 out a trace of corolla, stamens, &c. It is not described by Mr. Traill. 

 I have taken all these galls in one bed of the plant near Craig- 

 maddie. No. 1 is formed by C. Galii, Winn. 



Galium palustre, L. — A terminal, occasionally axillary, compact 

 globular mass of altered leaves, not unlike, in external appearance. 



