182 PROCEEDINGS OF THE 



of leaves more or less fleshy at the base. It is common in the 

 Possil district during the summer and autumn months. 



Mr J. W. H. Traill, M.A., F.L.S., describes similar galls on 

 C. glomeratum (Scot. Nat., ii., p. 31). 



Cecidomyia betulae, Kaltenhach. 



During last autumn I found the catkins of birches, in Mugdock 

 Wood and at Bishopton, inhabited by larvae of a Cecidomyia, 

 which I have no doubt is this species. I hope, however, to settle 

 the i)oint by rearing the perfect insect this spring. 



The larvae were short, dumpy, and flattened, orange in colour, 

 and very sluggish in their movements.. All were enclosed in 

 compact, egg-shaped, white cocoons, either inside a seed (a common 

 position), or in the interstices between the scales. 



Cecidomyia galii, Winnertz. 



Mr Traill (Scot. Nat., i., p. 156) recorded the galls of an 

 unknown species found upon Galium palustre, Lin. 



Similar galls, on the same plant, occur in this district, at Possil 

 Marsh and in Mugdock Wood, from which I have reared the 

 perfect insect, and find it to agree in every respect with Winnertz 's 

 description of the above species (Linnaea Ent., viii., p. 235). 



The larvae are orange, usually a number in each gall, and go 

 through their changes within it, each spinning a wdiite cocoon. 



The perfect insect emerges in August and September. 



The gall is terminal, occasionally axillary, and is a compact 

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

 the fruit of a Stellaria or other Caryophyllaceous plant. It is 

 found during the summer months. This forms another addition 

 to the list of species of the genus Galium aff*ected by C. galii. 



Cecidomyia pruni, Kaltenhach. 



In the January number of the '^ Scottish Naturalist " for the 

 present year, Mr Traill records (iv., p. 14) for Britain, and 

 describes the purse-like galls of this species on Frunus communis, 

 Huds., var. spinosa, Lin. 



I found the galls moderately common in September last year in 

 Mugdock Wood, but was too late for many larvae, only seeing 

 one solitary straggler, from which the subjoined description was 

 made. 



