The Scottish Naturalist. 



but the plants otherwise look much as they do in good 

 health. Among the leaves are several larvae of Ctci- 

 domyia. These pseudo -galls are common on a moor 

 near Aberdeen, in June, but I have no other record of 

 their occurrence. (T.S.N. , II., 252 ; T.A., I., 67.) 

 Thymus Serpyllum (Wild Thyme). 



1. The tips of the branches are very commonly galled by mites, 



and form rounded masses, which are rendered conspicu- 

 ous by a thick coat of pale woolly hairs. They are 

 often tenanted also by a few orange larvae of Cecidomyia 

 ? peregrina Winn (T.S.N. , I., 158, II., 252; T.A., I., 67). 

 Abbe Kieffer (I.e., pp. 8-1 1) describes a midge, under the 

 name C. tkymicola n.sp., reared by him from terminal or 

 axillary bud-galls, the leaves in which were imbricated, 

 swollen, and covered with hairs above. These galls 

 were found in Lorraine. 



2. The galls are flower-buds, swollen to twice the natural size 



but otherwise are little altered externally. The inner 

 parts of the flower are changed and form an ovate, 

 blunt body, green, pink-tipped at the narrowed upper 

 end, and thin- walled. In each lives one orange larva 

 of Cecidomyia. The galls are not rare on Aberdeen 

 Links in July. (T.S.N., II., 252 ; T.A., L, 67.) Abbe 

 Kieffer (I.e., pp. 6-8) describes as new, under the name 

 C. Thymi, a midge reared by him from galls, found by 

 him in Lorraine, on Thymus Serpyllum and on T. Chamae- 

 drys, either as affected flower-buds, or as terminal leal- 

 buds, with the two or four leaves smaller than normally, 

 and yellowish green or reddish. I have not seen the 

 latter form in Scotland, and the flower-bud galls, though 

 much like those described by me above, do not wholly 

 agree in structure. 

 Nepeta Glechoma (Ground Ivy) has the upper surface of the 

 leaves studded with conico-cylindrical galls seldom ex- 

 ceeding 3 by i-| mm. (| by T * F inch), green, but thickly 

 covered with short greyish hairs, thin-walled, and each 

 occupied by a larva of Cecidomyia hursaria Bremi. 

 When the larvae are full-fed, the galls fall off, leaving 

 holes where they were. I have found these galls pretty 



common in autumn near Dunkeld (T.S.N. , II., 253) ; 

 and Mr. Binnie reports them from the Glasgow district 

 (B, L, 161.) 



