The Scottish Naturalist. 209 



frequently in pairs along the mid-rib, or singly along the large lateral 

 nerve, where these emit branches outwards. As many as 30 or 

 40 may be seen on one leaf, but usually they are less numerous. 

 They form rounded hard knobs above, 2 or 3 mm. in diam., and 

 covered with a close coat of short pale brown unicellular simple 

 hairs. On the lower surface there stands a dense tuft of similar 

 hairs ; and on separating these one finds an opening between 

 them, leading into a hollow, from the interior of which the hairs 

 arise. The mites live between the hairs. These galls were de- 

 tected in abundance by Dr. White on the same trees as the two 

 former, near Aberfeldy, in September. They are also found in 

 Germany (Dr. Thomas in GiebeVs Zeitschr, 1869,/. 336), and in 

 Austria (Dr. Fr. Loew, in Verh. Z. B. Ges. Wien xxiv., p. 506). 

 Dr. Thomas is of opinion that the gall is the same as Amerling's 

 Malotrichus Tilice. 



VICIA SEPIUM L. :— 



a. Galls of Cecidomyia Onobrychidis Bremi (Sc. Nat. ii., 70), 

 composed of a mass of conduplicate fleshly leaflets, the mass being 

 either terminal or axillary. 



b. Galls of Apion Gyllenhallii Schrk., quite similar to those of 

 the same insect on V. Cracca L. (Sc. Nat. iv., 169). They form 

 swellings on the stem, or branches, or petioles, or peduncles just 

 above a node, or above the base of the part affected, if that is a 

 lateral member. The gall becomes about twice as thick as the 

 normal diameter of the part ; but does not otherwise differ much 

 from it in appearance. Its walls are thin, and enclose a space in 

 which the larva lives. The galls are local, but are not rare in one 

 or two places near Aberdeen in August. 



PYRUS AUCUPARIA Gaertrt :— 



a. Blister or pustule-galls in the leaves, the work of a species 

 of mite (Phytoptus), (Sc. Nat, ii., 79) ; very common in many 

 parts of Scotland. 



b. Erineum Sorbi Kunze, also the work of a species of P/iy- 

 toptus, forms irregular patches on the lower surface of the leaf, 

 more or less densely covered with blunt cylindrical or slightly 

 clavate hairs, incurved at the tip, pale yellowish when young, but 

 passing through yellowish-brown to rusty or dark brown when 

 mature. The mites live between the hairs. The patches are 

 usually from 3 to 12 mm. across. Greville records this Erineum 

 from Kinnordy and elsewhere (" Sc. Crypt. Flora" t. 263,/ 1). 

 I have found it on Deeside from Banchory to Ballater, and Dr. 



o 



