2\o TJic Scottish Naturalist. 



White has met with it in Perthshire. Both the Erinenm and the 



blister galls often may be found on the same leaflet, but usually 

 they occur apart. 



PYRUS MALUS L., ACERBA D.C. (Crab-apple):— 



Erineum pyrinum Pers., like the last the work of a species of 

 P/iytoptus, forms irregular patches on both surfaces of the leaves, 

 but most abundantly on the lower surface. Often the patches 

 coalesce so as to extend along the nerves, or even to cover almost 

 the entire surface. They have a velvety aspect, due to consisting 

 of a close growth of short hairs at first pale, but changing to rusty 

 brown. The hairs are from three to five times as long as the leaf 

 is thick, simple, usually rather twisted or hooked near the tip, 

 blunt, and thin walled. Between them live the mites. Dr. 

 White sent me specimens in June, from Dalguise, on the banks of 

 the Tay in Perthshire ; and I also met with it near Kenmore in 

 September. It is recorded by Greville (I.e., I, t. 22, Flora Ediu., 

 p. 449), on P. Mains and on P. communis from Craigie Hill, near 

 Edinburgh. Possibly this gall is the work of the same mite as 

 causes E. Sorbi. 



GALIUM PALUSTRE L :— 



(a) Galls of Cecid. Gallii Winn., consisting of a terminal rosette 

 of leaves (Sc. Nat. I, 156). 



(b) Galls of P/ntop/us, in form of leaves of the upper w r horls 

 being convolute along the margins, or from the tip, so as to form 

 tubes of a yellowish, reddish, or brownish-green colour, inside 

 which the mites live. The appearances presented are very similar 

 though on a smaller scale, to those seen in G. Aparine (Sc. Nat., 

 IV, 15, b), and on G. verum (/.c. p. 204, e) ; and are very pro- 

 bably the work of the same species of mite. 



GALIUM SAXATILE L. :— 



I have already (Sc. Nit. IV., p. 15 and p. 169), described three 

 forms of galls irom this plant, viz. : — 



(a) Phyioptus galls like those described from G. palustre ; 



(b) Flowerbuds, or fruits swollen and tenanted by mites 

 (P/iyfoptus.) 



(c) Flowerbuds swollen and tenanted by larva) of Cecid. Galii 

 Winn. 



To these I have now to add a fourth gall, very common in 

 in Braemar, from about 800 to 3500 feet above the sea level, and 

 also in Perthshire at the same elevation. 



(a) This gall also is the work of a species of PJiytopius, and 



