362 ARACHNOIDEA, 



CASE Many other Phytopti, which are as yet desiderata in the collec- 

 tion, have been described as occurring on the Continent, most of 

 which are no doubt also found in Britain. We may note one or 

 two of the more important of these. 



On the Apple Tree. 



ERINEUM MALI, Am. 



This causes hairy spots on apple leaves, described as a crypto- 

 gamic growth by the earlier botanists. In these, where the hairs 

 spring, the larvae of the mites are distinctly to be seen. 



TyPHLODROMUS MALI, Am. 



Dr. Amerling found this on the young leaves of the apple tree, 

 in the orchards at Prague. May it not be same as T. pyri ? 



On the Pear Tree. 



VOLVELLINA MARGINALIS, Am. 



Of this Amerling says, the larvae move about the edge of pear 

 leaves that are just opening from the buds. 

 Phytoptus Sp. 



A flat pustule, like galls in the parenchyma of the leaf, such as 

 those on the leaves of Sorbus torminaHs. 

 Phytoptus Sp. 



The edges of the leaves rolled up sometimes all round the leaf. 

 This rolling has more than one round, is very thick and firmly 

 rolled ; the inside quite smooth and shining, the outside somewhat 

 lighter coloured than the leaf, and are for the greater part found 

 on the first leaf in the shoot. It harbours the Phytoptus in small 

 numbers ; it is white at first, and then becomes red. 



On Cydonia Vulgaris. 



Erineum aucupari^, Ktmze. 



Flat pustules, like galls in the parenchyma of the leaves, which 



are often like those on the leaves of Pyrus and Sorbus. The 



entrance to this gall is, as usual, on the under side of the leaf; 



