Falconer'. Plant Gall Foray at Leeds. 



271 



Birch. 



AC. Eriophyes rudis Can. ' Big bud,' King Wood, Adel Moor and 

 Roundhay Park. In the latter place, the axis of the buds 

 was lengthened and the scales in consequence separated and 

 lossened, giving the galls a ver^.' unusual appearance, due, most 

 probably, to the swarms of mites present producing greater 

 excitation and growth. 

 DIP. Contarinia betulicola Kieff. Adel Moor. 



Massalongia rubra Kieff. Adel Moor. Just beginning. 

 Oligotrophus bciulae Winn. King Wood. 



Alder. 



AC, Eriophyes brevi tarsus Fckn. Waterloo Lake and the Gorge, 

 Roundhay Park. 

 E. nalepai Fckn. Waterloo Lake and the Gorge, Roundhay 



Park. 

 E. laevis Nal. The Gorge and Adel Moor. 

 FUN. Exoascus alnitorquus Winter. ' Leaf blister,' the Gorge. 

 Frankiella alni R. Maire. The Gorge, affecting the roots. 



Hazel. 

 AC. Eriophyes avellanae Nal. ' Big bud,' Roundhay Park. 



Wych Elm. 



HOM. Schizoneura ulmi Linn. Roundhay Park. Queen and young 

 present. 



.Creeping Buttercup. 



HEM. Aphrophora spumaria Linn. Roundhay Park (see p. 269). 



and Adel ; apterous 



Blackthorn. 



HOM. Aphis padi Linn. Roundhay Park 

 females. 



Mountain Ash. 



AC. Eriophyes pyri Pgnst. Adel Bog. 

 HOM. Aphis sorbi Kalt. The Gorge, Roundhay Park. 



Dog's Mercury. 



HOM. Aphid (?) spec. Torsion of midrib of leaf in some cases; 

 margin at one pointed abruptly twisted and a portion of the 

 blade turned loosely upwards, sometimes exposing the lower 

 surface ; upper surface slightly puffed. 



Sycamore. 

 AC. Eriophyes macrochelus Nal. Roundhay Park. 



Sycamore and Maple. 



AC. Phyllocoptes gymnaspis Nal. Roundhay Park ; in both cases 

 the gall mites observed. 



Ash. 



AC. Phyllocoptes epiphyllus Nal. Roundhay Park and Adel ; the 

 mites noted. I have seen it also in many places about 

 Huddersfield, and in N. Wales. 

 HOM. Psyllopsis fraxini Linn. Roundhay Park and Adel, just 

 beginning, but every indication that it would be as abundant 

 in these places as it is elsewhere. 



1921 Aug. 1 



