33^ Bagnall and Harrison : Midge-Galls of Yorkshire. 



Moyetiola ventricola Riibs. On Molinia caeriilea. On all the Cleveland 



Moors. 

 Chortornyia hellwigi Riibs. Galling stems of Brachypodixim sylvaticum. 



Leeds district. 

 Cystiphora pilosellae Kieff. On leaves of Hieracium Pilosella. Rare ; 



Redcar. 

 C. taraxaci Kieff. On leaves of dandelion. Very local ; Redcar. 

 Macrolabis corrugans F. Loew. Distorts leaves of Heracleinii Sphondylium. 



Common and widespread . 

 M . lamii Riibs. Similar to the preceding, but on Lamium album ; here 



first definitely recorded from the British Isles. Gunnergate. 

 M. liiceti K. First British record. Sparingly on Rosa glauca forms in 



the North Cleveland area. 

 M . pilosellae Binnie. On Hieracium Pilosella. Redcar. 

 Arnoldia sp. In the mass of young leaves near the growing point of oak 



shoots ; prefers young trees. Common everywhere. 

 Rhabdophaga albipennis H. Loew. Galls bark of Salices, preferring those 



of the S. alba group ; gall very inconspicuous. Very common 



everywhere . 

 R. marginemtorquens Winn. Folds margin of leaves of Salices chiefly 



5. alba group. Abundant everywhere. 

 7?. nervorum Kieff. Galls nerves of various Salices. Abundant on 



5. vitellina, Nunthorpe. 

 R. rosaria H. Loew. Forming a persistent rosette of leaves on various 



sallows and willows. Generall}' plentiful. 

 R. rosariella Kieff. On Salices of the Caprea group ; similar to the last 



named species, but smaller. Great Ayton. 

 R. saliciperda Dufour. On various Salices. Eston. 

 R. terminalis H. Loew. Likewise on Salices. Everj'where abundant, 



even in Middlesbrough. 

 Perrisia abietiperda Hens. On Picea excelsa. In Marton Gill. 

 P. acrophila Winn. On Fraxinns excelsior. Thinl)', but well dis- 

 tributed. 

 P. affinis Kieff. On Viola spp. Stainton, Yarm, Ayton, etc. 

 P. angelicae Riibs. Swollen florets of Angelica sylvestris. Yexx abundant 



in Durham and probably elsewhere ; here first recorded from 



Britain. Yorkshire ; quite common. Great Ayton. 

 P. aucupariae Kieff. Twists leaves of Pyrus Aucuparia. Lonsdale, 



Kildale. 

 P. auritae Riibs. Folds leaves of Salix aurita and 5. cinerea like R. 



ynarginemtorquens ; here first recorded from the British Isles. On 



Salix aurita, Lonsdale. 

 P. brunellae Kieff. On Prunella vulgaris. Stainton ; rare. 

 P. cirsii Riibs. In heads of common thistle. Widespread and common. 

 P. compositarum -Kieff. On heads of Cirsium lanceolatum. Marton, 



Bardsey, near Leeds. 

 Perrisia sp. On C. lanceolatum ; larva^ whitish. Not uncommon. 

 P. corylina KiefE. In hazel catkins. Guisborough Park Wood. 

 P. crataegi Winn. Terminal rosette of leaves on Crataegus oxyacantha. 



Everj'where excessively common. 

 P. daphnes Kieff. On Daphne Laureola. Gunnergate. 

 P. engstfeldi Riibs. On Spiraea Ulmaria. Marton, Ayton. 

 P. ericina F. Loew. On Erica cinerea ; Great Ayton Moor. 

 P. filicina Kieflf. On Pteris aquilina. Not very common, but still 



well distributed. 

 P. fraxinea Kieff. On leaves of ash. Not uncommon in the Cleveland 



area. 

 P. fraxini Kieff. With the preceding species. 

 P. fructuum Riibs. In seed pods t)f the members of the genus Cerastium. 



Plentiful everywhere in the Cleveland District. 



Naturalist 



