96 THE entomologist's becord. 



Records of some New British Plant=Galls. VI. Ninety=nine New 

 British Gall=niites (Eriophyidae). 



By EICHAED S. BAGNALL, F.L.S., F.E.S., and J. W. H. HAKRISON, M.Sc. 

 (Continued from iJage 15.) 



The Kriophiiidae, or gall-mites, are mostly gall-causers or inquilines 

 of mite-galls. The creatures themselves are very small, some being so 

 minute as to take more than one million (1,000,000) to cover a piece of 

 paper two inches square. It is one of many groups that may be classed 

 as "neglected" by British naturalists, though many mite-galls are 

 well enough known. At the beginning of 1916 fewer than 70 forms 

 of Eriophyidae were known (so far as we can gather) to British 

 naturalists, and these were known almost entirely by their galls. 

 Without pretending in any way to have made a special study of the 

 subject we have records of 174 British species and varieties, 85 of 

 which are as yet unnamed, and 150 of which are dwellers in our 

 northern counties. Our list of mite-galls caused by the 174 forms 

 numbers 230. 



To any naturalist wishing to study the mites themselves it w'ill be 

 recognised that there is a rich field for research. 



Family. ERIOPHYID^. 

 Subfamily. Eriophyin^. 



1. Eriophyes pteridis, Moll. 



On bracken. Houard, 66. 



Records from Northumberland, Durham, Cumberland, Lancashire, 

 and Cheshire. 



2. E. pint var. ftoricola, Nal. 



On silver fir. Houard, 112. 



Durham, Eastgate in Weardale, E.S.B. 



3. Eriophyes qiiadrisetiis, Thomas, and 



4. E. quadrisetus w-AV. juniperina, l^a\. 



On juniper. Houard, 123, 124. 



Lancashire and Westmorland, in the neighbourhood of Grange - 

 over-Sands, R.S.B. 



5. Eriophyes tenuis, Nal. Houard, 288, 257. 

 Durham, Penshaw district, on Bromns sterilis, R.S.B., and Wolvis- 

 ton, on Dactylis glomerata, J.W.H.H. 



6. Eriophyes popiili, Nal. 



On white poplar. Houard, 472. 

 Lancashire, Ainsdale and Freshfield, R.S.B. 



7. Eriophyes varius, Nal. 



On aspen. Houard, 515. 



Records from Northumberland, Durham, and Yorkshire. 



8. Eriophyes triradiatus, Nal. 



On SaliiV repens, rosette of leaves. Houard, S. 13. 

 Lancashire, near Ainsdale, R.S.B. 



