RECORD OF SOME NEW BRITISH PLANT-GALLS. 51 
Records of some new British Plant-galls. 1. Diptera (Cecidomyide). 
By RICHARD S. BAGNALL, F.L.S., F.E.S., and J. W. H. HARRISON, B.Sc., 
F.E.S. 
During 1915 we spent a good deal of our spare time in working 
_ out the plant-galls of Northumberland and Durham, and are publish- 
ing accounts of the Cecidomyidae and Hriophyidae in due course. It 
is desirable that galls caused by insects and mites previously unknown 
as British should be put on record at once, hence the reason for these 
brief notes. 
See also HE. W. Swanton, Jr. of Bot., 1916, pp. 24-29; and H. J. 
Burkill, Ent., 1916, pp. 4-8. 
CECIDOMYIDA. 
Rhabdophaga pierrei, Kieffer. 
Duruam, Birtley, rare on twigs of Salix repens (J.W.H.H.). 
Perrisia fructuum, (Rubs.). 
In seed-pods of mouse-eared chickweed (Cerastium vulgatum). 
Yorxsuire, Marton (J.W.H.H.): Duruam, near Fatfield (R.8.B.). 
Perrisia geranit, Can. 
NorraumBertand, Budle Bay, exceptionally common, and Durzam, 
Cowpen Bewlay, one example only (J.W.H.H.). 
Perrisia salicariae, Kieffer. 
NortHUMBERLAND, not uncommon on purple loosestrife (Lythrum 
salicaria), near Bamburgh (J.W.H.H.). 
Perrisia scabiosae, Kieffer. 
Duruam, common on small scabious, Penshaw Hill (BR.8.B.). 
Perrisia schlechtendali, Kieffer. 
Duruam, sparingly on Lathyrus macrorhizus, Birtley (J.W.H.H.). 
Perrisia sp. (probably viryae-aureae (Leib.). 
Duruam, in heads of golden-rod (Solidago), Gibside (R.S.B.). 
Janetiella thymicola, Kieffer. 
NorTHUMBERLAND, Seahouses (J.W.H.H.), and Crag Lough (R.8.B.). 
Stictodiplosis hypochaeridis, (Rubs.). 
NorTHUMBERLAND, in quantities on Hypochaeris, near Haydon 
Bridge (R.8.B.); Yorksuire, sparingly, Cleveland district (J.W.H.H.). 
Contarinia tragopogonis, Kieffer. 
Duruam, on the Wear at North and South Hylton, Washington 
and Penshaw on goatsbeard, Tragopogon pratensis (R.S.B.). 
Cystiphora pilosellae, Kieffer. 
On mouse-ear hawkweed (Hieracium pilosella). Duruam, Birtley 
Fel! (J.W.H.H.), and near Penshaw, once only (R.§8.B.). 
Cystiphora tarawaci, Kieffer. 
NorTHUMBERLAND, on leaves of dandelion, on the coast near Bam- 
burgh (J.W.H.H.). 
? Cystiphora leontodontis, Kieffer. 
Duruam, on leaves of Leuntodon hispidum, Washington and Pen- 
Shaw (R.§.B.). 
