Coccidae observed in Durham and N. Yorkshire. 79) 
be extremely harmful to peaches and nectarines under glass 
if once allowed to secure a footing. 
Parlatoria proteus (Curtis). Rare on Cypripediums under 
glass at Birtley. 
Parlatoria proteus var. crotonis (Douglas).—-I once got this 
on Croton but failed to record the locality. In all probabilty 
it was at Birtley. 
Parlatoria pergandit (Comstock).—On imported oranges. 
commonly. 
Parlatoria zizyphi (Lucas).—On oranges, but rare. 
Chionaspis salicis (Linn.)—Our most abundant Coccid, 
occurring everywhere in the Birtley district on Alder (Alnus 
glutinosa), Ash (Fraxinus excelstor) and Sallow (Salix caprea 
et S. cinerea). On ash and Salix aurita near Middlesbrough. 
It is particularly destructive to Salix cinerea on Waldridge Fell, 
and the weakened trees soon fall victims to the Weevil (Cryp- 
torhynchus lapathi Linn.) 
Chionaspis aspidistrae (Signoret).—Once on Ferns at 
Birtley in a hothouse. 
Mytilaspis pomorum (Bouché), the Common Mussel Scale.— 
Not as‘abundant as one would expect. On Salix caprea, S. 
aurita and blackthorn, at Birtley, but on apple at Low Fell. 
Eriopeltis festucae (Fonscolombe).—This has turned up not 
infrequently at Birtley on grasses, not necessarily, but some- 
times, of the genus Festuca. The species is localised in the 
old quarry field in a very small area, well sheltered from north 
and east winds. 
Signoretia luzulae (Dufour).—Near the above, on Luzula 
campestris, but in much smaller numbers and not always to be 
found when looked for. 
Lichtensia viburni (Signoret).—I discovered this for the 
first time at Birtley, on ivy, whilst I was looking for Eviopeltis 
festucae. Only two specimens occurred. 
Pulvinaria vitis (Linn.)—Scarce at Birtley on blackthorn. 
and only on one tree. 
Pulvinaria vitis var. ribesiae (Signoret). Rarely on black- 
currant (Ribes nigrum) in an old garden at Birtley. Now, I 
fear, extinct as the bushes were killed by the Currant Moth 
(Abraxas grossulariata). 
Lecanium hesperidum (Linn.)—On young Abutilons in a 
greenhouse in Middlesborough. Now rare, but I was told that 
it had formerly abounded. 
Lecanium persicae var. coryli (Linn).—Once on hawthorn at 
Birtley. 
Lecanium bituberculatum (Targioni-Tozzetti).—Now gone. 
but formerly quite common on a row of hawthorns in Middles- 
brough. 
Lecanium capreae (Linn.)—This is very common, if some- 
1915 Feb. 1. 
