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The caterpillar is dull green, with a row of triangular - 
shaped reddish spots, edged with white along the back. 
The date of the appearance of the caterpillar is in May. 
It feeds on the white meadow saxifrage (Saxifraga 
granulata ), and the mossy saxifrage (;Saxifraga hyp- 
noides). 
LAEENTIA SALICARIA. 
NORTHERN TWIN-SPOT. 
Plate XXVIII. Figure 10. 
This insect measures a little over an inch to nearly 
one and a quarter in expanse. 
Male: fore wings rather dark brownish-grey, crossed 
by several dark grey lines. The first line is darker and 
waved; second line dark grey, edged indistinctly with 
whitish, central shade dark grey, with a dark blot near 
the upper margin ; third line whitish, central spot black. 
Hind wings brownish-grey within the outer margin. 
Localities for this species are York, Huddersfield, 
Ambleside, Manchester, Arran, Newcastle-on-Tyne, Isle 
of Man, Waterford, Darlington, Ben Nevis, Ben Donish, 
Storeton near Birkenhead. 
The perfect insect appears in June. 
LARENT1A OLIVARIA. 
BEECH-GREEN CARPET. 
Plate XXVIII. Figure 11. 
This insect measures from an inch to an inch and a 
quarter across. 
