BILBERRY PUG. 253 



a more or less distinct reddish or dark-green line along the 

 back, and reddish ring-divisions. It feeds in flowers of the 

 wild apple or crab, and of apples and pears grown in orchards 

 and gardens. It is found in April and May, and the moth is 

 out in June and July. 



The species is common throughout the greater part of 

 England and Wales, and its range extends to Ross in Scotland. 

 It has a wide distribution in Ireland. 



Bilberry Pug {Chloroclystis debiliata). 



As a British insect, this species (Plate loo. Figs. 7 and 8) was 

 first found in Devonshire, and was then known by the English 

 name of " The Devon Pug." As the yellowish green caterpillar, 

 marked with a darker hne along the back and a yellowish one 

 low down on the sides, feeds on bilberry, in April and May, 

 and is by no means confined to Devonshire, the popular name 

 here adopted is more suitable. 



When quite fresh the moth, which is out in June and July, 

 has a very delicate tinge of green, but this quickly fades out, 

 leaving a pale greyish white insect. In the typical form 

 (Fig. 7) the black central lines are fairly well defined, but in 

 ab. nigi'opiinctata, Chant (Fig. 8), the lines are represented by 

 a series of dots. 



The species is common in some of the sheltered hollows 

 among the hills in Devon and Somerset, and I used to find it 

 in abundance in the Martinhoe district, in the former county. 

 The moths were rarely disturbed from the food plant during 

 the day, but towards dusk they flew in numbers around small 

 trees of mountain ash. Other counties in which it is known to 

 occur are — England' : Cornwall, Worcester, Staffordshire, 

 Leicester, and Lancashire (formerly on Chat Moss). Wales : 

 Glamorgan and Pembroke. Scotland : Aberdeen. Ireland : 

 Wicklow, Waterford, Cork, Kerry, and Sligo, 



