THE SINGLE DOTTED WAVE. 121 



Small Fan-footed Wave {Acidalia {Ptychopoda) hisetata). 



One form (Plate 46, Fig. 10) has whitish wings, with a deep, 

 dark-grey border on the outer area of all the wings ; this border 

 is traversed by a whitish, "wavy line (ab. fijnbriolata^ Stephens). 

 Another form (Plate 46, Fig. 7) is more or less typical, and in 

 this it will be noted that the marginal borders are much paler, 

 and are broken up into bandlets. Between these two forms 

 there are modifications, and sometimes a greyish shade spreads 

 over all the wings. 



The caterpillar is long and slender, with a somewhat flattened 

 appearance, and gradually tapered towards the notched head ; 

 the general colour of the roughened body is greyish brown, the 

 middle ring divisions, and V-shaped marks on the back, are 

 blackish or dark brown ; there is also a double dark-brown 

 line along the back, not always distinct. It feeds, from August 

 to May, on a variety of low-growing plants, and is partial to 

 withered leaves, especially those of bramble and dandelion. 

 The moth is out in June and July, and is often common, and 

 pretty generally distributed throughout our islands, except that 

 it seems not to have been noted north of Moray, in Scotland. 



Abroad, the range extends to East Siberia and Amurland. 



The Single Dotted Wave {Acidalia {Ptychopoda) 



dimidiatd). 



The most noticeable feature in this whity brown moth 

 (Plate 47, Figs. 9 and 12), sometimes known as scutulata^ 

 are the larger dots at the costal end of the dotted cross lines, 

 and the blackish or dark-brown chain-like mark on the lower 

 part of the outer marginal area of the fore wings ; the latter is 

 sometimes obscured in a cloud of its own colour. 



