THE BRIMSTONE. 283 



on the last ring. It feeds on oak, birch, and sallow, from July 

 to September. 



The moth, which inhabits woods, and is out in late May and 

 in June, is sometimes attracted to sugar, but rather more 

 frequently to light. It is, however, far more rarely seen than 

 the caterpillar, which has been obtained in almost every English 

 county up to Yorkshire. The moth has been recorded from 

 Darlington, Durham, Northumberland, and Cumberland. It 

 occurs in Wales and Ireland, and several larvae were beaten 

 from a beech hedge in Perthshire. 



The range abroad extends to Amurland and Japan. 



The Brimstone {Opisthograptis lutcolatii). 



This generally distributed and often common yellow species 

 (Plate 117, Figs. 4 and 5) has the front margin of the fore wings 

 marked v/ith reddish, and occasionally a stripe of this colour 

 extends along the front margin from the base to the tip ; the 

 discal mark is whitish outlined in reddish brown ; the wavy 

 cross lines are often faint, and not infrequently quite absent. 

 White specimens, ab. lacticolor^ Harrison, have been recorded 

 from Cheshire and Durham, and probably have occurred else- 

 where, since I have a specimen said to have been taken in 

 Staffordshire ; an orange-yellow form has occurred in the last- 

 named county. (Also known as I\n?ma cratcegata.) 



The twig-like caterpillar is brownish tinged with greenish or 

 purplish ; there is a double-pointed hump on the back of ring 6 

 and smaller projections on 8. It feeds on hawthorn chiefly, 

 but sometimes on sloe, plum, etc. It may be found after 

 hibernation in the spring, and a second generation occurs in 

 \he summer. 



The moth seems to have been noted in each month from 

 April to August, but it is most frequent in May and June. 



