28 LEPIDOPTERA. 



yellowish hind wings ; Mr. W. H. B. Fletcher another 

 with the fore wings entirely deep red-brown, except a very 

 narrow pale stripe ; and I reared one in Pembrokeshire 

 of which the outer halves of the fore wings are of the paler 

 colour of the female. In the collection of the late Mr, F. 

 Bond are two gynandrous examples, one being exactly 

 divided, the left side male, but the other having male 

 antennae and large elongated blotches of the female colouring 

 on the wings. Perhaps the most extraordinary variation yet 

 noticed is one of a very dark red-brown which has the pale 

 stripes olive-green, and rays of the same colour running 

 toward the hind margin. Two such males and a female have 

 been obtained in the West Riding of Yorkshire, and one is 

 in the cabinet of Mr. G. T. Porritt. Very possibly the figure 

 of Lasiocampa dumcti in Westwood and Humphrey's work 

 may have been drawn from a specimen such as these. Even 

 the central white spot varies in shape, from nearly round to 

 diamond- shaped or irregularly angulated. In one male 

 specimen, taken in Pembrokeshire, it is elongated and 

 divided. Some indication of possible cause of variation of 

 colour in this species has been furnished by Mr. F. Merri- 

 field, who has brought out males of a rich red colour from 

 pupee of the northern dark chocolate race by keeping them 

 at a temperature of 80 degrees F. Those of the southern 

 race, kept under similar conditions, were of an unusually 

 light colour ; while those kept at 46 degrees F. were much 

 darker. That the dark northern colouring is not wholly 

 produced by length of time in the pupa state is proved by 

 the rearing of dark specimens in the same summer as that m 

 which the larvas fed up ; or, on the other hand, by the 

 emergence of typical light forms from pupge which have lain 

 through the winter. 



On the wing in July and August ; occasionally at the end 

 of June. 



Lakva large, cylindrical, elongated, hairy ; head rounded, 



