Erebia palarica and Erebia stygne. 21 



same grass, and at La Granja, gradually starved themselves, 

 and died. I got none home alive This clearly indicates a 

 different taste in food-plant, as Mr. Powell also points out, 

 though he was handicapped by a Riviera summer, practi- 

 cally making grass unobtainable. 



Small stygne eggs laid July 14th and 15th, are pearly 

 white when newly laid, but soon become slightly brownish. 

 This is due to a general change of colour, but chiefly to a 

 development of brown patches, each consisting of an 

 agglomeration of dark dots. These vary very much in their 

 disposition. In one or two cases the dots are nearly 

 uniformly distributed (not in patches). The patches may 

 be four or five in the length or width of the egg, with 

 small spaces between, or they may be much smaller, so that 

 there are eight or ten to the length of the egg. On some 

 the dots are distinctly in regular rows in each patch. 



They vary a little in size and shape, about 1*3 mm. high, 

 and 08 wide, a little narrower at the top, but maintaining 

 width to close to each end. There are 22 ribs, varying 

 from 20 (one counted) to 24 or perhaps 25. The ribs are 

 high but not sharp, and may be a little waved. They 

 never branch or anastomose, but end at top by merging in 

 an area that looks beaded (high power not available). 

 The secondary ribs are poorly marked but very distinct 

 when a suitable light falls on them. 



Large stygne {palarica) eggs laid July 16th and 17th, 

 same as small. They are perhaps those of one £ only, but 

 they are very uniform in size of red-brown patches, viz., 

 about 5 or 6 across egg and ribs seem most usually 24, 

 but one is found with 21. 



In the individual variations of the eggs it is difficult to 

 be sure of size, but that of palarica seems to be fraction- 

 ally less than of stygne — 1*2 instead of 1*3 mm. Each $ 

 seems to lay eggs of a similar facies, with the later 

 smaller and even stunted and deformed. Later layings by 

 other $$ of palarica showed the range of variation in the 

 egg markings to be practically the same in both species. 



The eggs of both hatched between July 31st and 

 August 2nd. The young larvae are very nearly identical. 

 The large palarica seem the paler in having the dorsal 

 band slightly narrower and the lateral line is lighter in 

 colour. It might be called white in the larger (jpedmiea), 

 yellow in the small {stygne), but this would exaggerate 

 the difference, 



