THECLA BETULiE. 185 



cular ridge like the roof of a house, from segment 4 

 forwards the back widens out, the segments deeply cut, 

 the head dark, small, and quite retractile under the 

 second segment ; the skin generally dull, but shining 

 along the middle of the back, thickly covered with very 

 short pubescence ; along the dorsal ridge a double row 

 of longer stiff er bristles, and a single row of them along 

 the subspiracular ridge ; the colour generally a bright 

 light green ; two lines of pale yellow, being in fact two 

 rows of short streaks, commence on segment 2, where 

 they are widest apart, drawing nearer through 3 and 4, 

 and from thence running parallel along the back ; the 

 subspiracular ridge has a yellow line edging it, which 

 goes all round the anal flap, but on 2 stops where it 

 meets the dorsal yellow lines ; on each segment from 

 5 backwards are two rows of small yellow streaks 

 slanting downwards and backwards ; on 4 there is only 

 the upper streak, none on 2 and 3 ; about the middle 

 of the streak in the lower row comes the oval spiracle 

 outlined with brown on a raised round whitish spot ; 

 belly and legs more whitish green ; the hinder pairs of 

 trapezoidal dots can be detected, not easily, being paler 

 than the ground ; the coloration gives the effect of a 

 double dorsal ridge, but this is not so really. I have 

 no account of the pupa. (J. H., 1, 10, 85.) 



Thecla Quercus. 



Plate XIII, fig. 2. 



Ever since I began to collect I have been accustomed 

 to get larvge of this species from oaks in May and June, 

 but never from any other tree, although I have seen 

 the butterflies sporting about and settling upon the 

 ash. In 1877 Mr. Bignell sent me an egg which he 

 had watched the butterfly deposit on a sallow leaf. I 

 suppose the larva is hatched in spring, but am not 

 sure ; it is full fed (according to the character of the 

 season) from the end of May to near the end of June, 



