THE BROWN HAIRSTREAK. 1 39 



each side with white, and there is a white-edged, brownish 

 triangular streak beyond, the outer margin is tinged with 

 reddish ; on the hind wings there are two white irregular lines 

 and the space between them is brownish, the outer margin is 

 reddish, becoming broadly so towards the anal angle, where 

 there is a black spot. Variation is not of a very striking 

 character. The shade following the black bar at end of the 

 discal cell on the fore wings in the male is sometimes yellowish 

 tinged, not infrequently fairly large, and with two smaller spots 

 below it. More rarely all three spots are distinctly ochreous- 

 yellow (var. spinosce, Gerhard). A similar aberration, but with 

 the marks white instead of yellow, has been named pallida, 

 Tutt. The orange band in the female varies in width and in 

 length ; occasionally it extends well below vein 2, and into the 

 discal cell within the black bar. I have one specimen in which 

 the band is broken up into three parts, and the upper one of 

 these is but little wider than the same spot in var. spinosa?, the 

 other two being almost exactly of the same size as in that 

 variety. 



The life-history is figured on Plate 95 — the lower set of 

 figures. 



The egg is described by Newman " as a depressed sphere 

 and white," and he states, "it is attached to the, twigs of black- 

 thorn (Prunus spinosa) in the autumn, often as late as the 

 end of September or beginning of October ; it is not hatched 

 until the spring." 



The caterpillar is bright pale green, and the lines on the back 

 and sides are yellowish, as also are the oblique streaks on the 

 sides and the border of the ridge above the feet. There are 

 some bristles along the ridge on the back and also on that 

 above the feet. It feeds on blackthorn in May and June, and 

 will eat the foliage of almost any kind of plum. I have reared 

 fine specimens from caterpillars which fed on greengage. 



The chrysalis is pale reddish-brown with a dark line down 



