JULY 203 



with a small transverse white line near the hinder margin 

 of the primary wings, and another towards the middle of 

 the secondary pair, forming two acute angles resembling 

 the letter W ; behind this is a band of orange-red ; the 

 margin and the projecting tailed point are black, some- 

 times tipped with white. The caterpillar is green, with 

 three red spots on each side of the lower segments, and a 

 double series of small dots on the back ; it feeds on the 

 elm and blackthorn. The perfect insect is in general rare, 

 but in some seasons is found in great profusion. 



THECLA PRUNI. Black Hair-streak. This species has 

 often been confounded with the former, which is more 

 common ; the difference on the upper surface seems to 

 consist in the addition of three or four crescent-shaped red 

 marks near the hinder margin ; the colour of the under 

 side is yellowish-brown, marked with an irregular silvery 

 line near the hinder margin of the primary wings, and 

 across the middle of the secondary pair ; behind this is a 

 row of black spots, and on the margin a series of black 

 crescents ; the upper wings have the spots red. The 

 caterpillar is green, with longitudinal whitish rays, and 

 numerous short transverse lines ; the head is small and 

 yellow. 



