since on Bardolph Fen, in Norfolk. Of late years it has appeared 

 in vast abundance at Whittlesea Mere in Huntingdonshire, and 

 has been found from the 25th of June to the 10th of August ; and 

 the beginning of July the larva, pupa and imago have been all 

 found alive on the same day. This butterfly is very active, and in 

 windy weather conceals itself amongst the highest reeds. It fre- 

 quents, in fine days, the spaces covered with sedges and coarse 

 grass that spring up where reeds have been cut down. 



5. Virgaurese Linn. — Bon. 5. 173^. — Wood, pi. 3./. 60 <? ? . 



18 lines. 3Iale silky, copper-colour, margins of the wings with a narrow 

 edge of black, the inferior having 5 black spots attached, the abdominal 

 margin and cilia blackish : beneath orange-ochre, superior wings with 

 3 longitudinal and 6 transverse black spots; inferior with 2, 3 and 7 black 

 dots, 2 of the last having large and the others small white patches attached 

 to them, at the anal angle is an obscure scarlet spot or two. Female like 

 the male beneath and very similar to the female of L. dit/par above. 



The caterpillar feeds on the Golden-rod (PI. 45) and Ritviex 

 aciitus. The fly is found on the Continent in the spring and middle 

 of summer. It is said to have occurred on the fens of Cambridge- 

 shire, in the Isle of Ely, and near Huntingdon ; and Lewin saw 

 two on marshes in August in the heat of the day, but they were 

 very shy. It seems to have become an extinct species in Britain, 

 although specimens were in all the old Cabinets. 



Gen. 779. Polyommatus Lat. — Curt. Guide. 



Eyes generally pubescent : tarsi not dilated. Larvae like an in- 

 flated shield. 



2. Corydon Fab. — Bon. 7- 236. 1. — Wood,/. 65 S • — Labienus Jerm. var.} 



Male 20 lines, silvery pale blue, costa and posterior margin with their 

 nervures black, inferior wings with the edges and a row of spots black, 

 cilia white, spotted with black : underside of superior wings whitish with 

 1 1 black spots on the disc and two rows of fuscous ones towards the pos- 

 terior margin ; inferior wings cinereous, bluish at the base, with a sub- 

 pyriform white spot on the disc, surrounded by 12 black spots occllated 

 with white, two of the posterior ones with the ocelli united and forming 

 an oblong white space, 7 or 8 black dots near the posterior margin with 

 a scarlet spot and black A above them. Female 18 lines, violaceous 

 brown, with an ocellated dot on the disc, a hne of pale but indistinct 

 ocelli near the posterior margin ; inferior wings with 6 or 7 black spots 

 on the margin with scarlet crescents above them, cilia ochreous with large 

 brown spots : beneath ochreous-brown, spotted like the male, but the spots 

 in the superior wings are darker and ocellated and the marginal ones a 

 little scarlet above. A very variable insect : sometimes the disc of the 

 wings is silvery blue in the females. 



This handsome insect appears from the beginning of July to the 

 middle of August in chalky districts, especially at the tops of the 

 cliffs about Dover, at Darent, in Huntingdon, Suffolk, and Cam- 

 bridgeshire, the Isle of Wight, Dorset, Sussex, Wilts, and Oxford. 

 P. Lahieims was taken in a meadow at Wrabness, Essex, the be- 

 ginning of August. 



The caterpillar feeds on the Wild-thyme. 



5 



