lO CATALOGUE 01* BUTTEEFLIES. 



Buckler reared all three forms of the insect, thus establishing 

 their identity beyond all doubt and satisfactorily confirming Mr. 

 Wailes' views. Special interest therefore attaches to the species 

 in these counties. 



' Salmacis is commonly known as the '' Durham Argus," and 

 no doubt many believe all our specimens are of this form. This, 

 however, is not so. While the Scotch "White-Spot {Artaxerxes) 

 is the only form found in Scotland, and the type, with a distinct 

 border of orange spots round the margin of both wings, is the 

 only form found in the south of England, both these forms may 

 be found here along with that which Stephens called Salmacis, 

 and other curious and interesting departures from the type. 

 Though description does not properly belong to a Catalogue, it 

 may be worth while to differentiate these forms here. 



Agestis has a row of orange spots round the hind margin of 

 the wings and a black spot in the centre of the fore-wing ; the 

 underside has white spots with black centres. 



Artaxerxes differs in having a white spot on the centre of the 

 fore-wing, instead of a black one, and in the white spots of the 

 underside being without the black centres. 



Salmacis is without the orange spots in the male, and in the 

 female they are smaller and often not extending along the whole 

 of the margin. The white spots on the underside are sometimes 

 without the black centres. 



Among the other interesting varieties that have been found 

 in these counties is one in which the hind wings have a white 

 spot in the centre as well as the fore-wings. Sometimes only a 

 single scale will be white, and sometimes they form a ring round 

 a black centre. I have also found two at Black-Hall Rocks, in 

 which the underside had black spots surrounded by rings only 

 slightly paler than the ground colour, and showing no white at 

 all. Others are found in which these spots are almost entirely 

 eliminated. 



"While the Salmacis form has been named after one of our 

 counties, the insect is by no means generally distributed with 

 us. It occurs at Black-Hall Bocks, near Hartlepool, and along 

 the coast to Castle Eden Dene. I have found it very little fur- 



