PIERIS DAPLIDICE. 53 



of a dusky hue, on the upper surface, where they spread 

 out forming a small triangle on the outer margin, as in 

 Aporia cratcegi. The green colour is produced by a 

 sprinkling of black scales on a yellow ground. When 

 therefore the ground-colour is mdre than usually white 

 the veinings become a dusky brown instead of green. 



P. napi varies in distinctness of the green veinings and 

 as much as does the last species in size, as well as in the 

 development of the black markings. Several varieties had 

 once special names, which have now gone out of use. 



P. daplidice, Linn. (Bath White or Chequered White) 

 (Figs. 37 to 41), has obtained its second common name 

 from the markings of the under-surface of the hind-wings, 

 which are delicately chequered with green and white. Un- 

 fortunately this beautiful butterfly is extremely scarce, all 

 the specimens caught in this country having been taken by 

 chance, there being no spot where one might hunt with 

 a reasonable hope of catching them as there is with 

 some of our scarcer butterflies the Lulworth Skipper, for 

 instance. No captures have been made except in the 

 south-eastern and southern counties from the Fens to 

 Devonshire. Nor have the individuals been many, as the 

 following list of captures, recorded in The Entomologist 

 for over twenty years, will shew: 1859, three in Cambs. ; 

 1868, one, near Newmarket; 1871, one, near Abbot's 

 Wood, Sussex; 1872, which was somewhat of a " dapli- 

 dice-yeax" one near Christchurch, one at Portsdown 

 Hill (Hants), one near Faversham, six or more at Dover, 

 five at Deal, one near Folkestone, one at Tilmanstone 

 (Kent), eight near Beachy Head (Sussex), one at Felix- 

 stowe (Suffolk), one at Aldeburgh (Suffolk), two near 

 Newmarket, and one in Surrey; 1876, one at Folke- 

 stone and one near Southend; 1884, two at Dover and 

 one seen near Ashford (Kent); 1885, two at" Folkestone. 



