2o6 LEPIDOPTERA. 



stigma hardly perceptible, only indicated by a partial pale 

 brown ring edged at one side with black ; reniform stigma 

 also obscure, pale brown, broken up with dark brown and 

 placed in a smoky cloud ; at the outer corner of its base are 

 placed the two white dots, arranged like a colon, from which 

 the species takes its name ; clavif orm stigma hardly indi- 

 cated ; costa spotted with yellowish-brown, hind margin with 

 -minute black lunules ; cilia dark brown, divided by yellowish 

 dashes. Hind wings brownish white ; nervures brown ; 

 hinder portion of the wing occupied by an ill-defined, broad, 

 smoky-brown band lying along the hind margin ; cilia white. 

 Female rather stouter, but otherwise accurately similar. 



Underside of the fore wings white at the base, shading off 

 to smoky brown toward the hind margin ; nervures darker 

 brown ; a black spot in the reniform stigma ; middle area of 

 the wino- downy with long scales. Hind wings white, broadly 

 dusted with brown on the costal region and hind margin \ 

 nervures brownish ; central spot a dark brown crescent with 

 long points. Body and legs dusky brown. 



This insect so nearly resembles two or three allied species 

 that it is desirable to call attention to the characters by 

 which it may always be distinguished — the white colon, and 

 the dotted yellow subterminal line. 



Usually very little variable except in the degree of 

 umbreous rippling and dusting ; occasionally this is so in- 

 creased as to obliterate all the pale ground colour. There 

 seems to be a slight local variation on the North-east coast, 

 specimens from Durham being sometimes more prettily 

 mottled, with the transverse lines usually more distinct. 

 In Mr. S. J. Capper's collection is a specimen in which 

 the yellow dots of the subterminal line run inwards in 

 yellow dashes. Mr. P. M. Bright has examples from the 

 east coast of Scotland which are nearly black. 



On the wing at the end of May and in June, and as a 

 partial second generation, at the end of July and in August. 



Larva cylindrical, plump, but with the anal segment 



