P rEROPHORID.-}-:-PLA T 1 'P TIL US. 347 



ochreous bar; also from the base a brownish-oclireous 

 horizontal line extends one-fourth the length of the middle 

 of the wing, but after a pale interval is continued as a 

 broader similar cloud to below the pale bar and usually 

 united to the costal cloud ; the costa before the apex is 

 narrowly brown, and often the apex itself and a line or cioud 

 down the hind margin, the latter also shaded inward ; the 

 whole surface thus being broken up into paler and darker 

 ochreous shades; cilia white or yellowish-white. Hind 

 wings cleft to tlie base into three broad fully ciliated fingers 

 or sections ; pale golden-brown, including the cilia. Legs 

 very long, whitish-ochreous, regularly clouded from each 

 joint with ochreous or yellow-brown. Female similar, the 

 body a little thicker behind. 



Underside of the fore wings smoky-red-brown to the 

 middle, ochreous beyond, the margins faintly spotted with 

 white. Hind wings pale golden-brown. Body pale- 

 brown. 



Variable in the shade of ground-colour from ochreous- 

 white to rather rich full ochreous, and in the deeper shades 

 of clouding. In that along the costa is often a deeper brown 

 costal streak above the fissure ; and concealed in the brown- 

 ochreous cloud, a darker spot lies at the fissure's base — 

 though this last is more obvious in worn specimens. The 

 legs also vary greatly in the degree of dark clouding at the 

 joints^ This last character has been relied upon as a means 

 of dividing this species into two, called respectively P. 

 dichrodachjlus (the darker), and P. lertrami (the; paler form;, 

 but although the former seems to be more restricted to 

 tansy, as a food plant, and the latter to yarrow and 

 sneezewort, I am unable to find any reliable distinguishing 

 character between them. On the other hand I find every 

 possible intermediate shade of variation, the darker being 

 apparently the more northern forms. 



On the wing from the end of June till August. 



