BOARMID^—PACHYCNEMIA. 251 



1. P. hippocastanaria, Hub. — Expanse 1^ to 1^ inch. 

 Fore wings long ovate, slate-grey, with the nervures darker, 

 and the two transverse lines greyish-white ; hind wings large, 

 greyish-white. 



Antennae of the male simple, rather thick, minutely ciliated, 

 dark brown ; palpi pointed, slender, but slightly projecting, 

 dark grey ; tongue very small ; head and thorax slate-grey 

 abdomen slender, smooth, pale yellow-brown ; lateral tufts 

 minute ; anal tuft pointed. Fore wings elongated, narrowly 

 ovate; costa much arched; apex bluntly rounded, almost 

 angulated ; hind margin short, curved and oblique; dorsal 

 margin rather rounded, slightly ciliated ; colour dark slate- 

 grey, the nervures obscurely blacker, and the surface dusted 

 with minute white scales ; first line sharpl}^ angulated out- 

 wards, blacker grey, more blackened on the nervures, but 

 edged inwardly with cloudy white ; second line white, rather 

 oblique, but curving up from the middle, disposed through- 

 out in short curves, along with which are minute dark streaks 

 on the nervures ; discal spot black ; close to it is a faint 

 cloudy-black central shade ; hind margin dotted with black ; 

 cilia silvery-grey. Hind wings large and rather long, rounded 

 behind ; thin and silky ; dusky white faintly shaded with 

 grey along the hind margin ; central spot minute, black. 

 Female accurately similar, with body only a very little 

 stouter. 



Underside of the fore wings glossy brownish-grey ; discal 

 spot just perceptible ; as is a faintly darker indication of the 

 second line. Hind wings shining, dusky white, shot with 

 very pale brown. Body pale grey ; legs grey. 



Extremely constant in colour and faint markings. 



On the wing in April and May, and as a partial second 

 generation in August. In an unusually forward season it 

 has been taken in March. 



Larva. Head semi-prone, wider than the second segment, 

 and not notched on the crown ; second segment dilated in 



