252 LEPIDOPTERA. 



elongated, anal tuft spreading. Fore wings long, pointed, 

 sub-diaphanous, cell small ; hind wings short, with the hind 

 margin straight ; coll wide ; cross-bar augulated ; legs long 

 and slender. 



We have but one species. 



1. M. unionalis, Huh. — Expanse \\ to \\ inch. All 

 the wings semi-transparent white with a brilliant pearly 

 lustre ; costa of the fore wings edged with orango-brown. 



Antennfe of the male rather long, simple, light brown ; 

 p:dpi short, pale chocolate ; head and thorax shining white ; 

 abdomen pearly white, but the anal tuft in part smoky black. 

 Fore wings long and narrow ; the costa straight to beyond 

 the middle, then strongly arched ; apex angulated ; hind 

 margin oblique and very nearly straight ; colour shining 

 diaphanous white, very pearly, the nervures opacjue ; costa 

 narrowly edged with light orange-brown ; occasionally a 

 black dot is visible at the base of the discal cell, and 

 another at each of its outer corners ; cilia pearly white, 

 Hind wings broad ; angulated at the apex, hind margin but 

 little curved and anal angle prominent ; transparent pearly 

 white with similar cilia. Female hardly differing except that 

 the anal tuft is wholly white ; body a little stouter. 



Undersides of all the wings pearly white with a more 

 opaque white stripe down the costa of each. Body and 

 legs white except that the black tuft is visible in the anal 

 extremity of the male. 



On the wing in June and in September and October, but 

 whether in two generations is doubtful. 



Larva yellow-green with green stripes and a yellow-green 

 head. In autumn on olive. (Milli^re.) 



Pupa apparently undescribed. 



This moth is so rare with us that very little is known of its 

 habits. It has been taken at light at night, and also at 

 flowers. The first known British specimen was obtained at 



