176 BL \CK AND •R'HITE HORNED CLEAR-WING. 
basal segment. The ^^•ings are transparent; the 
upper pair with the nenrures, the margin, the apex, 
and a broad trans^'erse stripe not far from it, blue- 
black ; the posterior pair having the hinder edge, 
the nervures, and a cross mark near the middle of 
the anterior edge, likewise blue-black. The fringe 
of the wings is bro>vnish-ash. The thighs and 
tibiiB are blue-black, the former yellow externally 
in the fore-pair; the tarsi yellow, sprinkled with 
black ; antennm yellowish-white at the apex. 
Still rarer than the preceding, both in this coimtry 
and on the continent. The few British examples 
preserved in cabinets have been found chiefly in the 
neighbom-hood of London and in the Isle of Wight. 
It frequents birch-trees, on the wood of which the 
larvas probably feed. 
