BEE CLEAR- WING. 173 



the others edged with black, the fifth and the poste- 

 rior two brown on the back and having a line of 

 the same colour on the sides. All the wings are 

 transparent, with the edges, the nervures, and a 

 transverse stripe on the primary pair rust-brown; 

 the fringe tawny -brown. The thighs are yellow on 

 the outer side and dusky internally, the rest of the 

 leg yellow. 



The caterpillar is pubescent and whitish, having 

 a dusky line along the back and a dark-brown head. 

 It lives in the stem and roots of willow and poplar 

 trees. Its perfect insect likewise frequents these 

 trees, and is riot scarce in certain situations ; such 

 as Epping Forest, Coombe Wood, &c. It is usually 

 found in June and July. Only one other species 

 besides the above seems to inhabit Britain, viz. 

 T. crabroniforme, Hornet Clear-wing, which has 

 the head and thorax brown, the latter with a rust- 

 brown spot on each side behind, and the abdomen 

 cinctured with two black bands. 



