THE CLIEDEN NONPAREIL. 
243 
sides, attenuated before and behind, and fumisbed 
with a caudal prominence. These insects may be 
distinguished as a genus by the length of the trunk, 
which is equal to that of the antennm ; by the palpi, 
which hare the middle joint nearly one half longer 
than the two others, and so densely clothed rrith 
scales as to appear double the thickness of the 
terminal one, the latter being short and slender ; 
by the abdomen being attenuated posteriorly, and 
the fringe of the wings, especially in the hinder 
pair, being long and rather deeply indented : the 
thorax slightly crested, large, and strong ; the head 
small, and the antennee long and setaceous, covered 
■with scales external^, and short hairs on the inner 
side. 
The species named C. Fraxini is the largest 
moth found in this countiy, the expansion of the 
wings sometimes reaching four inches. The thorax 
and upiper ■wings are light grey on the surface, the 
latter variegated with transverse undulating lines of 
browi. The under wings are bro^vnish-black, with 
a broad curved band of light blue across the middle. 
The fringe of all the wings is pure white, deeply 
indented, and preceded by a row of dusky triangular 
marks, having the point tmmed outwards, which is 
most distinct in the hinder ■brings. Tlie under side 
of the body and legs are white, the tarsi of the 
anterior pair spotted with brown above. 
The caterpillar lives on the ash, poplar, oak, elm, 
birch, &c. It is ash-coloured, more or less yellow- 
ish, and sprinkled with minute black dots. The 
