648 EXTERNAL ANATOMY OF INSECTS. 
layer as before mentioned, the upper one consists of 
dense hairs, except at the apex, and the lower one of 
- scales; and in most of them the scales of the primary wings 
are piliform, and the secondary are covered by what ap- 
proach very near to real hairs; many of the Aftact are 
similarly circumstanced: the four wings of A. Cytherea 
are also covered externally with hair. 
7. Before I conclude this long diatribe on the organs 
of flight of insects, I must not omit some notice of the 
infinite diversity of colours with which their wings are 
often variegated and adorned by the CreaTor, who 
loves to delight us by the beauty, as well as to astonish 
and awe us by the immensity and grandeur of his works. 
Though the wings in every Order exhibit instances of 
brilliant and beautiful colouring, yet those of the Lepi- 
doptera in this respect infinitely excel them all, and to 
these, under this head, after noticing a few in the less 
privileged Orders, my observations will be confined. 
Although in the Coleoptera the wings are seldom distin- 
guished by their splendour; yet those of some Ceto- 
niade, as Cetonia africana, (Chlorocala K. MS.) are ex- 
tremely brilliant, and resemble those of many Xylocope 
in the lovely violet hue that adorns them: amongst the 
Orthoptera some Pterophylle, and in the Homopterous 
Hemiptera some Fulgore, emulate the Lepidoptera in 
the ocelli that give a kind of life to these organs*; and 
a vast number of the destructive tribe of locusts are re- 
markable for the fine colours and gaiety of their wings’; 
* Stoll Sauterelles a Sabre. Pterophylla ocellata t. i. i1., Cigales, 
Fulgora laternaria t.i. f. 1.,and F. serrata t. xxix. f. 170. 
» Ibid. Sauter. de Passage, Locusta Dux t.1. 5, L. carinata t. v. b. 
Ff. 16, L. ertstata t. Ix. b. f. 30. &e. &e. 
