LEPIDOPTERA. 
259 
color, more or less spotted with black; it expands about 
half an inch. The common name is derived from the fact 
that it has been very destructive in the province of Angou- 
mois, France. 
Family SESIID/E (Se-si'i-dae). 
The Clear-zvinged Moths or Sesiids (Se*si-ids). 
The Clear-winged Moths constitute a very remarkable 
family, many of them resembling bees or wasps in appear¬ 
ance more than they do ordinary moths, a resemblance 
due to their clear wings and in some cases 
to their bright colors (Fig. 304). There are a 
few moths in other families, as the Clear¬ 
winged Sphinxes, and certain Zygaenids, 
that have a greater or less part of the wings 
devoid of scales; but they are exceptions. Fig * 3 °*- 
Here it is the rule that the greater part of one or both pairs 
of wings are free from,scales; hence the common name 
Clear-winged Moths. 
These insects are of moderate size; as a rule they have 
spindle-shaped antennae, which are terminated by a small 
silky tuft; 
sometimes the 
antennae are 
pectinate; the 
margins of the 
wings and the 
veins of even 
the clear¬ 
winged species 
are clothed 
with scales ; 
and at the end 
of the abdo¬ 
men there is 
a fan-like tuft of scales. 
The fore wings are remarkable for their extreme narrow- 
