37 8 the study of insects . 
with black lines on the veins. Between the two rows of 
spots on the hind wings there are many blue scales; these are 
more abundant in the female. Near the anal angle of the 
hind wing there is an orange spot with a black center. On 
the lower surface of the wings the yellow markings become 
mostly orange and are heavier. 
This species is found throughout the United States and 
in the southern parts of Canada. 
The Tiger Swallow-tail, Jasoniades glaucus (Jas-o-ni'a-des 
glau'cus).—The larva of this butterfly (Fig. 458) is even more 
striking in appearance than that of the 
preceding species. When full grown it is 
dark green, and bears on each side of the 
third thoracic segment a large greenish- 
yellow spot, edged with black, and enclos¬ 
ing a small purple spot bordered with 
black. This caterpillar has the curious 
habit of weaving upon a leaf a carpet of 
silk, upon which it rests when not feed¬ 
ing; when nearly full grown, instead of 
spinning a simple carpet as before, it 
stretches a web across the hollow of a 
leaf and thus makes a spring bed upon 
which it sleeps (Fig. 458). 
In the adult state two distinct forms of 
this insect occur. These differ so greatly 
in appearance that they were long con¬ 
sidered distinct species. They may be 
larva upon its bed. distinguished US follows I - 
(1) The Turnus Form .Jasoniades glaucus turnus .—The 
wings are bright straw-yellow above, and pale, faded straw- 
yellow beneath, with a very broad black outer margin, in 
which there is a row of yellow spots. On the fore wings 
there are four black bars, extending back from the costa ; the 
inner one of these crosses the hind wings also. This form 
