328 
THE STUD V OF INSECTS. 
wings yellow (Fig. 403). A variety of this species occurs in 
California in which the lighter parts of the wings are pinkish 
instead of yellow. These moths occur in stony places, 
where the larvae feed on lichens growing on rocks. 
In the extreme southern part of our country and in the 
regions south of that, there occur highly specialized mem¬ 
bers of this family, in which the hind wings are greatly re¬ 
duced in size, and the veins of the hind wings coalesce to a 
remarkable degree. In some of these forms the discal por¬ 
tion of the wings bears but few if any scales. Cosmosoma 
aage (Cos-mo-so'ma au'ge) from Florida (Fig. 400) will serve 
as an example of these. In this species the body and legs are 
bright red, with the head, end of abdomen, and a dorsal band 
blue-black ; the veins and borders of the wings are also black. 
Family THYRIDID2E (Thy-rid'i-dae). 
The Windozv-winged Moths . 
These little moths can be easily recognized by the presence 
of curious white or yellowish translucent spots upon the 
wings ; it is these spots that suggests the name Window¬ 
winged Moths for the family. 
In this family the antennae are either strictly filiform or 
slightly thickened in the middle ; 
the ocelli are wanting ; the palpi 
project horizontally, and are 
somewhat longer than the head ; 
and the maxillae are strongly 
developed. The venation of the 
wings differs from that of all 
other families of moths, in that 
all five branches of radius of the 
fore wings are preserved and arise 
from the discal cell (Fig. 404).* 
A similar type of venation is 
* In a single genus of the Pyromorphidae, Triprocris (p. 227, Fig. 268), 
all the branches of radius arise from the discal cell. 
Fig. 404.—Wings of Thyris maculata. 
