370 
THE STUDY OF INSECTS. 
taining a sort of silky down. This is supposed to be a 
scent-organ. When this pocket is tightly closed it is diffi¬ 
cult to see it. 
Nearly seventy species belonging to this subfamily have 
been found in America north of Mexico. The following 
are some of the more common of these:— 
The Silver-spotted Skipper, Epargyreus tityrus (Ep-ar- 
gy're-us tit'y-rus). — This skipper is represented on our 
colored plate (Plate I, Fig. 4). It is dark chocolate-brown, 
with a row of yellowish spots extending across the fore 
wing and with a large silvery-white spot on the lower side 
of the hind wing. It is found in nearly the whole United 
States, from Massachusetts to California, except in the 
extreme Northeast and Northwest. The larva (Fig. 450) 
feeds upon various papilionaceous plants. We have found 
it common on locust. It makes a nest, within which it re¬ 
mains concealed, by fastening together, with silk, the leaf¬ 
lets of a compound leaf (Fig. 452). 
Fig. 452.—Nest of larva of Epargyreus tityrus. 
The Long-tailed Skipper, Eudamus proteus (Eu'da-mus 
pro'te-us).—This Skipper by the shape of its wings reminds 
one of a swallow-tail butterfly, the hind wings being furnished 
with long tails. It expands about one and three fourths 
inches; and the greatest length of the hind wings is about 
one and one fourth inches. The wings are very dark choc¬ 
olate-brown ; the front wings contain several silvery-white 
spots; and the body and base of the wings bear metallic- 
