356 
THE STUDY OF INSECTS . 
of the Promethea Moth in color and markings, and thus 
differs decidedly from the male of that species. 
The Cecropia Moth, Sarnia cecropia (Sa'mi-a ce-cro'pi-a).— 
This is the largest of our Giant Silk-worms, the wings of the 
adult expanding from five to six and one half inches. The 
ground color of the wings is a grizzled dusky brown, espe¬ 
cially on the central area. The wings are crossed beyond the 
middle by a white band, which is broadly margined without 
with red, and there is a red spot near the apex of the fore 
wing just outside of a zigzag line. Each wing bears near 
its center a crescent-shaped white spot bordered with red. 
The outer margin of the wings is clay-colored. The larva 
is known to feed on at least fifty species of plants, including 
apple, plum, and the more common forest trees. When full 
grown it measures from three to four inches in length and is 
dull bluish green in color. The body is armed with six rows 
of tubercles, extending nearly its entire length, and there is 
an additional short row on each 
side on the ventral aspect of 
the first five segments follow¬ 
ing the head. The tubercles on 
the second and third thoracic 
_ , o . segments are larger than the 
FIG. 43 6.—Sarnia cecropia t pupa. , , „ 
others, and are coral-red. the 
other dorsal tubercles are yellow, excepting those of the first 
thoracic and last abdominal segments, which with the lateral 
tubercles are blue; all are armed with black bristles. The 
Fig. 437 .—Samia cecropia , cocoon. 
