HAWK-MOTHS. 49 
caudal-plates are brown. When this caterpillar is ready to 
change to a pupa it changes to a beautiful pink or crimson 
color. The young larva is green, with a long and slender 
horn rising from the eleventh segment and curving over the 
Fig. 38.—Philampelus achemon Drury. a, moth; b, egg; c, young larva; d, mature 
larva; e, pupa; f. parasitized larva—all natural size. From Div. of Entomology, 
Department of Agriculture. 
back. In the older and fully grown specimens this long horn 
has disappeared, and in its place is found a highly polished 
lenticular tubercle. 
The large pupa is formed in a smooth cell several inches 
below the surface of the ground; it is of a dark, shining 
