抄録
Coloration and external characters of the two types of Hyphantria cunea (DRURY) which differ in behavior and their hybrids are described. Considerable differences were found in color of the larvae between them but no other taxonomical difference could be found in the larval and pupal stages. There was a slight difference in the male genitalia between the two types, but individual specimens could not be identified due to the overlapping ranges of variation. The distribution of color patterns in F2 larvae suggested that the larval color is not determined by a single pair of alleles.
