60 ZYGyENID^ AND BOMBYCIDiE 



identity is to be found in the constancy of the coloring of the under sur- 

 face of the primaries in all three varieties, and in the fact that however 

 kw of the black markings of the upper surface may be present, those 

 that remain, even in omatrix, occupy exactly the same position as the 

 corresponding markings in full colored individuals. On the other hand 

 ornatrix seems to be a Mexican type; speciosa, a West Indian type, and 

 bella, a more northern type; and even in Texas, where both ornairix 

 and bella occur, the two insects retain their characteristic markings. A 

 knowledge of their larval stage can alone decide this question satisfac- 

 torily. 



