Fig. 1. The White marked Tussock Moth ( Hemerocampa lewcostigma Smith and 
Abbot) 1. a. Mature larva; b. adult female; 2. adult male; 3. a. Tarva; 
b. adult female on cocoon; c. egg mass on cocoon; d. adult male. 
4. Mature larvae. 
A STUDY OF THE WHITE MARKED TUSSOOK MOTH 
SUSANNAH POULTER 
Early in the winter of 1921-22 it was observed that egg masses 
of the white marked tussock moth, Hemerocampa leucostigma 
Smith and Abbot were unusually abundant. Taking advantage 
of this opportunity it was planned to make a careful study of 
the life history of that interesting insect. This insect is of con- 
siderable economic importance in that the larvae when abundant 
defoliate trees of various species. 
