20 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESOTA—1918 
Helen A Sanborn ,del 
PLATE I 
Fig. 1. Adult of A. arcuatus. Fig. 2. Adult of A. arcuatus var. torquatus. 
Fig. 3. Egg shown in position on an oak twig. Fig. 4. diagramatice view of a larval 
burrow. The figures represent the comparative length of instars. 4b shows the 
way a burrow is often continued. 
