
238 POLYGRAPHUS MAFOR, MS. 
Points in the life history requiring further observation. 
1. The number of egg galleries bored from each pairing 
chamber and the number of eggs laid in each. 
Does the number vary in different trees attacked, 
and is it constant for any one species of tree ? 
2. Does each @ bore only one egg chamber? 
3. The exact number of generations in the year. Are 
there ever four or five ? 
4, Time passed in the various stages of each generation 
or life cycle, 
