• 38 



and irregular, but in others their periods of numbers are as fixed and regular as that of 

 the seventeen year locust. . 



For j'oung trees which are easily accessible the caterpillars may be collected by hand 

 and destroyed. 



As the moths, being night fliers, are not very often seen, it might be a good idea to try 

 the entomologist's plan for collecting moths viz : Placing a piece of rag saturated with sugar 

 at night on the trunk of the tree, and visiting it occasionally with a lantern, and capturing 

 with a net auy of the moths that are sure to be found feeding on the attractive sweets. 



3. THE AMERICAN SILK WORM {Idea Polyphemus, Linn.) 

 Order, Lepidoptera ; Family, Bombycid^'„ 



Fig. 28. Female. 



Fig. 29. 



M.il«. 



^.T'olouit — Dull ochre yellow — purplipli b.nnds anil eu? 



