ILLUSTRATIONS. 



PLATES. 



Pfege. 

 Plate. I. The gi^sy moth (Porthetria dispar). Fig. 1. — Male moth. Fig. 2. — 

 Female moth. Fig. 3. — Male pupa. Fig. 4. — Female pupa. Fig. 



5. — Egg cluster. Fig. 6. — Caterpillars Frontispiece. 



II. Woodland area in Massachusetts defoliated by the gipsy moth 9 



III. Fig. 1. — Egg clusters of the gipsy moth on trunk of apple tree, 



Wallingford, Conn., December, 1909. Fig. 2. — Egg clusters of the 

 gipsy moth on stone wall 12 



IV. The brown-tail moth (Euproclis chrysorrhcea). Fig. 1. — Cocoon. 



Fig. 2. — Male moth. Fig. 3. — Female moth. Fig. 4. — Egg clus- 

 ter on leaf . Fig. 5. — Caterpillars feeding on leaf 22 



V. Woodland at Lexington, Mass., completely defoliated by the gipsy 



moth 38 



VI. Same woodland at Lexington, Mass., as that shown in Plate V, the 



following year, illustrating beneficial effects of control work... 38 

 VII. View of woodland near roadway at Weston, Mass., showing effect of 



control measures against the gipsy moth 44 



VIII. Lumber piles at York, Me., infested with egg clusters of the gipsy 



moth GO 



IX. Fig. 1. — Pine grove killed by the gipsy moth. Fig. 2. — Pine trees 



that have been protected from the attacks of the gipsy moth 62 



X. One of the ten high-power spraying outfits used in the gipsy moth 



work of the Bureau of Entomology 66 



XI. High-power spraying outfit in use in treating roadside trees 66 



XII. View showing contrast between trees protected from the gipsy and 



brown-tail moths and those unprotected 72 



XIII. Map showing dispersion and present distribution of the gipsy 

 moth in New England, and limits of area infested by the brown- 

 tail moth, in 1909 74 



TEXT FIGURES. 



Fig. 1. Roadside view in Massachusetts, showing oak and ash trees, the former 

 killed by the gipsy moth (Porthetria dispar) and the latter prac- 

 tically uninjured 14 



2. Pine trees killed by the gipsy moth 15 



3. Trunk of pine tree, showing tanglefoot band and egg clusters that 



have been treated with creosote 19 



4. Winter webs of the brown-tail moth {Euproclis chrysorrhcea) 23 



5. Oak tree in winter, showing webs of the brown-tail moth at tips of the 



branches 23 



6. Brown-tail moths on electric light pole, Somerville, Mass., July 2, 1908 . 24 



7 



