ILLUSTRATIONS. 
PLATES. 
Page. 
Plate I. Gipsy-moth egg clusters on charred wood on the edge of a stream, 
Saugus, Mass. , May, 1912 8 
II. Female gipsy moths depositing eggs on oak foliage, Melrose, Mass.. 8 
III. Lumber piles at York, Me. ; gipsy-moth egg clusters on upturned board 
at right of foreground 8 
IV. Crow's nest in top of pine tree 16 
V. Gipsy-moth caterpillar, showing aerostatic hairs. Fig. 1. — First- 
stage larva. Fig. 2. — Tubercule from first-stage larva, showing 
hairs 16 
VI. Trap moored in pond to test aviation of gipsy-moth larvae 16 
VII. Trap built on top of observation tower to test aviation of gipsy-moth 
larvae 20 
VIII. Screens treated with tanglefoot attached to water tower to test avia- 
tion of gipsy-moth larvae 20 
IX. View of salt marshes near Lynn, Mass., where experiments on aviation 
of caterpillars were conducted; post and box used in experiments. 20 
X. Portable screens used for caterpillar-aviation experiments 20 
XI. Fig. 1. — Female gipsy moths depositing egg clusters on white-oak 
tree near the ground. Fig. 2. — Egg clusters on stone wall 28 
XII. Oak tree showing gipsy-moth caterpillars spinning to the ground 28 
XIII. Solid white-pine block near Nashua, N. H 28 
XIV. Row of large maple nursery stock infested by the gipsy moth 40 
XV. Gipsy-moth egg cluster on small Norway spruce tree in nursery row. 40 
XVI. Weeping mulberry showing bird's nest and near by two gipsy -moth 
egg clusters 40 
TEXT FIGURES. 
Fig. 1. Diagram showing maximum and minimum temperature before and 
after hatching of eggs of the gipsy moth, 1908-1911 26 
2. Female pupal case and egg clusters of gipsy moth on stone foundation 
under woodwork of house 29 
3. Diagram showing the proportion of time the wind blew in each direction, 
when wind spread was possible, during April and May, 1902-1911. . 36 
4. Map showing location of towns and cities in New Hampshire and Massa- 
chusetts where scouting records have been consulted to compare the 
relation of infestation to wind spread 44 
5. Map of town of Boylston, Mass. , showing increase in gipsy-moth-infested 
localities, 1909-10 and 1910-11 47 
6. Map showing towns and cities in New England where woodland scout- 
ing was done, 1911-12 52 
MAP. 
Map 1. Showing dispersion and present distribution of the gipsy moth in New 
England 40 
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