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EXPLANATION TO PLATE I. 
Fig. 1. — Rocky Mountain Locust: a, a, a, female in dilferent positions, oviposit- 
ing; b, egg-pod extracted from ground, with the end broken open; c, a few eggs 
lying loose on the ground ; d, e, show the earth partially removed, to illustrate an 
egg-mass already in place and one being placed ; /, shows where such a mass has 
been covered up. (After Riley.) 
Fig. 2. — Rocky Mountain Locust : Anal characters of female, showing horny valves. 
(After Riley.) 
Fig. 3. — Rocky Mountain Locust: Enlarged end of body of female, showing the 
method of oviposition ; ;', the oviduct; g, the egg-guide, and egg issuing from horny 
valves. (After Riley.) 
Fig. 4.— Egg of Rocky Mountain Locust: a, showing sculpture of outer shell; 
b, the same, very highly magnified; c, the inner shell just before hatching. (After 
Riley). 
Fig. 5. — Egg-mass of Rocky Mountain Locust : a, from the side, within burrow; 
b, from beneath; o, from above, enlarged. (After Riley.) 
Fig. 6. — The Drum Locust-crusher: Plan view. 
Fig. 7. — The Drum Locust-crusher : Vertical section. 
EXPLANATION TO PLATE II. 
Fig. 1.— The Simpson Locust-crusher: Perspective view. 
Fig. 2.— The Simpson Locust-crusher : Sectional view. 
Fig. 3.— The Simpson Locust- crusher: Sectional view, when ready to 
remove the insects. 
Fig. 4. — The Hoos Locust-crusher : Top view. 
Fig. 5.— The Hoos Locust crusher : Vertical section. 
EXPLANATION TO PLATE III. 
Fig. 1.— The Hoos- Locust-crusher : Side view. 
Fig. 2. — The Hansberry Lucust-crusher : Top view. 
Fig. 3. — The Hansberry Locust- crusher: Front view. 
Fig. 4. — The Hansberry Locust-crusher : Sectional view. 
Fig. 5.— The Hansberry Locust- crusher: Slide attachment. 
Fig. 6. — The Kenworthy Locust-machine : Plan view. 
Fig. 7. — The Kenworthy Locust-machine : Side view. 
EXPLANATION TO PLATE IV. 
Fig. 1. The Peteler Locust- crushing Machine : Front view, 
EXPLANATION TO PLATE V. 
Fig. 1. — The Peteler Locust-crushing Machine: Side view. 
Fig. 2. — The King Suction Machine : Front view. 
EXPLANATION TO PLATE VI. 
Fig. 1.— The King Suction Machine : Side view, in operation. 
EXPLANATION TO PLATE VII. 
Fig. 1. — The Canfield Coal-oil Pan: Perspective view. 
Fig. 2. — The Canfield Coal-oil Pan : Longitudinal view. 
Fig. 3.— The Adams Locust-pan. 
