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Fig. 2. Vegetation map showing 12 major vegetation types found
in Wyoming, adapted from Roberts (1989). Not shown are vegetation types
associated with riparian zones or cultivated areas. Green shading = sagebrush
steppe; tan shading = mixed-grass prairie; olive drab = lodgepole pine
forest; dark green = ponderosa pine forest; light-blue = spruce-fir forest;
peach = desert shrublands; mint green = douglas fir forest; green = juniper
woodland; crimson = oak woodland; brown = sand dunes; yellow = aspen forest;
gray = alpine tundra; black = state and county borders.
Fig. 1 (Updated from the 1960-93 map) Spatial distribution of rangeland
grasshopper outbreaks in Wyoming from 1944 to 1994, with no data for 1982,
1983 or 1984 (Schell 1994). White = no recorded infestations; light shading
= 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested;
blue-green = 6-7 yr infested; red = 8-9 yr infested; orange =10-11 yr infested;
yellow = 12-21 yr infested; black = state and county borders.