PEs Tey PT ONS: 
PLATES. 
Prate |. Fig. 1.—An old meadow near Ada, Minn., badly infested with leaf- 
hoppers. lig. 2.—A brome-grass pasture on the Agricultural Col- 
lege Farm at Fargo, N. Dak., badly infested with leafhoppers. - - - 
II. Fig. 1.—Experimental plats on the Agricultural College Farm, 
Fargo, N. Dak. Fig. 2—Experimental plats of the U. S. Depart- 
ment of Agriculture, at Arlington, Va. Fig. 3.—A terraced farm 
in South Carolina, showing the uncultivated terrace strips in which 
the leafhoppers breed and from which they migrate to the culti- 
SeLeC EMO OMMERO EVENS 21. cc icic's aie caida dec eeee Se Sot ea aoe es 
IIT. Fig. 1.—Wild grassland in central Kansas, including grama grasses, 
buffalo grass, etc., infested by leafhoppers (Deltocephalus, Athysa- 
nella, etc.). Fig. 2.—Wild grassland at Dickinson, N. Dak., with 
buffalo grass, grama grasses, and other native grasses, infested by 
leafhoppers (Deltocephalus, Athysanus, etc.). Fig. 3.—Small 
patch of cultivated irrigated grass in front of Mammoth Hot Springs 
Hotel, which was swarming with leafhoppers...............----- 
TV. Desert near Tucson, Ariz., containing small grasses occurring in scat- 
. Dreculacephala reticulata: Adult and details, nymph 
. Map showing distribution of Dreculacephala reticulata in the United 
. Dreculacephala mollipes: Adult and details, nymphs 
mechan communis: Adult and details, 2.22... 2. .fe2s. 22 -noun cee 
. Hecalus lineatus: Male, female, nymph, details ..................---- 
. Dorycephalus platyrhynchus: Male, female, nymphs, eggs, details... ..- 
. Parabolocratus viridis: Male, female, nymphs, eggs, details 
. Platymetopius acutus: Adult and details. . - 
. Platymetopius frontalis: Adult and details 
. Deltocephalus inimicus: Adult and details . 
. Deltocephalus inimicus: Nymphal stages 
. Map showing distribution of Deltocephalus inimicus 
. Deltocephalus nigrifrons: Adult and details 
. Deltocephalus fuscinervosus: Adult and details 
. Deltocephalus configuratus: Adult and details 
. Map showing distribution of Deltocephalus affinis 
. Deltocephalus afinis: Adult and details, nymph 
. Map showing distribution of Deltocephalus sayi 
tered clumps among the desert vegetation, which are the home of 
various species of leafhoppers. Fig. 2.—Desert west of San An- 
tonio, Tex., containing plains grasses, swarming with leafhoppers. 
Fig. 3.—Desert land near Corpus Christi, Tex., containing grasses 
CPUC See 2 Mo nil (Sel obey 0) Oe 1 ae ee RA Gen 
TEXT FIGURES. 
A leafhopper, Athysanus obtutus: Stages and structural details. ....... 
SLIGILRSSIORS oes See eesepe enya 4 Ome a a NES one en! ee eee IR US eee 
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