48 LEAFHOPPERS AFFECTING CEREALS, ETC. 
collecting. Some especially good records, however, were secured 
with reference to the food plants and habits of species occurring on 
the native grasses. (See PI. IV, fig. 3.) 
At San Antonio, Tex., February 28 and March 1, most of the time 
was spent on the Collins irrigation farms and at the Government 
experiment station, which furnished an excellent opportunity to 
compare the conditions in irrigated and nonirrigated areas. (See 
PL IV, fig. 2.) In both places a number of the common species were 
present, but the abundance differed very decidedly for some of them, 
showing that they flourished much better in the moist locality. 
At El Paso, Tex., the hillsides presented a very barren condition* 
the grasses being absent or completely dried up and no leafhoppers 
were found in these localities. In a small irrigated tract near the 
city several species were fairly swarming and I found here also a 
species of Stictocephala quite abundant in grass. At Tucson, Ariz., 
several days were spent, March 6 to 9, where the assistance of the 
officers of the Desert laboratory and of the Arizona College of Agri- 
culture was obtained. Collections from the cultivated plats of 
barley, grasses, and alfalfa, as well as from the native desert grasses 
(see PI. IV, fig. 1) were made. 
At Tempe, Ariz., in the irrigated sections of the Salt River Valley, 
where many forage crops are grown and where wheat has been culti- 
vated probably for many centuries, particular attention was given to 
the wheat fields and alfalfa, clover, and grass. A number of the 
common widely distributed species occurred here and some of these in 
considerable abundance, although in no case were they so plentiful 
as to be causing noticeable injury. 
At Yuma, Ariz., and Fort Yuma, Cal., considerable numbers of 
leafhoppers occurred in the irrigated fields of alfalfa, clover, and 
wheat. On Bermuda grass and in some of the native grasses in non- 
irrigated fields a number of species were secured evidently belonging 
to the native fauna. 
In the irrigated section of the Imperial Valley collections were 
made at El Centro and Brawley, CaL, and a variety of crops, including 
barley, oats, alfalfa, and Bermuda grass, were examined. Very few 
leafhoppers were found in the oats and barley, but the alfalfa was 
infested considerably, and the Bermuda grass included several species 
that were fairly plentiful. 
In the vicinity of Ontario, Pomona, and Chino, CaL, there were 
opportunities to examine fields of alfalfa, oats, barley, and Bermuda 
and native grasses, but for the most part leafhoppers were very scarce 
and in some fields only one or a very few specimens could be dis- 
covered after dilligent search. On alfalfa the most common species 
of leaf hopper was an Agallia. The native grasses were but slightly 
infested and very few species were represented. 
