36 SOME INSECTS INJURIOUS TO TRUCK CROPS. 
DISTRIBUTION. 
This leaf hopper is apparently a native of the southwestern part 
of the United States. It has been collected from about the region 
of Denver, Colo., south along the edge of the mountains, through 
New Mexico, and west through Arizona, Utah, and southern Idaho 
to the coast in California and Oregon. Though confined to the 
mountain region, its distribution is restricted to the lower levels, 
and it is never taken on the mountains themselves. From this region 
it has not spread very far up to the present time. It was taken at 
Fort Collins and Lamar, Colo., in 1901 — in one case 100 miles north 
of its known habitat, on wild plants, and in the other an equal dis- 
tance east, but was rare in both situations. In Utah it has spread to 
the northern line of the State and into Idaho as far as that par- 
ticular beet area has been extended, while it has not as yet been taken 
from the wild plants north of Ogden, Utah. 
LIFE-HISTORY STUDIES. 
Search was made for this species as soon as the growing season 
commenced in the spring of 1906, but no specimens were discovered 
in the Cache Valley, Utah, up to the time the beets came up. A 
trip to Sevier County, Utah, at the time the very earliest beets 
were just showing (April 22) failed to disclose a single individual, 
either in the beet fields or in waste places or hedgerows adjacent to 
the beet-growing districts. The first specimens discovered this sea- 
son were found at Thompsons, Utah, May 3, feeding on Russian 
thistle, and a few days later the insect was found on the same plant 
and on an annual saltbush (Atriplex) at Grand Junction, Colo. 
Beet fields were examined at Grand Junction, Colo., May 8, and 
in Utah at Lehi, May 9; Smithfield, May 12; Garland, May 13; 
Lehi, May 17; Corinne and Penrose, May 22; and Provo and Lehi, 
June 1, without finding a single leaf hopper on any of them. The 
beets were not up at Lehi on May 9, nor at Smithfield, but the fields 
were examined carefully, especially where weeds were beginning to 
appear. Fields at Logan, Utah, were under observation during all 
this time and up to July 1, but no leafhoppers were found. 
RECORD AT LEHI, UTAH. 
On June 21 a field was examined at Lehi in which there was an 
average of one or two leafhoppers to a beet. They were all adults 
and two-thirds of them females. The beets in this field were from 
6 to 10 inches across, and no sign of injury was observed. On exam- 
ining the other fields in the valley a very much smaller number of 
leafhoppers was found. Some fields had one individual to 10 beets, 
