THE SIX-SPOTTED LEAFHOPPER. 99 
In the Dakotas it was usually the most abundant species in fields of 
wheat, oats, and barley, as well as the most universally present, but 
it was not in such numbers as to be counted destructive. At Dick- 
inson, N. Dak., it was found on millet as well as on wheat and oats. 
It occurred at Mammoth Hot Springs, Yellowstone Park, in a small 
patch of cultivated grass; at Bozeman, Mont., on wheat, oats, barley, 
and timothy; at Missoula, Mont., on tame grasses; at Pullman, Wash., 
on Festuca; at Kalispell, Mont., and Williston, N. Dak., on wheat, 
oats, alfalfa, clover, millet, and brome grass; at Castalia, Ohio, 
August 13, in volunteer wheat; at Toledo, Ohio, August 13, in Hun- 
garian grass; at Valencia, Harrisburg, and Reading, Pa., in wheat or 
grass; at Arlington, Va., November 12; at Raleigh, N. C., November 
15; at Columbia, S. C., November 16; at Clemson College, S. C., in 
wheat, rye, and barley, November 17; at Knoxville, Tenn., in bar- 
ley, November 22. All these records represent adult stages, and 
adults have been observed every month from March and June to 
November. 
The life history of the species has never been given in detail, though 
brief statements concerning the nymphal period appear in some cases. 
Leonardi barely mentions ‘‘larva and nimfe”’ in connection with 
reference to the species as a pest to cereals. Some work was done 
on the life history at Ames, Iowa, years ago, but no publication was 
made, as it was hoped to complete lacking details. 
There is little separation into distinct broods, and adults, as shown 
by records above, are to be found throughout the season, probably 
because of the short period of development of the young. In Texas 
adults, as shown in reports above, were abundant March 22. Web- 
ster gives a record of adults, confined on wheat kept indoors, which 
deposited eggs on November 11, the latter hatching November 27; 
and a further note on the last-stage nymph, December 24, would 
indicate the passing nearly to adult stage within a period of about 
six weeks, with indoor conditions. With present data, it seems im- 
possible to determine definitely the number of generations during a 
season. 
The adult insect is of a light greenish-yellow color, the head 
marked very distinctly with black dots or spots arranged in pairs, 
two round spots on the hind part of the vertex, a pair of transverse 
spots a little in front of the middle, and another pair, also trans- 
verse, at the border between vertex and front. The front is marked 
with black curved lines, and the sutures are black. The elytra are 
nearly transparent, the veins showing as lighter lines near the base 
and darker lines toward the apex, which also is somewhat smoky. 
The body above is black, the border of the abdomen yellow beneath, 
the body yellow, with black for the central part of the thorax and 
the basal portion of the abdomen. 
