92 LEAFHOPPERS AFFECTING CEREALS, ETC. 
in late September and mostly disappearing by the last of October. 
It would seem that the eggs are deposited rather early in the 
autumn as the adults are not found as late as those of some of the 
species of Deltocephalus. 
The species is open to the same methods of attack as Deltocephalus 
wmnucus, and for the most part the time of application would coincide 
very closely. 
ATHYSANUS BICOLOR Van D. 
The species Athysanus bicolor Van D. has been observed more com- 
monly and in greater abundance in southern localities than to the 
north, and is evidently a member 
of a subtropical fauna, as its dis- 
tribution extends southward from 
the Southern States into Mexico 
and Central America, where it has 
been observed as far south as 
Guatemala. Its northern range is 
probably about to the Great Lakes, 
as it has been found in Maryland, 
Ohio, Illinois, and Iowa, west to 
Kansas, and then southward. Its 
range of food plants has not been 
determined with any completeness, 
but it does not appear to occur with 
any frequency on the cultivated 
species of grasses or grains, and 
hence has not the same economic 
importance as some of the other 
species. 
KR. bicolor In color the females are yellowish 
Fig. 23.—Aduetnus bicolor: a, Adult female; b, green, with two large coalescent 
sa al: en deat eta: m5" spots on. the vertex, both margins 
(After Osborn and Ball.) of the pronotum, the entire claval 
suture, and the tip of the wing black; below, all light. The males 
have the whole point of the vertex, the sutural margin, and an oblique 
band from the anal cell to the center of the costal margin black. 
Below, all is black except a band across the middle of the face. This 
species can be readily separated from curtisia by the absence of the 
Y on the face and the fact that the yellowish-green of the elytra is not 
confined to the nerves. (See fig. 23.) 
The nymphs are very light yellow, sometimes almost white, and the 
hairs are much smaller and finer than those of curtisii, which other- 
wise they closely resemble. They were first taken June 16, when the 
first adults of a brood were issuing, nymphs remaining abundant until 
the end of the month. The adults were very abundant until well 
oe 
e WH 
