72 LEAFHOPPERS AFFECTING CEREALS, ETC. 
While perhaps not so destructive as to require particular discussion of 
remedies, it may be said that it would be affected by the same treat- 
ment as that applied to the other grass-feeding species, but would 
not be destroyed quite so commonly in the treatment applied to 
the short grass of pastures or to closely mown fields. 
Platymetopius cinereus Osb! and Ball. 
The species Platymetopius cinereus Osb. and Ball has not been 
observed for anything like the extent of range or abundance noted 
for the other species mentioned, but in a few instances has been found 
to occur in considerable numbers. It is a smaller and lighter colored 
species than acutus, the female being only about one-sixth inch in 
length and the male still smaller. The larvae are distinguished from 
those of acutus by the absence of the red color and the dorsal stripe, 
and from those of frontalis by the much more elongate form. 
The nymphs of this species have been observed early in June, but 
nearly full grown, so that they must have been developing during 
the latter part of May, and by the middle and latter part of June 
they are replaced by adults, which are found in decreasing numbers 
until after the middle of July. Nymphs of a second brood are noted 
by the last of July, and remain in abundance up to the middle of 
August. These again are replaced by adults which begin to appear 
by the second week in August and continue on through September. 
The species is known from Iowa through Nebraska and Kansas to 
Arizona. It appears to develop especially on three different kinds 
of grasses, Andropogon scoparius, Bouteloua Jiirsuta, and B. curti- 
pendula, the latter two species probably being its most common hosts. 
It is therefore more particularly of importance in the plains region, 
where the wild grasses form an important part of the forage, and so 
far as known need not be considered as of importance to the ordinary 
cultivated grasses of the Mississippi Valley or the Eastern or South- 
eastern States. 
The Inimical Leafhopper. 
(Deltocephalus inimicus Say.) 
The Deltoceplialus inimicus of Say (figs. 11, 12) is one of the most 
widespread and injurious species among the leafhoppers, but never- 
theless it has received comparatively little notice in economic litera- 
ture. It was first described in 1831 by Thomas Say, who states in 
connection with the description that when in the larval state this 
species is said to depredate on the roots of wheat. " Several speci- 
mens were sent me by Prof. Green, in the year 1822, who received 
several from a farmer in Virginia." This would place the recogni- 
tion of the species as an injurious pest as far back as 1822, nearly a 
