106 LEAFHOPPERS AFFECTING CEREALS, ETC, 
a southwestern habitat since introduction of its host plants. Such a 
history would accord well with the fact that no mention of the species 
was made by Say or other writers during the first three-fourths of 
the nineteenth century. It seems hardly possible that it could have 
escaped them if it had occurred in its present abundance and wide 
distribution. In whichever direction it may have been dispersed it 
seems quite certain to have been in connection with cultivated crops, 
as it does not occur in the uncultivated areas to which some of its 
congeners seem well adapted. A similar tendency to adopt alfalfa 
and clover is, I believe, manifested by Agallia uhleri, which recently 
has been taken in abundance on these crops by Mr. C. N. Ainslie at 
Mesilla Park, N. Mex. 
TREATMENT. 
Owing to the habit of adult hibernation, the winter or early spring 
burning of rubbish and dead leaves where they occur is likely to be 
quite effectual in their reduction and where they occur in destructive 
abundance the spraying of alfalfa or clover fields directly after cutting 
a crop should be of distinct advantage. 
The species has been noticed to harbor considerable numbers of 
minute hymenopterous parasites, probably of the genera Dryinus or 
Gonatopus, and it is very likely that these parasites assist in keeping 
their numbers within such bounds as to prevent very notable injuries. 
