6 
BULLETIN 964, U. S. DEPARTMENT OF AGRICULTURE. 
each field was found to be quite uniform excepting along the fences, 
where the plants were most seriously affected, leaves being discolored 
and dropping off, and the plants dying in frequent instances. 
It was observed that the injury caused to alfalfa by Halticus citri 
very closely resembled that of the red spider (Tetranychus bimacu- 
latus Harv.) . 
All the cereal and forage and truck crops, wild mulberry trees, 
peach trees, and a large number of weeds, including the briar and 
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Fig. 3.— At the right, normal healthy leaves of red clover. At the center and left, leaves seriously af- 
fected by the garden flea-hopper. 
species of the mint family, were found infested with this insect. 
More noticeable damage, however, was shown by alfalfa, cowpeas, and 
clover than by other growing crops. 
DAMAGE TO ALFALFA. 
The injury which is inflicted on alfalfa and other plants is caused 
by both adults and nymphs. Damage is done by means of their 
sharp pointed mouth-parts which are inserted into the plant tissues. 
The short chitinized beak is thrust through the surface of the leaf or its 
