LEAF-BUGS. 59 
This standard emulsion, if covered and placed in a cool, dark 
place, will keep for a long time. In making a dilution from 
this cold emulsion, it is necessary to dissolve the amount re- 
quired in three or four parts of boiling water, after which cold 
rain water may be added in the required quantities. 
“The kerosene emulsion, diluted with five parts of water, 
should be applied to the young insects as soon as they appear 
in May. 
“Since the insect winters in the egg state, which are securely 
placed near the tips of the new growth, burning of the garden 
rubbish in the fall will not affect the pest in the least, but prun- 
ing and burning the infested twigs will prove a practical and 
effective means to reduce their numbers. 
“Probably the best method for general practice, especially 
against the adults on herbaceous plants, will be to capture the 
bugs by jarring them into a dish partly filled with kerosene and 
water. On currants, gooseberries, sage, and other shrubs, one 
should not wait until the adults appear, but should capture the 
nymphs in May. 
“Thus there are three practical methods by which this pest 
can be controlled: kerosene emulsion for nymphs; destruction 
of the eggs by pruning; and the capture of the nymphs and 
adults by jarring into receptacles, where they are destroyed. 
Circumstances will largely determine which method will prove 
the most practicable in specific cases.” 
Besides all kinds of cultivated and wild currants a large 
number of other plants are more or less injured by this pest. 
Prof. Slingerland has given a list of about fifty different plants 
upon which the bug occurs, showing a surprisingly wide range 
of food plants. In this list we find radish, clover, pea, goose- 
berry, squash, cucumber, parsnip, lettuce, potato, rose, and 
many other cultivated plants. This fact makes it so much more 
difficult to control the insect; if driven away from one kind it 
can simply fly to another one to escape, and for this very reason 
growers of currants and gooseberries should be very vigilant to 
destroy the insect pest before it becomes numerous. 
Some insects belonging to the Capsidze are remarkable for 
mimicking ants. Prof. Osborn, who is making a specialty of 
the Hemiptera, describes a handsome little Capsid, which pre- 
