VOL. XIV. (2) INTELLIGENCE IN ANIMALS I2I 
The larve of the water beetle, Dy¢escus marginalts, are 
watchful for their prey ; often stealthy in approaching it; 
but violent and- energetic when their attack is delivered. 
I witnessed similar stealth and sudden impetuosity in a 
species of solitary wasp, which preyed on an agile and 
swift drone-fly, and only captured it after a watchful and 
protracted pursuit, culminating in a swift attack at the very 
moment when the fly was tasting the juices of a flower. 
This wasp, sitting on a leaf, would turn eagerly to observe 
any passing insect, and, if the latter were above, would 
raise its fore-part till the supporting front legs were almost 
straight. This seeming anxiety, however, never induced 
an immediate attack on the desired fly, when it appeared. 
The most entertaining insect I have seen is the in- 
telligent Zatpoda sulphurea, of Western Canada, a large 
black Grasshopper, whose knowledge of its habitat and 
extraordinary noisiness, render it particularly attractive. 
No insect could more deserve an introduction to our 
countryside than this one, which was unknown even at 
South Kensington until I produced a specimen for 
identification. Its bright green under-wings render it 
conspicuous in its alternately irregular and sailing flight, 
when it sets out on little excursions, stopping on favourite 
roofs or sunny places to bask for a few minutes, and 
passing on; often making a loud snapping noise. One I 
saw closely pursued by a hen, saved itself by making this 
noise in the moment of greatest danger and thus confusing 
the hen, which was obviously puzzled by the sudden 
outburst. 
The tracks of earthworms on roads, as seen after wet 
nights in late autumn, winter, or early spring, indicate 
such intelligence as a deliberate change of direction 
implies. Many of these tracts lie partly in rings, showing 
how a worm, coming from the side of the road, has 
apparently got lost in the middle of it, and has wandered 
