106 TREE-HOPPERS. 
again. They constantly pat and press them with their antennz 
as they do the Aphides. I have numbers of Aphides in my 
garden almost deserted by ants, which assiduously attended them 
before the Entilia hatched. When the larve split on the back 
the ants supervise the process, seeming to peel the empty larval 
case off. When the insect emerges one or more ants anxiously 
tend it, passing their antennz over it repeatedly. I ‘cut out’ a 
newly hatched Entilia, and it at once made for the upper side 
of the leaf. Very few are ever found on the upper side 
of a leaf. An ant was detailed to bring it back, which it 
finally did. It then stayed with the rest. Immense numbers of 
Entilia sinuata were present about one hundred feet away, and 
these were tended by medium sized black ants. A very large 
ant-hill is in the center of this flower-garden. I believe they 
attract or introduce Aphides to the vicinity of their abode. These 
were arrant cowards, and when touched dropped some five or 
six feet to the ground; otherwise they conducted themselves like 
their black and brown relatives. Twenty minutes afterwards the 
Entilias were quiet and the ants on guard. When one considers 
the fact that Entilia sinuata in perfect form can both jump and 
fly—had one jump four feet and fly ten feet from my hand this 
evening—the control that the ants maintain over them is re- 
markable. In fact, as I told the hired man (who patiently listens 
to all the new ‘old facts’ I discover), Solomon knew what he 
was talking about when he said: ‘Go to the ant, thou slug- 
gard; consider her ways and be wise.’ I am fully convinced 
both from observation and reading that ants have reasoning 
powers.” 
Ceresa bubalus Fab, (The Buffalo Tree-hopper). 
This species as well as two others closely resembling it, 
i. e. C. diceros Say and C. taurina Fitch, are very common in 
Minnesota, and are sometimes decidedly injurious, not so much 
because they abstract the sap from our fruit trees, but because 
they make slits in their twigs in which they lay their eggs. 
The Buffalo Tree-hopper (Fig. 100) is about one-third of 
an inch long, of a light grass-green color, with whitish dots and 
a pale yellowish streak along each side. On the front there is a 
sharp process or joint jutting out horizontally on each side, re- 
