65 
[ 325 ] 
Of these insects, the first five are ground beetles, and are pre* 
iaceous both in the larva and perfect states, and they devour the 
Potato-beetles and their larvae, mostly on the ground or whilst 
andergoing their transformation beneath the surface. 
The next three attack them on the vines. 
The next four belong to the family of Lady-bugs and help to 
lestroy the Potato-bugs by eating their eggs. 
The four Hemipterous insects are all predacious. They attack 
he Potato-bugs wherever they can find them and kill them by 
mncturing them with their beaks and extracting their juices. 
Ho. 17 is a large, savage two-winged fly, which, it would 
eem, attacks almost any insect that comes in its way. Its specific 
iame means bee-eating, and it is the same insect which has been 
ailed the Nebraska Bee-killer. It als<? kills Horse-flies, and now 
' proved to add the Potato-beetle to its indiscriminate bill of 
^re. I received a pair of these insects from Hr. A. P. Wliitney, 
f Franklin Grove, who caught them in the act of seizing and 
irrying o if the mature beetles. These ferocious insects resemble 
le hawk in their mode of dealing with their prey. They seize 
, fly off with it for a short distance and then alight and devour 
at their leisure. Whilst so engaged they allow themselves to 
3 approached quite nearly, and are easily captured. Mr. Whit- 
ey followed a number of them, and got possession of the beetles, 
hich he always found dead by the time he could reach them. 
Ho. 18 is a parasitic fly, belonging to the family of TaehinidcB % 
e larvae of which live in the bodies of the Potato-bugs, and thus 
istroy them. It was actually bred by Mr. Riley from the infested 
sects, and I have several times seen this fly or another similar 
ecies alight upon the vines in the midst of the beetles and their 
rvse. 
[Hi'\" . [ ' ^ • «y;>(> i • ,«/ £ j > 
No. 19 is commonly known as the Daddy-Long legs, and I place 
iin the list of Colorado Potato-bug destroyers on the authority of 
r * Arthur-Bryant, as given in the Transactions of the Illinois 
brticultural Society, Yol. I, page 102. To this list may be added, 
ough with some doubt, the Little-lined, or Tarnish Plant-bug 
kpsus linearis). Early in the season, I received a letter from 
r. James Taylor, of Somonauk, in which, amongst other matters, 
spoke of a small insect which pierced with its beak and de- 
oyed the eggs of the Colorado Potato-beetle. As I could not 
Yol. II—41 
