COLLOPS BIPUNCTATUS AS AN ENEMY OF THE 
COLORADO POTATO BEETLE. 
C. E. MEAD. 
On July 20, while searching the potato vines at Aztec, New 
Mexico, for insect pests, a beetle, Collops bipunctatus, was 
noticed eating a larva of the Colorado potato beetle. The 
beetle was carefully watched for about half an hour, and with 
the aid of a pocket lens I could plainly see that fully one-half 
of the larva had been destroyed and yet the beetle was gnawing 
contentedly away at the remaining portion. 
This specimen was immediately caught for the purpose of 
confining it with other larvæ of the potato beetle and noting its 
actions. 
After removing the beetle, the vine was carefully examined 
and found to have on its leaves two clusters of D. 70-dineata 
eggs; one cluster was wholly destroyed apparently by the 
C. bipunctatus; the other, which was yet in good condition, 
was preserved and placed with a few larve of the same species 
in a box containing the specimen of C. bipunctatus. The con- 
tents of the box were carefully watched, with the following 
results : 
No sooner had the beetle carefully inspected its new quarters 
than it began searching the enclosed leaves. After a careful 
review of these it first proceeded to the ones containing the 
eggs. Here it began at once to eat the eggs, and continued 
until it had eaten or destroyed six; then it crawled away and 
hid itself beneath some leaves in the corner of the box, where it 
remained in seclusion for about ten minutes. It then left its hid- 
ing place and proceeded to where the larve of the D. Zo-dineata 
were feeding upon some potato leaves. Here it stopped, sur- 
veyed its prey, and then attacked a small larva that was by 
itself at a short distance from the rest. It ate heartily, not- 
withstanding the protests of the larva, until about one-half of 
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