I had never seen an insect like this before. This is what I found out about the Green Tiger Beetle:
With the sun shining off its irisdescent blue-green elytra, the green tiger beetle resembles an emerald lost on a sandy path. A closer inspection usually reveals nothing—the "emerald" has flown several feet down the path.
Green tiger beetle adults are slender predatory beetles with long legs, large eyes, and thread-like antennae. Like all chewing insects they have a pair of mandibles. The tiger beetle's mandibles are sickle-shaped and very sharp pointed, with several teeth on the inner face. The name tiger beetle refers to its predaceous habits (both adults and larvae eat all kinds of insects) and to the ability of the adults to suddenly pounce on their prey.
During the summer months females will deposit their eggs in sandy soil. The eggs are deposited singly, each in a separate burrow. The larvae are whitish, S-shaped and grub-like with long curving jaws and a large hard head. The larvae prop themselves up in vertical burrows with their oddly shaped heads often plugging the entrance. They wait with open mandibles for a hapless victim, which they seize and take to the bottom of the burrow (sometimes a foot below the surface) to devour at their leisure. On the larva's 5th abdominal segment is a spine that anchors it to the side of the burrow. Thus, if a larva grabs an insect that is too large to overcome, it is anchored to the burrow and will not be pulled out.
"May" texture courtesy of Kim Klassen.
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