This constellation is located in front of Orion constellation and it get its name "Scorpion" because of Chinese mythology, where it takes place in a bigger constellation called "Azure Dragon" and symbolizes the start of the spring. In the other way, greek mythology tells us the story of a scorpion which was send by the godness Artemis to hunt Orion, who crushed the scorpion and both died, then Zeus placed Orion in front of Scorpion in the sky, because he didn't want to them fight.
If you want to locate it:
Scorpius is a Northern Summer Constellation, so you can see it (if you are in the northern hemisphere) during summer. The best time to see it is at 21:00 in July. 
Scorpius lies in the Milky Way, the part of our galaxy thick with stars. You will need to be able to get a clear look at the horizon to see all of Scorpius. Focus your attention on Antares (the reddish star that dominates this area of the sky). This is the heart of Scorpius, it will be above the horizon. To the right of Antares, you’ll see the head of Scorpius (which is made up by five stars).
You’ll be able to see the Libra constellation beyond these stars.
The top of Scorpius looks like a small curve of stars, with the curve coming back toward Antares, look to the southwest of Antares to see the rest of Scorpion’s body. Anyway, the Scorpius looks very much like a fish hook or a wavy letter “J”. From Antares and down, the stars complete this shape, culminating in the tail of the scorpion. There is a small triangle of stars that form the stinger.
