From Nookipedia, the Animal Crossing wiki
The Darner Dragonfly (ギンヤンマ, Gin'yanma) is a large insect that flies slowly around town. It is quite common and is easily recognized by its thin body and large wings. It is worth 200 Bells.
Donating to the museum
In Animal Crossing
"<Player>, have you ever peered closely into a dragonfly's eyes? Blech! Ghastly, really"
In Wild World
Although reluctant, Blathers will add the Darner Dragonfly to the museum's collection. He will also give a short speech about it;
"Tell me, were you aware dragonflies lay their eggs in the water? They do. Juvenile dragonflies are called "nymphs", you know. And they're grotesque too... Yes, sadly, not even youth can render vile insects attractive, I'm afraid."
The dragonfly can be found flitting about in the second room of the insect exhibit after being given to the museum. Every now and then, it comes in to rest on a patch of weeds in the centre of the exhibition space.
In City Folk
Blathers will accept the Darner Dragonfly for addition to the museum's insect exhibit:
"At first glance, the darner dragonfly, like all dragonflies, appears to be quite a sleek bug, wot? But in its larval stage, this bug is a beastly little carnivore... I suppose if one were being eaten, one wouldn't care if whoever was doing the devouring looked sleek..."
After donation, the Darner Dragonfly can be seen flying around on the lower level of the insect room. Occasionally, it will land on the water of the nearby pond for a few seconds.
In New Leaf
Upon being donated, the dragonfly can be found in the first room of the bug exhibit, flying around the pond and occasonally resting on the fence. The exhibit has this to say about the Darner Dragonfly:
"The heads and thoraxes of darner dragonflies are colored a lovely yellow green. The males have a light-blue spot on their bellies, which is not a trait the females share. Darner dragonflies can usually be seen flying around bodies of water such as lakes or ponds."
Anax is the Ancient Greek word for King. Junius was the Roman term for the month of June. Anax Junius, can therefore be interpreted as the King of June. It is also notable that this dragonfly first appears in June.
Names in other languages