Beetles

Type	Enemy
Environment	Underground Jungle
AI Type	Fighter AI
Damage	20/40›72/60›108
Max Life	40/80›176/120›264
Defense	10/10›20
KB Resist	0%/10%/20%
Banner	Lac Beetle Banner(Desktop, Console and Mobile versions)
Immune to
Coins	60 CCPre-Hardmode: 1 SC50 CCHardmode: 2 SC40 CC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_16.wav

Type	Enemy
Environment	Ice biome
AI Type	Fighter AI
Damage	20/40›72/60›108
Max Life	40/80›176/120›264
Defense	10/10›20
KB Resist	0%/10%/20%
Banner	Cyan Beetle Banner(Desktop, Console and Mobile versions)
Immune to
Coins	60 CCPre-Hardmode: 1 SC50 CCHardmode: 2 SC40 CC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_16.wav

Type	Enemy
Environment	Cavern
AI Type	Fighter AI
Damage	20/40›72/60›108
Max Life	40/80›176/120›264
Defense	10/10›20
KB Resist	0%/10%/20%
Banner	Cochineal Beetle Banner(Desktop, Console and Mobile versions)
Immune to
Coins	60 CCPre-Hardmode: 1 SC50 CCHardmode: 2 SC40 CC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_16.wav

Beetles are rare enemies that can be found in different biomes.

There are three types of beetle: The Cochineal Beetle that spawns in the Cavern layer, the Cyan Beetle that spawns in the Ice biome and the Lac Beetle that spawns in the Underground Jungle biome. They respectively drop the Red Husk, the Cyan Husk and the Violet Husk which can be used to respectively make the Red Dye, the Cyan Dye, and Violet Dye.

They are all immune to the Confused debuff.

Types

Despite their primary purpose being to provide dye crafting material, these can do substantial damage, especially to players who mistake them for passive Critters.
The Cyan Beetle spawns rarely and can be hard to spot due to its small size and blue color which blends well with the Snow Biome. Use of Water Candles, Battle Potions and Hunter Potions is recommended when trying to hunt it for the Cyan Dye.
The Cyan Beetle seems to be more rare in the Old-gen console version.

The Cochineal Beetle and the Lac Beetle exists in real life, but they are a scale insect, not a beetle. It secretes lac, which can be used as dye or converted into shellac, a brush-on colorant, food glaze and wood finish.