Cleon
Legend
all those ( Proficiency in DEX, CON saves and Perception skill plus blindsight 10 ft., darkvision 60 ft. senses.) sound fine. Could question how a diurnal dragonfly has darkvision but not fussed really
Well they're fantastical draconic-insectile monsters not overly embiggened arthropods so I'm not fussed about them being diurnal.
While their 2E AD&D were had Day as their activity cycle, their BECMI incarnation made no mention of when they are active, plus their first published appearance in XL1 - Quest for the Heartstone (1984) had the Mystaran Dragonflies living in a dungeon's cave.
No daylight for them underground!
I guess we could create an Underdark Variant like we did the regular Giant Dragonflies, but I'd rather give them all darkvision and blindsight like a Wyrmling.