I came across this very large (c. 5 cm in length) digger wasp which was searching the leaf litter in Doi Suthep-Pui National Park, northern Thailand. It is a scoliid wasp called Megascolia azurea (Subfamily Scoliinae; Tribe Scoliini).  There are five subspecies. (1) Given the location, perhaps it is ssp. siamensis  Bertem). Regiscolia  is an alternative name for this genus,…