This big wasp was a little unhappy about the photo session - and engaged in some interspecies communication. Fortunately it was bluffing, and I didn't get stung.
黃柄壁泥蜂 Sceliphron madraspatanum
A Photographic Guide to Hong Kong Insects 香港昆蟲圖典 1st Edition 2014 P.711 - Hong Kong Entomological Society
found near 豊平川 river.
provisioning nest with unknown caterpillar
Thread-waisted wasp with half of the abdomen reddish-orange. Seen on wooly butterfly bush, Buddleja marrubiifolia. Note the silver streaks on the thorax that I believe indicate A. procera.
The Sphecidae (Latreille, 1802) are a cosmopolitan family of wasps that include digger wasps, mud daubers, and other familiar types that all fall under the category of thread-waisted wasps. Both of the traditional definitions of the Sphecidae (the conservative one, where all the sphecoid wasps other than ampulicids and heterogynaids were in a single large family, and the more refined one, where the seven large sphecid subfamilies were each elevated to family rank) have recently been...