A shield bug in the monsoon forests of the eastern Himalaya
In early August, the forests of Medog in Tibet were deep in monsoon season, dripping with water and humming with insects. This shield bug was sitting out in the open, its body flattened like a well-made shield, and it stayed perfectly still as the rain misted around it.
This is Rolstoniellus malacanicus, a member of the stink bug family Pentatomidae in the order Hemiptera. Pentatomids are sap-feeding true bugs named for the defensive scent glands on their thorax, which release a strong odor when the bug is disturbed; handled roughly, they make the point unmistakably, and I chose not to test this one. Most are plant feeders, and their shield-shaped bodies make them some of the easiest bugs to recognize, the enlarged pronotum and scutellum protecting the wing bases and glands underneath.
The species name malacanicus points to Malacca, a region of Southeast Asia, and Medog sits at the far eastern end of the Himalaya where the faunas of India, Southeast Asia, and Tibet meet. That overlap makes this one of the richest corners of China for true bugs, and a walk in the monsoon forest can turn up species that look like they belong a thousand kilometers further south.
I left it where it sat, quietly dripping. Some insects bolt the moment they sense you; this one seemed to have decided that the monsoon, not me, was the thing worth paying attention to. I took that as a compliment and moved on, leaving the shield bug to its rain.
