[3] The adult females inject their eggs into the stems of food plants, and, when the larvae emerge, they burrow underground and as nymphs feeding on root sap.

It has transparent wings with prominent veins, folded over the back when at rest, and a dark slate-grey or black body with dull orange rings around the abdomen.

The call of C montana sounds like static hiss to the unaided human ear and is sustained with relatively short lulls at irregular intervals.

In 2013, in an attempt to locate remaining specimens, developers have written application software for smartphones, enabling users to listen to sound frequencies beyond the normal human range.

The project will involve capturing individuals from the Idrija region of Slovenia, with some to be captive bred and others released into a series of carefully monitored locations.