Some years ago, I postulated my belief that the Juniper Shieldbug was probably far more widespread than the records in Southwood & Leston indicated. I.e., no further north that Witherslack in South Cumbria.
I had great success in finding this species in Northumberland and Co.Durham, and, in a note to the Entomologists Gazette, I suggested that entomologists interested in the Hemiptera should look for it on stands of Juniper elsewhere in Northern England and in Scotland.
Less than a year later I was advised that a Cumbrian Entomologist had taken up my suggestion and had indeed found this insect wherever he had looked for it, amongst stands of indigenous Juniper. I did suggest that Scottish Entomologists should also look for this species, as I had a feeling it should occur on natural wild Juniper. After some years no Scottish Entomologist had taken up my challenge, so I went and looked for it myself. The very first stand of Juniper I examined in the Lammermuir Hills ( south of Edinburgh)produced this species. I wrote an additional note in the Entomological Literature and a naturalist in Scotland decided to look at Juniper in the northern areas of that country. I was not at all surprised when he reported finding this Shieldbug in some profusion. Again, on natural stands of Juniper.
It would appear that this, and possibly other species of Shieldbug,
may occur well beyond their known range, simply because they haven't been looked for in the past.
Harry