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Most of the important bits of Saether's key to the North European species were posted a while back in this thread. The figures of the penis valves are included in Volume 6, Part 2 of Key to the Insects of Russian Far East, which is available online.

The colour characters used in the old keys, such as those of Edwards and Freeman, may be unreliable. Having said that, I still think Janet's pictures are most likely crystallinus. The tergites are uniformly dark and the femora are not obviously darker at the apex.