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Phenology of Hy. albidus (35 collections) and Hy. fraxineus (55 collections) within Europe, based mainly on data in Tables 1 and 2. Indicated is the number of collections for each species.
| May 1 | May 2 | June 1 | June 2 | July 1 | July 2 | Aug. 1 | Aug. 2 | Sept. 1 | Sept. 2 | Oct. 1 | Oct. 2 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hy. albidus | – | – | – | 2 | 4 | 8 | 7 | 5 | 7 | 3 | – | – |
| Hy. fraxineus | – | 3 | 2 | 10 | 15 | 15 | 6 | 7 | 7 | 2 | – | – |
