The apterae of Aphis armata are black. Immatures often have discrete wax spots, but apterae rarely have such spots. The middle abdominal tergites in apterae are usually without dark sclerotic bands. The only reliable characteristic to differentiate the species from Aphis fabae is that the oviparae have hardly any swelling of the hind tibiae, whilst in Aphis fabae the oviparae have the hind tibiae strongly swollen. The body length of apterae is 2.2 to 2.9 mm.

The foxglove aphid does not host alternate. It only feeds on Foxglove.

Summer and autumn. In Britain, large populations of Aphis armata can often be found on Foxgloves from mid May.

Sexual forms occur in autumn.

Widespread but little recorded in Britain.

Status in Leicestershire and Rutland not known.

https://influentialpoints.com/Gallery/Aphis_armata_foxglove_aphid.htm