On Menorca, the Hyles dahlii population consists of a hybrid with Hyles euphorbiae. Due to this hybridisation, only few characteristics of Hyles dahlii are present in the imago. There is also hybridisation on Malta. Here it is a hybrid between Hyles dahlii and Hyles tithymali. Research suggests that Hyles dahlii is in fact a species which evolved from Hyles tithymali through isolation.
The wingspan is 65–85 mm.
Adults are on wing from May to June and from August to September in two generations. The larvae feed on various herbaceous plants, including Euphorbia paralias, Euphorbia myrsinites, Euphorbia characias, Euphorbia dendroides, Euphorbia pithyusa, Euphorbia pinea and Euphorbia terracina.
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- Hyles dahlii, European Butterflies and Moths
- Hyles dahlii, Moths and Butterflies of Europe and North Africa
- Hyles dahlii, Fauna Europaea
- Hyles dahlii, Lepiforum.de
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