Euchloe insularis (Staudinger, 1861)

Host plants:
The caterpillar lives on flowers and fruits of Brassicaceae species such as Sinapis, Erucastrum, Iberis, Hirschfeldia, Sisymbrium, Isatis.

Habitat:
Euchloe insularis inhabits open and semi-open habitats from the coast to about 1400m above sea level. In Sardinia, I found the caterpillar in all instars and especially fresh adults (mostly probably already the second generation) in the second half of May, especially near the coast for example in dunes or at field margins with Sinapis. In the inland, the butterflies were found less frequently at this time (perhaps mainly the caterpillar stage?).

Life cycle:
The pupa hibernates. The adults fly from March to June in two partially overlapping generations, the second of which is usually only partially. The eggs are usually deposited in the developing inflorescence as is also the case with Euchloe ausonia. The mature caterpillars are coloured differently, however, and somewhat reminiscent of those of Euchloe tagis.

Endangerment factors:
Euchloe insularis should not currently be at greater risk.

Remarks:
Euchloe insularis is endemic to Corsica and Sardinia.