This butterfly of the far south of France is quite uncommon and could easily be confused with the Lesser Marbled Fritillary (B. ino) based on the upperside alone. The male hecate is a clear bright orange and the female more heavily suffused grey, dulling the orange. Hecate has series of quite round post-discal spots on both upperside wings, as well as a series of submarginal spots which are shown in T&L as being essentially round on the uph, and a continuous black margin. Ino is very similar and is usually depicted as having a series of somewhat indistinct non-round submarginal marks. This originally had me fooled, as the submarginal marks of 1480 look non-round and more like ino than hecate according to T&L.

Buthecate has a complete series of post-discal spots on both the upf and uph of similar size, and ino has no (or very small) spot in the upf s4 and a significantly smaller spot in the uph s4 (see illustrations below). Curiously I can't seem to find any mention of this in the books. The underside is quite distinctive, though. The two series of unh black spots are characteristic of hecate and give it its name.

The flight period is from the end of May to mid-June, so unless you are visiting possible sites at this time, you are unlikely to see it. I originally saw one hecate in 2000 at this time, and it was not until 2006 that I started to visit Var regularly in May, since when I have seen it at three sites in Var and in 2011 I found it at three more sites in the west of the Alpes-Maritimes where this species has a stronghold. One of these sites was at an altitude of 1400m, which is about the upper limit of the altitude range for this species.

The larval hostplant is Filipendula vulgaris (English nameDropwort), a white-flowered plant of about one metre height. It is not uncommon in the region, and I have found that wherever Filipendula grows, there is often hecate to be found there.

observations

a male. Hard to get a good photo as the males seemed to be continuously on the move.

a quick snap on the move of the hyperactive male hecate. Another hecate is approaching from the right.

this is the female from the mating pair in 10833. The weather was dull and the pair remained as in 10833 for some time, but then the sun came out briefly and the female opened up, still connected to the male although this is not obvious and needs a close look at the photo to confirm that the foreground obstruction is, in fact, the male.

the mating pair, female on the right, posing nicely in dull weather. The foothold of the male seems tenuous to say the least.

a male underside of one that did stop for a moment.

difficult to say whether this is a male or female, as the series of unh post-discal black spots is rather midway between the heavy spots of the female and the lighter spots of the male.