Weaver's Fritillary (Boloria dia)
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2020 photographs highlighted in green. Click on any photograph to go to an enlarged picture, or simply scroll down the page.
A relatively small fritillary, the upperside being superficially similar to the Pearl-bordered Fritillary (B. euphrosyne) and the Titania's Fritillary (B. titania) although easily distinguishable by the sharply-angled hindwing, more readily apparent from the underside shots, but as it quite often rests with wings wide open this can often be seen from the upperside (see 25497). Titania also has an angled hindwing, but to a lesser extent than dia, and titania is an altitude species, so any specimens at low altitudes are bound to be dia. The undersides of dia and titania are quite similar but can easily de differentiated on close examination.
The uppersides of dia and euphrosyne are quite similar but the dia wing shape is usually definitive.
It seems to be reasonably widespread throughout southern France as I have seen at least one at most places I have visited, and it was only in September 2006 that I found a location at 765m altitude in northern Var where it was common, and in this location each September it has been very common indeed. It seems to vary in size, often producing very small individuals, sometimes with very narrow wings. It is also (and perhaps more widely) known as the Violet Fritillary.
|7440||M||a male, based on body shape (not 100% certain, though) and some subtleties of the black markings. Other subsequent photographs on this page of males do, in fact, suggest that this is a female.||1080|
|25497||M||a male, based on body length, and more heavily marked which is possibly an altitude effect.||1320|
|35463||M||a male, with rather narrow wings (top to bottom) but rather wide across. It may be a second brood, as dia may be triple brooded in southern Var, the first brood appearing in April.||220|
|36730||M||a male of the (probable) third brood.||220|
|36761||F||a female of the third brood, with a rather suffused appearance. 36751 is the underside.||220|
|27884||F||a female, quite dark and heavily suffused, but the low altitude indicates that this is not an altitude effect.||320|
|42479||F||a female, quite heavily marked, especially in the marginal region of the uph. 42463 is the underside. It was photographed in overcast conditions, and dia sits with open wings which tend to curve downward at the edges making it difficult to get them into focus, given the limited depth of field of macro lenses.||220|
|42463||F||a female, the underside of 42479. It is a beautifully cleanly marked underside, with strong violet (hence the alternative name) marbling effect.||220|
a quite light and subtly-marked underside. It shows up the beautiful red-brown markings to good effect. I'm not sure why I originally thought this was a female, but a female upperside was photographed within 60 seconds, and so they may well be the same butterfly.
|36751||F||known to be a female from a view of the upperside (36761 is the upperside). The delicate violet marbling shows why its alternative name is perhaps more appropriate.||220|
a fairly typical dia underside, midway between 5789 and 8613 in terms of strength of markings.
a very darkly-marked underside. The angularity of the hindwing is visible, and this is a clear pointer to dia. I am not sure whether it is male or female, possibly male based on the slightly territorial-looking pose.