False Grayling (Arethusana arethusa)

next page           back to list

2016 photographs highlighted in green. Click on any photograph to go to an enlarged picture, or simply scroll down the page.

8772_male_Var_2Aug07 31470_male_Var_28Aug12 3561_female_Var_10Aug06
31496_male_Var_28Aug12 8712_male?_Var_2Aug07 13606_male_Lozère_20Aug08
13804_male_Vaucluse_23Aug08 27930_male?_Var_30Aug11 42064_male?_Var_22Aug16
   
13858_female_Vaucluse_23Aug08    

Prior to 2006, I had seen a few arethusa in various places in the south of France, never in great numbers, and it was always a pleasure to see them. It is a very appealing and intricately marked butterfly, especially when fresh. In 2006 I stayed in Var throughout August and September and found that there was a strong emergence in mid-August extending through until mid-September when I counted at least 20 in one locality alone. It is a semi-altitude specialist and most of these were seen at 800-1000m although I have seen them at 2000m whereas the books indicate that its altitude range is normally up to 1100m and exceptionally 1600m. In subsequent years in this same locality, there has been a mass emergence at the beginning of August and they could be counted in hundreds, staying on the wing until mid-September.

 

When it settles, it immediately opens its wings briefly a couple of times, maybe to scare off predators, and then closes them without re-opening them again. However, once you realise that this always happens, you can get an upperside shot it you're quick. Not great shots but they do show the difference between the sexes from the upperside, as the undersides appear very similar.

The subspecies dentata has a more tooth-shaped (dentate) pattern to the unh post-discal area, also reflected in the rather tooth-shaped upperside orange markings, and a lesser degree of contrast across the unh discal line. Dentata is said (in T&L) to be the normal subspecies in southern France, the nominate form occurring in the north, although I believe that at least some of these photographs are of the nominate form, not dentata. Higgins & Riley, a very authoritative work if now 45 years since publication, says that dentata is found in south-west France and is "transitional to" arethusa in the Basses Alpes and this would seem to explain the similarity as the Var locations were in the north of the département on the edge of the Basses Alpes.

ref sex

observations

alt. m
8772 M

a male, very fresh with a nice rich dark brown ground colour, and a rich orange post-discal band on both wings. The extent of the orange is much less than shown in T&L. The rather tooth-shaped external edges of the orange markings, the uph in particular, suggests that this may be the subspecies dentata.

920
31470 M a male, holding its wings open in rather overcast weather. The orange band is quite wide, much more so than 8772, but I feel that it is a male. 1020
3561 F

a female upperside, a quick flash before closing up. There is a small upf black spot in s2, and a strong uph black spot in s2. This appears to be of the nominate species, not dentata.

780
31496 M a nicely marked male, which appears to not be of the form dentata. 1020
8712 M

probably a male, as I believe the undersides of both sexes are almost indistinguishable. In fact, T&L only gives one underside illustration. This seems fairly typical of the mass emergence of arethusa.

920
13606 M

a male, I think, with rather dull colouring, even though fresh.

1100
13804 M

a fresh male, nice orange but not the fiery colouring that arethusa sometimes has.

750
27930 M a male perhaps, quite a pale orange unf and a rather grey unh post-discal band. 920
42064 M? yet another variant on the underside of arethusa. This individual has a very white post-discal band, providing strong contrast with the adjacent areas. 680
13858 F

a nice fresh female, bright orange and a strong discal line. I am assuming it is a female as it was lurking in the undergrowth.

750

 

8772_male_Var_2Aug07

 

31470_male_Var_28Aug12

 

3561_female_Var_10Aug06

 

31496_male_Var_28Aug12

 

8712_sex?_Var_2Aug07

 

13606_male_Lozère_20Aug08

 

13804_male_Vaucluse_23Aug08

 

27930_male?_Var_30Aug11

 

42064_male?_Var_22Aug16

 

13858_female_Vaucluse_23Aug08