Pink-Banded Sister
Adelpha lycorias lara
The Pink-Banded Sister doesn't need much colour to make an impression. Most of the upper wings are deep brown, which leaves a broad reddish pink band across the forewings doing nearly all the work. From above, the pattern seems relatively simple. Turn the butterfly over and that simplicity disappears.
Cream, brown and paler markings break across the underside in a much more intricate arrangement, while the strong band visible above becomes softer. It's almost as though two different approaches to pattern have been fitted to the same wings.
Adelpha lycorias lara is a South American subspecies of Adelpha lycorias, found along the tropical Andes. It's one of the “sisters”, a group of butterflies whose family resemblance can make identification considerably less straightforward than their individual common names suggest.
Classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Nymphalidae
Subfamily: Limenitidinae
Genus: Adelpha
Species: Adelpha lycorias
Subspecies: Adelpha lycorias lara
Common Name: Pink-Banded Sister (species)
Distribution: Northern and central tropical Andes of South America
A Little Pink Goes a Long Way
Viewed dorsally, A. lycorias lara is dominated by dark brown. Smaller pale markings interrupt the wings, but attention tends to land on the reddish pink band crossing the forewings.
That band isn't identical on every specimen. Its width and outline vary, while lighting and specimen condition can shift its apparent colour from a softer pink red towards something closer to crimson.
The underside is another matter. Dark areas give way to a busier combination of cream and brown, with smaller lines and patches becoming much easier to see. The forewing band remains, although considerably paler than it appears above.
For a butterfly of fairly modest size, there's an awful lot packed into the pattern. Most of it becomes apparent only after getting close.
Why Are They Called Sisters?
“Sister” is used for numerous butterflies within Adelpha. The usual explanation traces the name to the contrasting dark and pale markings of some species, which were compared with the black and white clothing traditionally worn by nuns.
The name stuck. There are now Banded Sisters, Arizona Sisters and several others scattered through the genus.
Pink-Banded Sister generally refers to Adelpha lycorias rather than uniquely to the subspecies lara. That distinction matters when a specimen is being labelled more precisely. The common name gets us to the butterfly people recognise. Adelpha lycorias lara tells us which taxon we're actually looking at.
Identification within Adelpha can be fiddly. Several species share broadly similar arrangements of dark wings, pale bands and coloured markings, so the exact position and shape of those markings can matter far more than the overall impression.
Sometimes “brown butterfly with a stripe” really isn't enough to go on.
Following the Andes
The lara subspecies occurs along the tropical Andes of South America, with records extending through northern and central portions of the mountain chain.
Calling this simply a mountain butterfly hides quite a lot of variation. Andean landscapes can change rapidly with elevation and geography. Temperature, rainfall and vegetation shift over surprisingly short distances, producing a patchwork of forest environments rather than one continuous habitat repeated from north to south.
Adelpha butterflies may be encountered around forest tracks, openings and edges as well as within more heavily vegetated areas. These broken spaces create patches of light and feeding opportunities while keeping forest close by.
For a preserved specimen, locality information is consequently worth keeping. A place name tells us something that the wing pattern can't.
No Caterpillar Stays a Caterpillar
Like other butterflies, the Pink-Banded Sister undergoes complete metamorphosis. An egg hatches into a caterpillar, the caterpillar grows through successive moults and eventually forms a pupa. What emerges from that pupa has been extensively reorganised into the adult butterfly.
Host plant records for Adelpha lycorias include members of Urticaceae, the nettle family, with Cecropia and Ureraamong the genera reported for the wider species.
The qualification matters. A host recorded for A. lycorias somewhere within its range isn't automatically a confirmed host for the subspecies lara everywhere it occurs. Insects have an unfortunate habit of making tidy distribution lists look more certain than the underlying records actually are.
Adults aren't necessarily waiting around flowers either. Like many tropical nymphalids, Adelpha butterflies may investigate other sources of sugars and minerals, including fallen fruit and tree sap.
Standing on Four Legs, Technically Six
Pink-Banded Sisters belong to Nymphalidae, the enormous butterfly family containing monarchs, admirals, fritillaries and plenty of butterflies that don't look particularly related at first glance.
There's a small family feature hiding near the head.
Nymphalids have a reduced first pair of legs. These shortened forelegs aren't normally used for walking in the same way as the remaining pairs, so a resting butterfly can appear to be standing on only four legs despite having the six expected of an insect.
Hence the family nickname, brush-footed butterflies.
Within Nymphalidae, Adelpha belongs to Limenitidinae, placing the sisters among the broader group containing admirals and their relatives. Once that relationship is known, some of the similarities in their strongly banded wings become easier to notice.
When the Label Gets Old Before the Butterfly
Adelpha lycorias lara hasn't spent its entire scientific history under exactly that combination of names. Like many insects first described during the 19th century, it has moved through different taxonomic arrangements as relationships within the group have been reconsidered.
That can make an old specimen label unexpectedly interesting.
A historical genus or a taxon once treated at a different rank isn't necessarily evidence that somebody identified the butterfly incorrectly. The label may simply preserve the classification being used at the time.
Taxonomy can move around a preserved specimen while the butterfly itself remains exactly where somebody pinned it.
Two Sides Worth Seeing
Butterfly colour is carried across thousands of tiny overlapping wing scales. On A. lycorias lara, those scales build the dark fields, pale markings and pink band that appear so clean from ordinary viewing distance.
They're also remarkably easy to lose. Rubbing or unnecessary contact can detach scales and leave visible patches behind, making minimal handling important during preparation and afterwards.
A preserved specimen does offer something that's much harder to manage with a butterfly in flight. It stays still.
The edges of individual markings, wing veins and smaller patches can be examined closely, but the real surprise comes from comparing the two surfaces. Dorsally, brown and pink dominate. Ventrally, the same wings become paler and considerably more complicated.
Neither side really gives the whole butterfly away.
In the Apotheca
Adelpha lycorias lara makes a particularly good argument for seeing both sides of a specimen.
A dorsal mount catches the feature that earned the species its common name. The pink band cuts sharply through the darker wings and can be understood almost immediately. Turn to the ventral surface and the butterfly asks for a second look. Fine markings appear, the colours soften and a pattern that seemed simple becomes much harder to summarise.
Put dorsal and ventral specimens together and the comparison does more than show two attractive surfaces. It reveals how much information a butterfly can carry on wings only a few centimetres across.
The pink gets your attention.
The other side rewards it.
Leave a comment