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Black wings with big translucent green windows, a wingspan of about 4 inches, and a habit of staying far above the ground: that is the scarce bamboo page, Philaethria dido. Butterflies and Moths of North America (BAMONA) lists the range as Brazil north to Mexico and the habitat as tropical rain forest. The Texas link is thin but real. The same entry calls it a rare stray to the lower Rio Grande Valley of South Texas, and that single line is why it appears among the butterflies of the state at all.
How to recognize the scarce bamboo page
BAMONA describes the upperside of both wings as black with large patches of translucent green. The underside is similar, with gray overscales on the brown areas. Wikipedia puts the wingspan at about 110 mm, roughly 4.3 inches, and the Florida Museum of Natural History gives 3.9 to 4.3 inches, so this is a big butterfly.
Green and black is not unique to it. Wikipedia notes that the species is often confused with the malachite, Siproeta stelenes. The color scheme is alike, but the wing shapes differ, and the habits differ too: the scarce bamboo page flies high in the canopy, while the malachite is often seen in forest clearings and open secondary forest. Anyone checking a Texas photograph should look at wing outline and the height at which the butterfly was flying before settling on a name. The other common names, dido longwing and green longwing, are the same animal.
Where it lives and where Texas fits
The core range runs through Central America and tropical South America, east and west of the Andes, from Brazil and Ecuador north to Mexico, according to Wikipedia. It lives in tropical rain forest from sea level up to about 1,200 meters and is absent from deciduous forests. Three subspecies are recognized, and the Butterflies of America catalog lists them: the nominate form, chocoensis from Colombia and panamensis from Panama. In Mexico the flight period given by BAMONA is July to December.
Texas sits at the far edge of that picture. The lower Rio Grande Valley is the northern edge of what a tropical butterfly could reach, and the species list calls its presence there a rare stray. BAMONA’s verified-sighting list for the species held only four entries when checked on 6 October 2026. Wikipedia says strays have occasionally been observed in the lower valley. Neither source gives dates or sites for the Texas records, so this page does not either.
Life history: passion-vines and a quiet life in the canopy
Females lay eggs singly on the underside of older leaves, and the caterpillars eat those leaves. BAMONA names the host plants as various passion-vines, including Passiflora laurifolia, P. vitifolia, P. edulis and P. ambigua. Wikipedia, citing an account of the Amazon and Andes populations, adds that the caterpillars are light green with a covering of reddish spines, and that the chrysalis is brown blotched with gray, warty, and resembles a bird dropping.
Adults feed on nectar. BAMONA lists Cordia curassavica and Cissus among the flowers used. Males normally fly high in the canopy but sometimes come down to sunlit stream sides or gravel beaches to sip mineral-rich water; females often fly at about 4 meters, dipping down to inspect passion-flower plants where they might lay eggs. Flight is described as fast and direct.
Status in the United States
BAMONA’s conservation line reads “not necessary for rare stray,” and its management line reports no needs. For a species whose real population lives in Latin American forest, that is the logical position: there is no US population to protect.
What a Texas gardener can and cannot do
None of the sources reviewed describes a planting that attracts this butterfly, and it would be misleading to invent one. The host plants are passion-vines, and the butterfly garden guide covers passionflower in the context of the zebra longwing in Florida, a different species with a US-resident population. Passion-vines in a South Texas yard may feed other butterflies. Whether they ever draw a stray Philaethria dido is not documented.
The realistic action is observation. Strays are rare and photographed, and a clear photograph showing the wing shape and the green windows is what turns a possible sighting into a record that BAMONA or a regional checklist can verify. For butterflies with resident US populations that are worth looking for, see the Persius duskywing and the mountain-dwelling rockslide checkerspot.
The odd part is the geography: a butterfly of the rain-forest canopy occasionally shows up in a river valley with no rain forest at all.
Common questions
What is the scarce bamboo page butterfly?
It is Philaethria dido, a large brush-footed butterfly (family Nymphalidae) of tropical American forests. Other common names are dido longwing and green longwing. The upper side of both wings is black with large translucent green patches, and the underside looks much the same, with gray overscaling on the brown areas, according to Butterflies and Moths of North America.
Does the scarce bamboo page live in Texas?
Not as a resident. Butterflies and Moths of North America gives the range as Brazil north to Mexico, with a rare stray to the lower Rio Grande Valley of South Texas. Wikipedia repeats that strays are sometimes found there. A sighting in Texas is a notable record, not a normal garden visitor.
What do the caterpillars eat?
Passion-vines. The species list names Passiflora laurifolia, P. vitifolia, P. edulis and P. ambigua. Females lay eggs singly on the underside of older leaves, and the caterpillars eat those leaves. The caterpillars are light green with reddish spines, and the chrysalis looks like a bird dropping.
How big is it?
Wikipedia gives a wingspan of about 110 mm, or 4.3 inches. The Florida Museum of Natural History lists 3.9 to 4.3 inches. That makes it larger than most butterflies a Texas gardener sees, though wing shape and the green patches matter more than size for telling it from lookalikes.
What can it be confused with?
Wikipedia names the malachite, Siproeta stelenes, as the usual lookalike. Both are green and black, but the wing shapes differ, and the scarce bamboo page flies high in the canopy while the malachite is often seen in forest clearings and open secondary forest.
Can I plant a garden to attract it?
The sources reviewed here do not describe any planting that draws it. It is a canopy butterfly of tropical rain forest, and its US records are strays. Passion-vines are its caterpillar plants and Cordia curassavica and Cissus are listed as nectar sources, but no source ties a Texas yard planting to a visit by this species.