Gulf fritillary vs Julia butterfly

These two are easy to mix up. Here's how to tell a Gulf fritillary from a Julia butterfly, and whether either one bites or stings.

Gulf fritillary (Dione vanillae) — no rights reserved

Julia butterfly (Dryas iulia) — (c) Cheongweei Gan, some rights reserved (CC BY)

≠The key differences

Gulf fritillary shows prominent silver spots on the underside of the hindwing and has more heavy dark markings on the upper surface; Julia lacks the silver underside spots and is more uniformly orange.

⚖︎Side by side

	Gulf fritillary	Julia butterfly
To humans	Non-toxic	Non-toxic
Size	6-9 cm wingspan	Wingspan about 80-90 mm
Colours	Bright orange, Black, Silvery white, Brown	Bright orange, Reddish orange, Pale orange-brown (underside), Dark brown (small markings)
Family	Nymphalidae	Nymphalidae
Habitat	Open, sunny habitats: gardens, fields, roadsides, edges of woodlands and places where passionflower vines grow.	Open, sunny habitats: edges of woodlands, gardens, hedgerows, roadsides, disturbed areas, and places where host passion vines grow.
Range	Southern United States (e.g. Florida, the Gulf Coast, Texas, Arizona and California), through Mexico, the Caribbean and Central America, into much of South America; strays farther north in summer.	Neotropics from South America through Central America and the Caribbean; reaches southern United States (Florida and southern Texas) where it may breed or appear seasonally.
Active	Year-round in tropical regions; spring to fall and in warm months in temperate regions; most active during daylight, especially sunny periods.	Year-round in tropical regions; spring to autumn in temperate parts. Diurnal—active in daylight, especially mid-morning to afternoon.
Pest?	Yes	No

🔍How to spot a Gulf fritillary

Bright orange upperside with black spots and streaks; fairly plain compared with some fritillaries.
Hindwing underside with distinctive silvery-white, reflective spots.
Caterpillars are bright orange/red with many black spines (tubercles) on each segment.
Wingspan about 6-9 cm and a rapid, direct flight pattern.

Full Gulf fritillary guide →

🔍How to spot a Julia butterfly

Uniform bright orange upperwings with elongated, narrow forewings and a pointed forewing tip.
Lack of heavy dark bands or extensive eyespots on the upper surface (unlike many fritillaries).
Long, narrow wing shape and swift, direct flight.
Underside paler orange to brownish, without striking silver spots.

Full Julia butterfly guide →

?Frequently asked questions

What is the difference between a Gulf fritillary and a Julia butterfly?

Is a Gulf fritillary or a Julia butterfly more dangerous?

Gulf fritillary: Non-toxic. Julia butterfly: Non-toxic. Adults and caterpillars are not venomous or poisonous to people. Julia butterflies are harmless to people.

Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.