Baltimore Checkerspot Identification Guide
A boldly checkered black, orange, and white butterfly of wetland meadows named for the colors of Lord Baltimore's coat of arms.
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Key Features
The Baltimore checkerspot (Euphydryas phaeton) is a medium-large butterfly with a wingspan of about 1.75 to 2.75 inches. Its identification features are quite bold:
- Wings are predominantly black, overlaid with a mosaic-like checkered pattern of orange-red spots and cream to white spots arranged in neat rows.
- A row of bright orange-red spots runs along the outer margin of both wings, framing the black-and-white checkered interior pattern.
- The underside shows a similar but even brighter checkered pattern, with more extensive orange and cream-white coloring, making the closed-wing view nearly as striking as the open-wing view.
- Wings are rounded, and the body is dark with fine hairs.
- Flight is relatively slow and low compared to many other butterflies, making it easier to observe closely.
Where and When to Spot It
This species is closely tied to wet habitats, particularly wet meadows, bogs, and marshy areas where turtlehead, its primary caterpillar host plant, grows. It is found across the northeastern United States, the upper Midwest, and adjacent parts of eastern Canada. Baltimore checkerspots fly in a single generation each year, typically from June into July, and populations are often somewhat local or colonial, meaning they can be common in a specific wet meadow but absent from seemingly similar habitat nearby.
Similar Species
- Silvery checkerspot: Smaller, with an overall more orange appearance and silvery spots visible on the underside, differing from the Baltimore checkerspot's heavier black-and-white checkering.
- Other fritillaries: Generally more uniformly orange without the bold black-and-cream checkered mosaic pattern.
- Pearl crescent: Much smaller and more finely patterned, lacking the bold black base color and large cream-white spots.
Quick ID Checklist
- Medium-large black butterfly with a bold checkered mosaic pattern
- Rows of orange-red and cream-white spots across both wings
- Bright, similarly checkered underside pattern
- Found in wet meadows, bogs, and marshes near turtlehead
- Single flight period, typically June through July
FAQs
Frequently asked questions
Why is this butterfly called the Baltimore checkerspot?
Its black, orange, and white coloring is said to resemble the colors found on the coat of arms of Lord Baltimore, giving the species its common name.
What kind of habitat is best for finding this butterfly?
Wet meadows, bogs, and marshy areas with turtlehead plants are the most reliable habitats, since turtlehead serves as the primary caterpillar host plant.
How many generations does the Baltimore checkerspot have per year?
It typically has a single generation each year, with adults flying from June into July depending on location.
How can I tell a Baltimore checkerspot from a silvery checkerspot?
The Baltimore checkerspot has heavier black coloring with bold cream-white and orange checkering, while the silvery checkerspot looks more overall orange with silvery underside spots.