Howard County Bird Club
Giant Swallowtail
Place name abbreviations: MPEA – Middle Patuxent Environment Area; PRSP – Patuxent River State Park; PVSP – Patapsco River Valley State Park.
Click on the common name to obtain additional information from the Butterflies and Moths of North America web page. BugGuide is another web resource.
Legend:
| Common name [Link is to BAMONA] (wingspan range in inches) | Occurrence level & flight period. | |
| Habitat. | Typically visits (for nectaring). | Larval host plants. |
| Giant Swallowtail (4–6.2″) | Rare: May thru Aug | Open, weedy fields | Swamp milkweed, Japanese Honeysuckele, goldenrod | Common Rue | |
August 14, 2012
Ellicott City
Kathy Litzinger
August 14, 2012
Ellicott City
Kathy Litzinger
August 14, 2012
Ellicott City
Kathy Litzinger
September 3, 2012
Columbia
John KcKitterick
September 3, 2012
Columbia
John KcKitterick
The phenograms show the maximum number of individual butterflies of this species seen in the first eight years of the Howard County Butterfly Survey. From these graphs, one can see the number of broods of each species, when they are active, and the relative abundance of the species in each brood. The observed early and late dates are shown below The graphs can be used to anticipate the first sighting of a given species in the year and can help with identification.
Early: 8/27/2014 Late: 10/2/2019