Asterocampa leilia

Distinguished from similar Asterocampa species by its brownish-orange coloration and specific spot pattern on the ventral wing surfaces. The Empress Leilia can be separated from the Tawny Emperor (Asterocampa clyton) and Hackberry Emperor (Asterocampa celtis) by geographic range and subtle differences in wing pattern and coloration. In the southwestern U.S., it is the primary Asterocampa species in desert habitats.

Adults are brownish-orange in coloration. The ventral wing surfaces display distinctive white and black spots. Wingspan ranges from 1.5 to 2 inches (38–51 mm). The overall coloration provides camouflage when wings are closed, with the spotted pattern visible on the underside.

Occurs in desert environments including canyons, streamsides, thorn scrub, and washes. Strongly associated with hackberry (Celtis) host plants, which serve as larval food sources and as perching sites for mate-locating males. Requires access to moisture sources such as stream margins for adult puddling behavior.

Southwestern United States (Arizona, Texas) and Mexico. The species occupies arid and semi-arid regions within this range.

Adults feed primarily on non-floral liquid sources including dung, sap, and rotten fruit. Nectar feeding occurs only rarely. Larvae feed exclusively on hackberry (Celtis spp.) foliage.

• Celtis - larval host plantHackberry species; serves as food for larvae and perching sites for males

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae feed on hackberry leaves. Specific details of pupation site and overwintering stage not documented in available sources.

Males employ two primary mate-locating tactics: perching (waiting at vantage points on host plants for passing females) and patrolling (actively flying through habitat to search for females). Males exhibit behavioral thermoregulation at perching sites, adjusting body posture and wing orientation to maintain optimal thoracic temperature for rapid takeoff. Territorial defense involves aerial pursuits and physical interactions with intruding males. Adults, particularly males, engage in puddling behavior at moist soil along stream margins to obtain minerals.

Larval herbivore on hackberry; contributes to nutrient cycling through larval feeding. Adults may facilitate nutrient transfer through puddling behavior and subsequent excretion. Serves as prey for various predators including birds and insects.

Subject of ecological and behavioral research, particularly regarding mate-locating strategies and thermoregulation. Occasionally observed by butterfly enthusiasts in the southwestern U.S. Not considered an agricultural pest.

• Asterocampa clytonTawny Emperor; occurs in eastern and central U.S., overlapping in Texas; differs in wing pattern details and habitat preference (more mesic environments)
• Asterocampa celtisHackberry Emperor; more widespread in eastern U.S.; differs in distribution and subtle wing pattern characteristics

• butterfly
• Nymphalidae
• desert
• hackberry
• mate location
• thermoregulation
• puddling
• territoriality

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Eric: September 2010
• Bug Eric: Mother (Nature's) Day in Madera Canyon
• Mutillidae | Beetles In The Bush
• December | 2013 | Beetles In The Bush | Page 2
• Lepidoptera | Beetles In The Bush | Page 6
• Behavioural thermoregulation at mate encounter sites by male butterflies (Asterocampa leilia, Nymphalidae)
• Male mate-locating behavior in the desert hackberry butterfly, Asterocampa leilia (Nymphalidae)
• Behavior of male desert hackberry butterflies, Asterocampa leilia (Nymphalidae) at perching sites used in mate location