Lady beetles in focus - Spurleg Lady Beetles
Spurleg Lady Beetles (genus Brachiacantha) are typically small (2 - 6 mm), forest-dwellers. Their common name (Spurleg) refers to a spur on the tibia of their front legs. This genus holds over 20 species, with 5 species that have been found in Vermont. Click the links below to view each species profile on the VAL website:
- Ten-spotted Spurleg Lady Beetle (Brachiacantha decempustulata)
- Brachiacantha felina
- Undoubtable Lady Beetle (Brachiacantha indubitabilis)
- Four-spotted Spurleg Lady Beetle (Brachiacantha quadripunctata)
- Ursine Spurleg Lady Beetle (Brachiacantha ursina)
Ursine and Four-spotted Spurleg Lady Beetles (and likely other Vermont Spurleg Lady Beetles as well) are associated with ant nests in their larval stage, developing underground in an ant colony.
Spurleg Lady Beetles can be difficult to find, since they are largely forest-dwelling. However, Spurleg Lady Beetles can occasionally be found using sweep netting in lower vegetation, especially in fields or shrubby areas that are surrounded by forests. Some species, such as Brachiacantha felina and Four-spotted Spurleg Lady Beetle seem to preferentially or frequently utilize edge habitats, respectively, and are more commonly found on some grasses and legumes. The Ursine Spurleg Lady Beetle also uses edge habitats, crops, and early successional areas. Also, Ursine Spurleg Lady Beetles are associated with milkweed, so they are a great species to survey for when looking for Monarch Butterfly caterpillars!
Spurleg Lady Beetles can express intraspecific variability, and many species look relatively similar. When photographing these species, try to take photos of all angles of the beetle (head, pronotum - middle segment, wing covers, and underside). Additionally, measure the beetle if possible. These species have been found in the greatest numbers between May and July, so be on the lookout for them in the coming weeks!
Ursine Spurleg Lady Beetle, © Nathaniel Sharp
