Augochloropsis

Augochloropsis can be differentiated from other Augochlorini genera (Augochlora, Augochlorella) by the distinctive tegular morphology: tegulae are punctate, D-shaped, and bent inwards. These genera are otherwise virtually identical in appearance, requiring microscopic examination of tegular structure for reliable identification. From cuckoo wasps (Chrysididae), Augochloropsis can be distinguished by behavior—metallic sweat bees are commonly found on flowers, while cuckoo wasps are seldom flower visitors. Cuckoo wasps also exhibit quick, jerky movements and lack pollen-carrying structures on the legs. Augochloropsis may be confused with Agapostemon, but male Agapostemon have banded black and yellow abdomens rather than uniformly metallic coloration.

Small to medium-sized bees, 8–12 mm in length, with brilliant metallic integument. Coloration typically bright green or blue-green, with some species exhibiting gold, red, or purple coloration. Tegulae (small plates at wing base) are diagnostic: punctate, D-shaped, and bent inwards. This tegular morphology distinguishes Augochloropsis from other Augochlorini genera (Augochlora, Augochlorella) which require microscopic examination for reliable identification. Females possess scopae (pollen-collecting hairs) on hind legs.

Occurs in diverse environments across the New World tropics and subtropics, including forests, secondary growth, and open areas. Temperate North American species occupy meadows, gardens, and woodland edges. Nests are excavated in soft soil, with some species utilizing rotten wood. The subgenus Glyptochlora is restricted to Amazon Basin forests. Collection records indicate presence in wildlife areas, secondary Atlantic forest, and anthropogenic habitats including residential areas with suitable nesting substrates.

Restricted to the New World. The vast majority of species occur in tropical and subtropical regions of Central and South America. Temperate North American distribution includes seven documented species: A. anonyma, A. cuprea, A. fulgida, A. fulvofimbriata, A. metallica, A. sumptuosa, and A. viridula. No species have successfully colonized subarctic zones. The subgenus Glyptobasia occurs in the Atlantic Forest of eastern Brazil, while Glyptochlora is distributed in the Amazon Basin of Colombia, Peru, and Brazil.

Activity patterns vary by latitude and species. Augochloropsis anonyma is active from April to September in northern portions of its range and year-round in southern Florida. Augochloropsis iris exhibits an annual colony cycle from August to March in Brazil, with three phases of cell provisioning separated by two periods of inactivity. Temperate North American species are primarily active during spring and summer months.

Polylectic, collecting pollen from multiple plant families. Documented floral associations include: Baccharis, Bidens, Cirsium, Erigeron, Helenium, Ilex, Linaria, Melilotus, Metopium, Ocimum, Polygonum, Pycnanthemum, Rhus, Rubus, Trifolium, Asclepias, Berlandiera, Clethra, Crataegus, Eriogonum, Eryngium, Helianthus, Silphium, Stachys, and Vaccinium. The A. metallica species group has the most extensive floral records among temperate North American species, with 90 combined floral associations documented.

Nests are initiated by solitary females excavating a long main burrow straight down into soft soil, with a single lateral burrow extending horizontally perpendicular to the main. Brood cells hang vertically from this lateral burrow—a clustering pattern common to all Augochlorini, but the single main burrow with single lateral burrow structure is unique to Augochloropsis within the tribe. Social species exhibit annual colony cycles with multiple brood phases. In A. iris, queens are approximately 5% larger than workers, and sex ratios vary by brood phase (13–22% males).

Exhibits broad spectrum of social behaviors including solitary, communal, semisocial, and primitively eusocial nesting. Behavioral plasticity is characteristic—unlike species with fixed social systems, Augochloropsis shows variable social organization. Some species nest in aggregations with nest entrances within centimeters of each other. Division of labor has been documented, with nest-mates showing differential ovarian development. Guards at nest entrances appear effective at deterring some parasites, though not completely successful against mutillid wasps.

Pollinators of diverse flowering plants. Commonly collected in faunistic inventories, indicating ecological importance in wild communities. As polylectic foragers, they contribute to pollination across multiple plant families. Their broad activity windows and social lifestyles correlate with generalized foraging ecology.

Contribute to pollination services in natural and agricultural environments. Occasionally encountered in residential areas where suitable nesting substrates exist. Subject of ecological research on bee sociality and population monitoring methodology. Used in mark-recapture studies evaluating bee sampling protocols.

• AugochloraVirtually identical in appearance; distinguished only by microscopic examination of tegular structure (Augochloropsis has punctate, D-shaped, inward-bent tegulae)
• AugochlorellaVirtually identical in appearance; distinguished only by microscopic examination of tegular structure
• AgapostemonSimilar metallic green coloration; males distinguished by banded black and yellow abdomen (vs. uniformly metallic in Augochloropsis)
• Chrysididae (cuckoo wasps)Similar metallic appearance; distinguished by behavior (cuckoo wasps seldom on flowers, move with quick jerky motions), lack of pollen-collecting scopae, and parasitic lifestyle

• bees
• pollinators
• social insects
• metallic
• New World
• tropical

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Augochloropsis Archives - Entomology Today
• Bug Eric: Metallica
• How Mark-Recapture Methods Can Validate Wild Bee Sampling Protocols
• Taxonomic revision of the South American subgenus Augochloropsis (Glyptobasia) (Hymenoptera: Apidae: Halictinae)
• Filogenia y clasificación taxonómica de los subgéneros de Augochloropsis (Hymenoptera: Halictidae)
• The biology of the primitively eusocial Augochloropsis iris (Schrottky, 1902) (Hymenoptera, Halictidae)
• Taxonomic revision of Augochloropsis (Glyptochlora) Moure, a rare bee subgenus from the Amazon Basin (Hymenoptera: Halictinae)
• A New Species of the genus Augochloropsis Cockerell 1897 (Halictidae, Augochlorini) from Northeast Brazil, and a key to species from the Bahia State