Labour Day Ant
Head: Medium brown, hairy. Eyes large, but not as large as L. alienus.
Antenna: Dull yellowish-brown.
Thorax: Dull yellowish-brown to slightly reddish, lighter than head and abdomen.
Wings: Both male and female have slightly tinted wings, veins and stigma yellowish-brown. No pattern or dark shading.
Legs: Light to medium brown. Four erect hairs on hind shin (tibia).
Abdomen: Medium brown. Top of abdomen hairy.
Queen similar, but has darker thorax. Male is entirely black.
Similar Species: Easily confused with Lasius alienus workers which have larger eyes and much darker brown to black color. L. alienus live in damp, shady parts of a forest. Lasius neoniger live in open, dry areas like lawns.
Size: Workers 2.5 to 3 mm. Males 4 mm, Queens 7 to 8 mm
Habitat: Meadows, grass, prairies, sand dunes; well-drained soil in cultivated fields. Usually the dominant species in lawns and golf courses with dense populations creating craters above the soil.
Food: Mealybugs and aphid honeydew; other insects, dead or alive, and flower nectar.
Flight Time: Mid Aug to mid Sept. but usually around Labour Day. Late afternoon, just before rain.
Life Cycle: Nests in soil, forming volcanic-like mounds above ground level. Colony hibernates in winter with 1st instar larvae. Nocturnal, foraging at night for dead insects. Farms root aphids by storing aphid eggs in nest during the winter. When hatched, the ants carry them to plant roots to feed. If using the Corn Root Aphid Anuraphis maidiradicis the ants will transport them to the corn roots. They also tend honeydew from other insects like late-instar butterfly larvae of the Frosted Elfin Callophrys irus.
After the late-season nuptial flight, queens shed their wings, hibernate in small cavities in the soil and start a new colony the next spring. Queens will sometimes invade other Lasius species colonies. Often mixed colonies are found. Lasius in general and particularly neoniger do not sting or use formic acid. Mature nests usually contain from 1,000 to 10,000 individuals, and queens can live 15-20 years.
Predators: Yellow Jacket Wasps Vespula maculifrons prey on Lasius neoniger nuptial flights.
Cuckoo Wasp (Eucharitidae) Pseudometagea schwarzii lays eggs on plant flower buds, when hatched the larvae hitch a ride on the L. neoniger ant to the nest, where it feeds on the ant larvae.
Nest Mates: Short-winged Mold Beetle Adranes species are allowed in L. neoniger nests to live.
Comments: Essex County – Point Pelee National Park per BOLD in 2012. Wheeler recorded it from Sudbury.
For information on synonyms, references and type specimens see next page