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thatching ant
Formica obscuripes
49.2433, -122.973
Field Notes
Description:
Workers variable in size (body length ranging from about 4 to 8 mm) and colour. Larger individuals with head reddish-orange; thorax, legs and antennae reddish-orange to black; abdomen black. Smaller individuals often nearly all black or dark brown.
Habitat:
Grassy field on Annacis Island in the Fraser River delta.
Notes:
As seen in the last photo, this nest lacked the large mound that is typical of the species.
When we arrived at the nest, shortly after noon on a hot, sunny day, only a few workers were visible. More appeared soon after we shaded the nest openings with an umbrella. Some workers were engaged in carrying small pebbles up from the nest and depositing them on the surface.
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