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Figs. 102, 103.
Worker. Reddish yellow to brown: whole surface of body smooth and shining with scattered acute pale hairs. Antennal club 3 segmented as long as rest of funiculus; propodeal spines short, set horizontally. Length: 2.8-3.4 mm.
Queen. Very like the worker, somewhat darker; eyes larger and ocelli present. Forewings with 1 cubital cell and 1 discoidal cell with open radial cell. Length: 3.4-3.6 mm.
Male. Worker like but with additional antennal and gaster segments; ocelli present. Antennae with funiculus relatively longer, terminating in 4 segmented club. Length: 2.8-3.2 mm.
Distribution. Throughout Denmark and Fennoscandia; local in England and Scotland. - Range: Spain to Eastern Siberia, North Italy to latitude 70° N.
Biology. This ant occurs only in the nests of Formica rufaHNS and allied mound building species. It is ignored by its host among which the inquiline species moves freely. Individual nests contain only a few individuals, up to about 100, but often several nests are present within one mound of the host. Nests are located in fragments of wood, hollow twigs, bases of old bracken stems and in the earth floor of the FormicaHNS mound. Intermediate forms between queen and worker are common and individuals normally remain concealed within the nests but may wander on the mound surface on warm dull days. It is not known to feed on the FormicaHNS brood but in captivity will destroy LeptothoraxHNS larvae. Males and winged females may be found during July and August, mating occurring on the surface of the FormicaHNS mound.
Found most commonly in these habitats: 12 times found in Unknown, 1 times found in Pinusmugo+prado, 1 times found in closed forest, 1 times found in heathlands, 1 times found in mixed forest, 1 times found in pine forest.
Found most commonly in these microhabitats: 1 times Log into Formica nest, 2 times Formica polyctena nest, 1 times mound, forest edge.
Collected most commonly using these methods: 4 times Manual catch, 3 times search, 1 times Hand, 1 times Pitfall trap.
Elevations: collected from 1650 - 1910 meters, 1823 meters average
Type specimens: type of Myrmica nitidula: focol2046