The Formicidae (Hymenoptera) of Fennoscandia and Denmark.
Author
Collingwood, C. A.
text
Fauna Entomologica Scandinavica
1979
8
1
174
http://antbase.org/ants/publications/6175/6175.pdf
journal article
6175
39.
Lasius meridionalis
(Bondroit, 1919)
Figs. 143-146.
Formica meridionalis Bondroit
, 1919:143.
Lasius
meridionalis (Bondroit)
; Pisarski, 1975.
Lasius rabaudi Bondroit, sensu
Wilson, 1955; Collingwood, 1963; Kutter, 1977.
Worker: Clear yellow; pubescence on head rather dilute but close and very fine on gaster. Funiculus segments distinctly longer than wide; scapes and tibiae elliptical in cross section with thin front edge. Petiole sides straight to weakly convex, dorsal margin flat to slightly emarginate. Body and appendage hairs numerous. Length: 3.5-5 mm.
Queen. Dark brownish black; general apparance shining with fine shallow microsculpture. Body pubescence dilute but close and very fine on gaster. Funiculus segments longer than wide; scapes and tibiae flattened with thin front edge. Scale straight sided, dorsal margin flat, occasionally weakly emarginate. Body and appendage hairs abundant. Head width 1.7-1.8 mm. Length: 7.0-8.0 mm.
Male. Black; clypeus and frons distinctly shining with weak microsculpture. Pubescence sparse except on gaster where it is very fine and close. Frontal triangle,
frontal
furrow and mandibular teeth very distinct. Head at least as broad as alitrunk. Eyes with erect hairs, appendage and body hairs numerous. Cross vein m-cu often absent on fore-wings. Length: 4.0-4.5 mm.
Figs. 139-142.
Lasius umbratus (Nyl.)
. - 139: worker in profile; 140: petiole scale of queen in anterior view; 141: head of queen in dorsal view; 142: head of male in dorsal view. Scale: 1 mm.
Distribution
. Local; Denmark: EJ, NWJ, LFM, NEZ, B. - Sweden: Sk., BL, Hall., 01. and Dir. - Norway: VE (Stolpestad). - Finland: N (Korverhar). - Locally common in Southeast England and South Wales. - Range: Spain to Japan, Italy to Scandinavia.
Biology. This species is characteristic of lowland sandy heath in North Europe. Nests are in the ground, often with low earth mounds and carton lined chambers. Flight period August. Fertilised queens start colonies through adoption by
L. alienus
. Males which have well toothed mandibles have been seen to pick up objects and to feed themselves.
Note. I have followed Pisarski (1975) in separating this species from
L. rabaudi
. According to examples of all castes kindly sent by P. Werner from Czechoslovakia,
L. rabaudi
has much more dilute but longer pubescence and has the gaster brilliantly shining
.
Bourne (1973) synonymised
L. rabaudi
i. e.
L. meridionalis
, in England as
L. umbratus
. However, the different habits, flat appendages and rectangular scale in the queen, shining darker colour and fine sculpture in queen and male clearly distinguish the species from
L. umbratus
, although workers may be less easy to separate.