Lasius rabaudi

This species exhibits temporary social parasitism. Queens found new colonies by infiltrating an established nest of Lasius niger, killing the queen and using host workers to care for her initial brood.

Identification
A common Palaearctic species very close to Lasius umbratus and safely distinguishable only in the queen caste.

Distribution based on Regional Taxon Lists
Palaearctic Region: Afghanistan, Denmark, France, Georgia, Iberian Peninsula, Morocco, Poland, Slovakia, Spain, Turkey.

Biology
While this species is known to be a temporary parasite of, Starcke has suggested, based on observational evidence, that it can serve, in turn, as the host for the temporary parasite.

Nomenclature

 *  rabaudi. Formicina rabaudi Bondroit, 1917a: 177, fig. 2 (q.) FRANCE.
 * Emery, 1924c: 170 (w.); Wilson, 1955a: 169 (m.).
 * Combination in Lasius (Chthonolasius): Emery, 1925b: 233.
 * Junior synonym of umbratus: Bourne, 1973: 25; van Boven, 1977: 151.
 * Status as species: Bondroit, 1918: 35; Bondroit, 1920a: 144; Wilson, 1955a: 168 (redescription); Bernard, 1967: 364 (redescription); Baroni Urbani, 1971c: 212; Kutter, 1977c: 234; Azuma, 1977: 117; Arnol'di & Dlussky, 1978: 555 (in key); Collingwood, 1978: 89 (in key); Yamauchi, 1979: 169; Agosti & Collingwood, 1987b: 281 (in key); Seifert, 1988a: 159 (redescription); Seifert, 1990: 11; Bolton, 1995b: 225.

Worker
Wilson (1955) - (1) The most reliable queen character, the flattening of the scape, seems to be reflected in the worker, but there is considerable overlap between the two species, and probably a majority of worker series unaccompanied by queens cannot be certainly placed. Series of Lasius umbratus accompanied by queens are characterized as follows: in workers with maximum midpoint scape width of 0.10-0.12 mm., the minimum midpoint width was always 0.08 mm. or more. In the two series of Lasius rabaudi accompanied by queens ("Morogi-Mura" and Roermond) the minimum width was distinctly less than 0.08 mm. However, other series unaccompanied by queens, and therefore not determinable by reference to the rabaudi type, completely overlapped determined umbratus and extended far below the identified rabaudi series, to minimum width 0.06 mm.

(2) The "Morogi-Mura" and Roermond series and others with greatly flattened scapes also had abundant standing hairs on the scapes, which character is frequent in umbratus only in northern Eurasian samples.

Queen
Wilson (1955) - (1) Scapes and tibiae conspicuously flattened, so that the minimum width of the 'scape at the midpoint is 0.10 mm. or less (Fig. 15).

(2) Funicular segments tending to be proportionately longer than in umbratus. In the rabaudi series examined, funicular segment III varied 1.47-1.87 X longer than broad, while an equivalent sample of Eurasian umbratus varied 1.00-1.50 X longer than broad, with only one specimen exceeding the rabaudi minimum of 1.47 X.

(3) The shape of the petiole characteristic, and less variable than in umbratus: in frontal view subquadrate, nearly as broad at the dorsal crest as at the level just above the frontal foramen, and with a rounded to angulate dorsal emargination. European series have concave to straight lateral margins; Japanese series may have convex margins in addition.

Male
Wilson (1955) - Males associated with very flat-scaped workers from Roermond are rather small compared to umbratus (HW about 0.98 mm.) and show certain expected allometric differences in mandibular and petiolar structure, but in this and every other character they are within the extreme range of variation of umbratus. There is no appreciable flattening of the scapes.

Type Material
Wilson (1955) - HOLOTYPE. An alate queen in the Bondroit Collection.

References based on Global Ant Biodiversity Informatics

 * Agosti D. 1983. Zur Insektenfauna der Umgebung der Vogelwarte Sempach, Kanton Luzern. XIII. Hymenoptera 2: Formicidae (Ameisen). Entomologische Berichte Luzern 10: 91-92.
 * Agosti, D. and C.A. Collingwood. 1987. A provisional list of the Balkan ants (Hym. Formicidae) and a key to the worker caste. I. Synonymic list. Mitteilungen der Schweizerischen Entomologischen Gesellschaft, 60: 51-62
 * AntArea. Accessed on February 5th 2014 at http://antarea.fr/fourmi/
 * Antarea (Personal Communication - Rumsais Blatrix- 27 April 2018)
 * Antarea (at www.antarea.fr on June 11th 2017)
 * Baroni Urbani C., and C. A. Collingwood. 1976. A Numerical Analysis of the Distribution of British Formicidae (Hymenoptera, Aculeata). Verhandlungen der Naturforschenden Gesellschaft in Basel 85: 51-91.
 * Baroni Urbani C., and C. A. Collingwood. 1977. The zoogeography of ants (Hymenoptera, Formicidae) in Northern Europe. Acta Zoologica Fennica 152: 1-34.
 * Barrett K. E. J. 1968b. The distribution of ants in central southern England. Transactions of the Society for British Entomology 17: 235-250.
 * Bernard F. 1967. Faune de l'Europe et du Bassin Méditerranéen. 3. Les fourmis (Hymenoptera Formicidae) d'Europe occidentale et septentrionale. Paris: Masson, 411 pp.
 * Bernard F. 1973. Tendances calcicoles ou silicicoles chez les fourmis méditerranéennes. Pp. 16-21 in: International Union for the Study of Social Insects. Congress 1973. Proceedings IUSSI VIIth International Congress, London, 10-15 September, 1973. Southampton: University of Southampton, vi + 418 pp.
 * Bezdecka P. 1996. The ants of Slovakia (Hymenoptera: Formicidae). Entomofauna carpathica 8: 108-114.
 * Bondroit, J.. "Notes diverses sur des fourmis d'Europe." Annales de la Société Entomologique de Belgique 59 (1920): 143-158.
 * Borowiec L. 2014. Catalogue of ants of Europe, the Mediterranean Basin and adjacent regions (Hymenoptera: Formicidae). Genus (Wroclaw) 25(1-2): 1-340.
 * Cagniant, H.. "Étude de quelques fourmis marocaines. Statistique provisoire des Formicidae du Maroc." Bulletin de la Société d' Histoire naturelle de l' Afrique du Nord 53 (1964): 83-118.
 * Casevitz-Weulersse J., and C. Galkowski. 2009. Liste actualisee des Fourmis de France (Hymenoptera, Formicidae). Bull. Soc. Entomol. Fr. 114: 475-510.
 * Casevitz-Weulersse J., and M. Prost. 1991. Fourmis de la Côte-d'Or présentes dans les collections du Muséum d'Histoire Naturelle de Dijon. Bulletin Scientifique de Bourgogne 44: 53-72.
 * Choi B.M. 1985. Study on distribution of ants (Formicidae) from Korea (1). Formic fauna in Mt. Songni. Cheongju Sabom Taehak Nonmunjip (Journal of Cheongju National Teachers' College) 22:401-437.
 * Choi B.M. 1986. Studies on the distribution of ants (Formicidae) in Korea. Journal of Chongju National Teacher College 23: 317-386.
 * Collingwood C. A. 1961. The third Danish Expedition to Central Asia. Zoological Results 27. Formicidae (Insecta) from Afghanistan. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening 123: 51-79.
 * Collingwood C. A. 1971. A synopsis of the Formicidae of north Europe. Entomologist 104: 150-176
 * Collingwood C. A. 1976. Ants (Hymenoptera: Formicidae) from North Korea. Annales Historico-Naturales Musei Nationalis Hungarici 68:
 * Collingwood C.A. 1957. The Species of Ants of the Genus Lasius in Britain. Journal of the Society for British Entomology. 5: 204-214
 * Collingwood C.A. 1961. New Vice-County Records for British Ants. Entomologist. 73: 90-93
 * Collingwood, C. A. 1958b. A key to the species of ants (Hymenoptera, Formicidae) found in Britain. Trans. Soc. Br. Entomol. 13: 69-96
 * Collingwood, C. A. 1964. The Identification of British Ants (Hym. Formicidae). Transactions of the Society for British Entomology. 16:93-121.
 * Collingwood, C. A.. "The Lasius (Chthonolasius) umbratus (Hym., Formicidae) species complex in north Europe." Entomologist (London) 96 (1963): 145-158.
 * Collingwood, C. A.. "The third Danish Expedition to Central Asia. Zoological Results 27. Formicidae (Insecta) from Afghanistan." Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening 123 (1961): 51-79.
 * Emery, C.. "Hymenoptera. Fam. Formicidae. Subfam. Formicinae." en Wytsman, P. "Genera Insectorum" 183 (1925): 1-302.
 * Galkowsky C. 2010. Lasius rabaudi (BONDROIT, 1917) (Hymenoptera, Formicidae) retrouvé en France Bull. Soc. Linn. Bordeaux 145 (N. S.) nº 38: 139-147.
 * Galkowsky, C.. "Lasius rabaudi (BONDROIT, 1917) (Hymenoptera, Formicidae) retrouvé en France." Bull. Soc. Linn. Bordeaux 145 (N. S.) nº 38, no. 2 (2010): 139-147.
 * Gratiashvili N., Barjadze S. 2008. Checklist of the ants (Formicidae Latreille, 1809) of Georgia. Proceedings of the Institute of Zoology (Tbilisi) 23: 130-146.
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Kim B.J. 1996. Synonymic list and distribution of Formicidae (Hymenoptera) in Korea. Entomological Research Bulletin Supplement 169-196.
 * Kiran K., and C. Karaman. 2012. First annotated checklist of the ant fauna of Turkey (Hymenoptera: Formicidae). Zootaxa 3548: 1-38.
 * Kofler A. 1995. Nachtrag zur Ameisenfauna Osttirols (Tirol, Österreich) (Hymenoptera: Formicidae). Myrmecologische Nachrichten 1: 14-25.
 * Le Moli F., and A. Zaccone. 1995. Ricerche sulla mirmecofauna del Cansiglio (Prealpi Carniche). Soc. Ven. Sc. Nat. 20: 33-52.
 * Paik W.H. 1984. A checklist of Formicidae (Hymenoptera) of Korea. Korean J. Plant Prot. 23(3): 193-195.
 * Park, Seong, Joon and Byung, and Kim, Jin. 2002. Faunal Comparison of Ants among Cheongsando and Other Islands of South Sea in Korea. Korean Jornal of Entomology. 32(1):7-12.
 * Petrov I. Z., and C. A. Collingwood. 1992. Survey of the myrmecofauna (Formicidae, Hymenoptera) of Yugoslavia. Archives of Biological Sciences (Belgrade) 44: 79-91.
 * Pisarski B. 1964. Fauna Mrowek Afganistanu. Bibliogr. k. 160-166, Nieoprawiony maszynopis pracy, Praca doktorska. Instytut Zoologiczny PAN, 1964, Bibliogr. p. 160-166
 * Rigato F., and R. Sciaky. 1989. Contributo alla conoscenza della mirmecofauna della Val Gesso (alpi Marittime) (Hymenoptera, Formicidae). Boll. Mus. Reg. Sci. Nat. Torino 7(2): 427-442.
 * Rigato F., and R. Sciaky. 1991. The myrmecofauna of the Gesso Valley (Maritime Alps) (Hymenoptera Formicidae). Ethology Ecology and Evolution Special Issue 1: 87-89.
 * Terayama M. 1983. Kagoshima-ken-hondo no ari. Kanagawa-chucho (Journal of the Kanagawa Entomologists Association): 13-24.
 * Wilson E. O. 1955. A monographic revision of the ant genus Lasius. Bulletin of the Museum of Comparative Zoology 113: 1-201
 * Yamauchi K. 1979. Taxonomical and ecological studies on the ant genus Lasius in Japan (Hymenoptera: Formicidae). I. Taxonomy. Sci. Rep. Fac. Educ. Gifu Univ. (Nat. Sci.) 6: 147-181.