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bees & wasps ______________________________________________________________________ ANTS Legakis (1985) was unable to include Thásos in his biogeographical analysis of the ant fauna of the Greek islands as insufficient information was available. However, the fauna can be expected to be rich, perhaps in the region of 70 species or more given that Collingwood (1993) was able to find 41 species on Karpathos in a brief visit and Agosti & Collingwood (1987a) report 161 species from northern Greece. As a contribution to the study of ant biogeography in the Aegean I have collected ants for Cedric Collingwood during my visits and from this material he has identified 29 taxa. Of these, Tetramorium splendens, Camponotus atricolor and C. oertzeni are not listed by Agosti & Collingwood (1987a) as having been recorded from Greece, whilst Myrmica bessarabica, Tetramorium cf. punctatum, Lepisiota bipartita, L. caucasica and Lasius citrinus are not reported by these authors from the Balkan region. The taxonomy and identification of ant species is beset with problems, although in recent years there has been considerable progress towards standardisation of nomenclature (Bolton, 1994). Numerous keys to identification exist for different parts of Europe but Agosti & Collingwood (1987b) provide the most comprehensive keys to the  worker caste of ants on the Aegean islands. Most ant species on Thásos are inconspicuous and require specialist survey to locate them, however a few species cannot fail to be noticed by visitors. Cataglyphis nodus is a large red and black ant that nests in sandy soils on tracksides and in coastal olive groves. The workers are very active during the heat of the day and run quickly in zig-zag paths with their dark abdomens (gaster) held at an angle above their bodies. The harvester ants Messor spp. are widely distributed on Thásos and are remarkable for their large flat nests composed almost entirely of seed husks. M. muticus and M. wasmanni appear to be the commonest of these large shiny black ants but M. orientalis also occurs. CHECKLIST   (nomenclature follows Agosti & Collingwood 1987a, although some sub-specific taxa have now been allocated specific status, and incorporates revisions included in Bolton 1994)     Myrmicinae Pheidole pallidula (Nylander) Myrmica bessarabica Nasarov Aphaenogaster subterraneoides Emery Messor muticus Nylander Messor orientalis (Emery) Messor wasmanni Krausse Crematogaster schmidti (Mayr) Solenopsis sp. 1 Leptothorax affinis Mayr Leptothorax exilis Emery Leptothorax rougeti Bondroit Leptothorax semiruber Andre Leptothorax unifasciatus (Latreille) Tetramorium ?punctatum Santschi Tetramorium splendens Ruzsky   Formicinae Plagiolepis pygmaea (Latreille) Plagiolepis vindobonensis Lomnicki Lasius alienus (Foerster) Lasius citrinus Emery Camponotus aethiops (Latreille) Camponotus atricolor (Nylander) Camponotus concavus Dalla Torre Camponotus creticus Forel Camponotus oertzeni Forel Camponotus piceus (Leach) Cataglyphis nodus (Brulle) Formica cunicularia Latreille Lepisiota bipartita (Smith) Lepisiota caucasica Santschi REFERENCES Agosti, D. & Collingwood, C.A. 1987a. A provisional list of the Balkan ants (Hym., Formicidae) and a key to the worker caste. I. Synonomic list. Bulletin de la Societé Entomologique Suisse, 60: 51-62 Agosti, D. & Collingwood, C.A. 1987b. A provisional list of the Balkan ants (Hym., Formicidae) and a key to the worker caste. II. Key to the worker caste, including the European species without the Iberian. Bulletin de la Societé Entomologique Suisse, 60: 261-293 Bolton, B. 1994. Identification guide to ant genera of the world. Harvard University Press. Collingwood, C.A. 1993. A comparative study of the ant fauna of five Greek islands. Biologia Gallo-Hellenica, 20: 191-197 Legakis, A. 1985. Contribution to the zoogeography of ants (Hymenoptera, Formicidae) in the Greek islands. Biologia Gallo-Hellenica, 10: 253-257