Sociobiology, Vol. 49, No. 2, 2007 Ants of the Idaho National Laboratory By William H. Clark & Paul E. Blom SOCIOBIOLOGY is a serial published by the Department of Biologi- cal Sciences of California State University, Chico 95929-0515, U.S.A. It is published in volumes of a minimum of 320 pages and it is printed and dis- tributed in paper bound fascicles as manuscripts and finances permit. There are usually 3 fascicles per volume. The (2007) price of each volume is $75.00 U.S. There are 2 volumes per year therefore a subscription is $150.00. Pay- ment by credit card is encouraged. Prices for individual fascicles are provided upon request. A fee is added to overseas subscriptions to partially cover the additional mailing costs for delivering such subscriptions. The serial is devoted to papers giving research results, review articles, or translations of classic papers on any aspect of the biology of social animals. 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Blom CONTENTS Abstract .................................................................................................................... 1 Introduction ............................................................................................................ 2 Materials and Methods ......................................................................................... 8 Results and Discussion ...................................................................................... 14 Identification Keys ............................................................................................... 17 Subfamilies of Formicidae ............................................................................ 17 Genera and species .......................................................................................... 18 Dolichoderinae ............................................................................................... 18 Formicinae ....................................................................................................... 18 Myrmicinae ...................................................................................................... 24 Species Accounts ................................................................................................. 26 Dolichoderinae ............................................................................................... 27 Forelius .............................................................................................................. 28 Liometopum ..................................................................................................... 29 Tapinoma ......................................................................................................... 30 Formicinae ....................................................................................................... 33 Camponotus ..................................................................................................... 33 Formica ............................................................................................................. 36 fusca group ....................................................................................................... 37 microgyna group ............................................................................................. 42 neogagates group .................................................................................................. 45 Clark, W.H. & P. E. Blom — Ants on the Idaho National Laboratory vii rufa group ........................................................................................................ 50 sanguinea group .............................................................................................. 59 Lasius ................................................................................................................ 62 Myrmecocystus ................................................................................................. 66 Polyergus ........................................................................................................... 68 Myrmicinae ...................................................................................................... 69 Aphaenogaster .................................................................................................. 69 Formicoxenus ................................................................................................... 71 Manica .............................................................................................................. 73 Messor ............................................................................................................... 74 Monomorium ................................................................................................... 76 Myrmica ........................................................................................................... 78 Pheidole ............................................................................................................ 80 Pogonomyrmex ................................................................................................ 81 Solenopsis .......................................................................................................... 85 Stenamma ........................................................................................................ 87 Temnothorax .................................................................................................... 88 Conclusions .......................................................................................................... 91 Glossary ................................................................................................................. 93 Acknowledgments ............................................................................................... 96 Literature Cited .................................................................................................... 96 Color plates showing ant species .....................................................................106 Index ......................................................................................................................114 Home page: www.csuchico.edu/biol/Sociobiology/sociobiology- index.html Editor: David H. Kistner, Dept. of Biological Sciences, California State University, Chico, CA 95929-0515, U.S.A. Resident Associate Editor: Michael J. Erpino, Dept. of Biological Sciences, California State University, Chico, CA 95929-0515, U.S.A. viii Sociobiology Vol. 49, No. 2, 2007 Associate Editors: Murray S. Blum, Dept. of Entomology, University of Georgia, Athens, GA 30601, U.S.A. Ralph W. Howard, USDA-ARS, U.S. Grain Marketing Research Labora- tory, 1550 College Av., Manhattan, KS 66502, U.S.A. Web Page Editor: Kelly Wood-Hohenstein, Dept. of Biology, Butte College, 3536 Butte Campus Drive, Oroville, CA 95965-8399, U.S.A. Annotated Checklist of the Ants on the Idaho National Laboratory (Hymenoptera: Formicidae) by William H. Clark1 & Paul E. Blom2, 3 Abstract Many invertebrates, including ants, tunnel and nest in soils. Because of these habits they are potentially important at the Idaho National Laboratory (INL) where they may tunnel into and disturb buried waste. Ants are very important components of the desert ecosystem based on their distribution, habitat preferences, food habits, and relative abundance. For these reasons the ant taxa present at the INL were investigated. A cursory survey of the ants at the site was published in 1971 which reported 22 species. A more thorough examination was needed. Our research in the northeastern portion of the Snake River Plain at the INL from