HOUSE-INFESTING ANTS of the EASTERN UNITED STATES
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HOUSE-INFESTING ANTS of the EASTERN UNITED STATES Tlwir RacopttiiNi, Biology, »ni Ecomiiilc Importaiieo ft. vm. «F MimiiK^ iTWWL »SE'CUITUMI IffiMi JÜL 121965 CUIEHTSEIULIËGIHI^ Technkai BuMfliii No, 1328 ^rieidtunl^MwrA Swvice UNITED STATES DEPARTMENT OF A6RIC0LT«RE ACKNOWLEDGMENTS The author grateñilly acknowledges tihe assistiuice of individuals listed below on one or more aspects of ants discussed in this bulletin : Allen Mclntosh (now retired), and J. A. Fluno, U.S. Department of A^culture, Beltsville, Md.; Ö. T. Vanderford, Georgia State Board of Entomology. Atlanta; J. C. Mo^r, ^uthem Forest Experiment Station, tT.S. Department of Agriculture, Alexandria, La. ; Arnold Van Pelt, formerly with Tusculum College, Greeneville, Tenn.; Mar^ Talbot, Lindenwood College, St. Charles, Mo.; M. S. Blum, ïxxuisiana State University, Baton Bouge; and M. H. Bartel, Kansas State Universitv, Manhattan. He is indebted for the illu^ra- tions to Arthur D. Cushman and the now deceased Sarah H. DeBord. Some of the illustrations have hee^ used previously (Smith, 1947, 1950). Ck>yer mustration : Worker of black carpenter ant Camponotui pennsylvanUmn (DeGeer). HOUSE-INFESTING ANTS of THE EASTERN UNITED STATES Their Recognition, Biology, and Economic Importance By Marion R. Smith Entomoiogy Researcli Division Teclinical Buiietin No. 1326 Agricuiturai Researcit Service UNITED STATES DEPARTIRENT OF AGRICULTURE Washington, D.C. Issued May 1965 For sale by the Superintendent of Documents, U.S. Oovemment Printing Office Washington, D.C., 20402 - Price 46 cents Contents page Introduction }■ Classification and Bionomics ^ Economic Importance 4 Collecting, Shipping, and Identifying Ants 7 Key to Subfamilies of Formicidae 9 Keys to Species J^ Discussion of the Species. |7 Labidus coecus (Latreille) 17 Neivamyrmex nigrescens (Cresson) 18 Neivamyrmex opacithorax (Emery) 19 Aphaenogaster lamellidens Mayr 20 Aphaenogaster ruáis (Emery) 21 Aphaenogaster tennesseensis (Mayr) ^^ Aphaenogaster fulva Roger ^| Pheidole bicarinata vinelandica Forel ^^ Pheidole floridana Emery 26 Pheidole dentata Mayr ^ Crematogaster ashmeadi Mayr ^o Crematogaster cerasi (Fitch) ^ Orematogaster clara Mayr ^1 Crematogaster lineolata (Say) ^^ Monomorium minimum (Buckley) ^ Monomorium pharaonis (Linnaeus) ^^ Monomorium floricola (Jerdon) ^6 Monomorium destructor (Jerdon) ^ Solenopsis xyloni McCook _ _ ^ Solenopsis geminaia (Fabricius) ^V Solenopsis saevissima richteri Forel ^1 Solenopsis molesta (Say) j^ Tetramorium caespitum (Linnaeus) ^ Tetramorium guiñéense (Fabricius) ^o Wasmannia auropunctata (Roger) ^ Atta texana (Buckley) ^" Iridomyrmex humilis (Mayr) — ^ Iridomyrmex pruinosus (Roger) ^ Dorymyrmex pyramicus (Roger) ^¡^ Tapinoma sessile (Say) ^^ Tapinoma melanocephalum (Fabricius) ^ Camponotus castaneus (Latreille) ^ Camponotus tortuganus Emery ^^ Camponotus pennsylvanicus (DeGeer) ^ Camponotus ferrugineus (Fabricius) rr--- «o Camponotus abdominalis floridanus (Buckley) oy Camponotus caryae discolor (Buckley) ¡}^ Camponotus nearcticus Emery ^^ Camponotus rasilis Wheeler— 'J^ Paratrechina longicornis (Latreille) *J^ Paratrechina (Nylanderia) spp ¡^ Prenolepis imparis (Say) ^g Lasius alienus (Foerster) ^^ Lasius neoniger Emery ^. Lasius umbratus (Nylander) ^ Acanthomyops claviger (Roger) |^ Acanthomyops interjectus (Mayr) °° Acanthomyops murphyi (Forel) °^ Acanthomyops latipes (Walsh) ^^ Glossary og Bibliography n HOUSE-INFESTING ANTS OF THE EASTERN UNITED STATES: Their Recognition, Bioiogy, and Economic Importance By Marion R. Smith,* entomologist, Entomology Research Division^ Agricultural Research Service INTRODUCTION Each year numerous requests for information on the identification and control of house-infesting ants are received by various Federal and State agencies, colleges and universities, boaras of health, and pest-control operators. Individuals in these organizations who handle such requests find themselves greatly handicapped because of the lack of comprehensive literature dealing with common house-infesting ants. Often they are unable to identify the ants either to genus or species. This bulletin has been prepared to take care of some of the needs of technical and semitechnical workers. However, no attempt has been made to cover the highly specialized field of ant control. Originally, I had hoped to include all house-infesting ants of the United States. Because of the lack of knowledge of these ants in several regions, espe- cially western North America, it was thought best to include only ants of the eastern United States. However, many of the ants discussed occur also in the Western States. In this bulletin I have furnished keys to species, based on workers of all the well-known, house-infesting ants of the eastern United States. Each species is fully describe and figured, and its biology and economic importance discussed. I have also given the available common names oi the species (including those approved by the Ento- mological Society of America) ; stated whether the ant was intro- duced, and if so, its probable original home ; outlined its range of dis- tribution, especially in the United States; and indicated wh^her it has been confused with other species. Technical terms are given in a glossary. Important references are listed under each species and also in the bibliography. Because the biology of only a very few ants has been intensively studied, much of the information given is based on miscellaneous observations. Although the bulletin deals primarily with ants as house pests, every way in which a species is known to be inimical to man is also mentioned. When ants infest a house, they may be represented by workers, females, or males, or any possible combination of these castes. Since the worker is the most common, troublesome, and best known, this bulletin deals with it only. Smith (1943) presents a means of identifying males to genus, and Creiçhton (1950), of females and workers to species. However, the identification of males and females to species is a difficult task and is not generally recommended. 1 Retired. 2 TECHNICAL BULLETIN 132 6, U.S. DEPT. OF AGRICULTURE Classification and Bionomics Ants belong to the order Hymenoptera, which also includes the wasps and bees. The ants comprise the family Formicidae, and are distinguished from their nearest relatives by two important charac- ters : One of these is the differentiation of the abdomen into two well- marked regions—a slender, one- or two-segmented, freely moving ped- icel, and a larger, more compact terminal portion, the gaster ; the other separating character is the elbowed antenna, in which the first seg- ment, or scape, is greatly elongated in both the female and the worker. In the male, the antenna frequently does not appear to be elbowed, since the scape is not always noticeably lengthened. Ants can be distinguished from termites, with which they are com- monly confused, by the strong constriction or "waist" between the thorax and the abdomen, and the two pairs of wings of which the an- terior pair is much larger than the posterior pair, both having few veins. Termites, on the other hand, have two pairs of wings, approxi- mately equal in size with numerous veins. TTiey have a tendency to lose their wings more readily than the ants. Termites also differ from the winged ants in that the abdomen is broadly joined to the thorax. There are normally three distinct castes of ants : Workers, females, and males. The male is generally winged, and retains its wings until death. Its size is usually intermediate between that of the worker and the female, and the male is characterized by its protruding genital appendages, the presence of ocelli, poorly developed or vestigial man- dibles, and extraordinarily large eyes, which are out of proportion to the remainder of the head. Apparently, the sole function of the male is to mate with the unfertilized female ; when mating has been accom- plished, the male perishes. Mating may take place in the nest, on the ground, or in the air. Males are produced in old or very large colonies only, where there is an abundance of food, since much nourishment is required to bring males to maturity. After attaining maturity, the male usually does not remain long in the parental nest. After leav- ing it, he may even succumb to predators and the elements without having mated. The female, generally the largest of the three castes, normally pos- sesses wings but loses them after mating. She usually possesses three ocelli in addition to the pair of large compound eyes, a large thorax to accommodate the two pairs of wmgs, and a large abdomen for the production of numerous eggs. The primary function of the female or queen is reproduction, but in many of the more highly specialized ants, the queen also cares for and feeds the first bro(KÍ of workers on her salivary secretions. She may live for many years ; upon her death she is commonly replaced by a daughter queen. However, ants may have one or more queens, according to the species. The worker, which is also a female, is never winged except as a rare abnormality. The workers of most species lack ocelli. The thorax is simple, apparently composed of three segments, but in reality there are four. Workers are not always of the same size or morphological structure in a given species. When workers are of approximately the same size and structure within a species, we say the species is HOUSE-INFESTING ANTS OF THE EASTERN UNITED OTATES 3 monomorphic (one form) (example: the Argentine ant//»¿¿ömyTmöic humilis (Mayr) ). When workers within