ANTS - --- - BIG and small

Dinoponera australis - one of the largest ants in the world. Photo fromhttp://www.alexanderwild.com/

The biggest ants in the world are from the genus Dinoponera. The workers are about 3 cm in length (more than one inch). There are currently six valid species in the genus Dinoponera and they occur in Neotropical rainforests. The ant species Paraponera clavata, the giant Neotropical bullet ant, is also extremely large and the workers reach sizes of about an inch. Paraponera clavata also occurs in rainforests of the Neotropics and is distributed fromHonduras in the North to Brazil in the South.

There are many very small ant species and the smallest probably belong to the genus Carebara. This genus comprises 160 valid species, which are found almost worldwide.                                                           -Wiki

There are several small ants.
the following is from Wiki.......

Thief ants are tiny ants less than 1/16inch (1.3 to 1.8 mm) in length, probably the smallest ants found infesting structures. The workers are light brown or yellow in color. The antenna has 10 total segments and ends in a 2-segmented club. The first segment of the antenna is about half the length of the head. It has a sting at the tip of the abdomen, but the sting may not be exerted and visible.

Thief ants are found throughout the United States. The thief ant is likely not a single species but rather a group of closely related species. It has been estimated that dozens of species and subspecies could be involved in this group. This ant is nicknamed a "thief' because it commonly lives near the nests of other ants and "steals" their larvae and food to feed its own colony. They enter the other ants' nests by means of tiny passages that are too narrow for the larger ants. Thief ants may be considered beneficial because they kill and eat the immature forms of some pest ant species. In Florida, they are known to be predators of fire ant queens. 

Pharaoh ant

"The pharaoh ant (Monomorium pharaonis) is a small (2 mm) yellow or light brown, almost transparent ant notorious for being a major indoor nuisance pest, especially in hospitals. The origin of this "tramp" antis uncertain, although favoured proposals include West Africa and Indonesia. The Pharaoh ant has been introduced to virtually every area of the world including Europe, the Americas, Australasia and Southeast Asia. Pharaoh ants are a tropical species but they thrive in buildings anywhere, even in temperate regions provided central heating is present.

Colony behavior

The Pharaoh ant is polygynous, meaning its colonies contain many queens (up to 200). An individual colony normally contains 1,000–2,500 workers but a high density of nests gives the impression of massive colonies. Colonies also lack nestmate recognition so there is no hostility between neighbouring colonies, which is known as unicoloniality. They produce sexually reproductive individuals roughly twice a year in established colonies but in the laboratory colonies can be manipulated to produce sexuals at any time of year. Colonies proliferate by "budding"^[1] (also called "satelliting" or "fractionating"), where a subset of the colony including queens, workers and brood (eggs, larvae and pupae) leave the main colony for an alternative nest site. Budding is a major factor underlying the invasiveness of Pharaoh ants. A single seed colony can populate a large office block, almost to the exclusion of all other insect pests, in less than six months. Elimination and control are made difficult because multiple colonies can also consolidate into smaller colonies and "weather the storm" of a baiting programme only to repopulate when baiting is withdrawn. Pharaoh ants are a major hazard in hospitals, where their small size means they can access wounds, driplines, and instrumentation, causing the spread of infection and electrical interference.

Pharaoh ants have become a serious pest in hospitals, rest homes, apartment dwellings, hotels, grocery stores, food establishments and other buildings. They feed on a wide variety of foods including jellies, honey, shortening,peanut butter, corn syrup, fruit juices, baked goods, soft drinks, grease, dead insects, toothpaste and even shoe polish. They can also gnaw holes in silk, rayon and rubber goods.

Identification

Pharaoh workers are about 1/16-inch long, or 2.0 millimeters in length. They are light yellow to reddish brown in color with a darker abdomen (hind portion of body). There is a stinger. The petiole (narrow waist between the thorax and abdomen) has two nodes and the thorax has no spines. Eyes are poor and possess on average 32 ommatidia. The antennal segments end in a distinct club with three progressively longer segments.

Life Cycle and Habits

The pharaoh ant queen can lay hundreds of eggs in her lifetime. Most lay 10 to 12 eggs per batch in the early days of egg production and only four to seven eggs per batch later. At 27 °C (80 °F) and 80 percent relative humidity, eggs hatch in five to seven days. The larval period is 18 to 19 days, prepupal period three days and pupal period nine days. About four more days are required to produce sexual female and male forms. From egg to maturity takes about 38 to 45 days depending on temperature and relative humidity. They breed continuously throughout the year in heated buildings and mating occurs in the nest. Mature colonies contain several queens, winged males, workers, eggs, larvae, prepupae and pupae.

Pharaoh ants use pheromones as the primary means of communication.  Part of the colony migrates to a new location. Nests can be very small, located between sheets of paper, in clothing or laundry, furniture, foods, etc. Nests usually occur in wall voids, under floors, behind baseboards, in trash containers, under stones, in cement or stone wall voids, in linens, light fixtures, etc. They prefer dark, warm areas near hot water pipes and heating tapes, in bathrooms, kitchens, intensive care units, operating rooms, etc. They are "trail-making" ants and often are found foraging in drains, toilets, washbasins, bedpans and other unsanitary sites as well as in sealed packs of sterile dressing, intravenous drip systems, on surgical wounds, food and medical equipment.

Extermination

Pharaoh ants have been exterminated by placing baits, consisting of ground liver mixed with boric acid, (or borax), in places where the ants forage. (Honey, with 10% borax dissolved in - may need to warm it - also works well).  Renewing the baits once or twice may be necessary. It is recommended not to exterminate using sprays and dusts because they will cause the pharaoh ants to scatter."                           (Wiki..)

                                                                                                                                  

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