<P> Trombiculidae, from Greek τρομειν ("to tremble") and Latin culex, genitive culicis ("gnat" or "midge"), was first described as an independent family by Henry Ellsworth Ewing in 1944 . Then, when the family was first described, it included two subfamilies, Hemitrombiculinae and Trombiculinae . Womersley added another, Leeuwenhoekiinae, which at the time contained only Leeuwenhoekia . Later, he erected the family Leeuwenhoekiidae for the genus and subfamily, having six genera; they have a pair of submedian setae present on the dorsal plate . </P> <P> References to chiggers, however, go as far back as sixth - century China, and by 1733, the first recognition of trombiculid mites in North America was made . In 1758, Carl Linnaeus described a single species, Acarus batatas (now Trombicula batatas). However, most information about chiggers came from problems that arose during and after World War II . </P> <P> Trombiculid mites are found throughout the world . In Europe and North America, they tend to be more prevalent in the hot and humid regions . In the more temperate regions, they are found only during the summer (in French, harvest mites are called aoûtat because they are common in August). In the United States, they are found mostly in the southeast, the south, and the Midwest . They are not present, or barely found, in far northern areas, high mountains, and deserts . In the British Isles, the species Trombicula autumnalis is called harvest mites, in North America the species Trombicula alfreddugesi, and the species Trombicula (eutrombicula) hirsti which are found in Australia and are commonly called the scrub - itch mite . </P> <P> The length of the mite's cycle depends on species and environment but normally lasts two to 12 months . The number of cycles in a year depends on the region . For example, in a temperate region, there might only be three per year, but in tropical regions the cycle might be continuous all year long . Adult harvest mites winter in protected places such as slightly below the soil . Females become active in the spring, and once the ground temperature is regularly above 60 ° F (16 ° C), she lays eggs in vegetation, up to 15 eggs per day . The eggs are round and are dormant for about six days, after which the nonfeeding prelarvae emerge, with only three pairs of legs . After about six days, the prelarva grows into its larval stage . </P>

Where are chiggers found in the united states
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