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The cluster flies are the genus ''Pollenia'' in the blowfly family Calliphoridae. Unlike more familiar blow flies, such as the bluebottle genus ''Phormia'', they do not present a health hazard because they do not lay eggs in human food. They are strictly parasitic on earthworms; the females lay their eggs near earthworm burrows, and the larvae then infest the worms. However, the flies are a nuisance; when the adults emerge in the late summer or autumn, they enter houses to hibernate, often in large numbers; they are difficult to eradicate because they favour inaccessible spaces such as roof and wall cavities. They are often seen on windows of little-used rooms. They are also sometimes known as attic flies. The typical cluster fly ''Pollenia rudis'' is about 7 mm long and can be recognised by distinct lines or stripes behind the head, short golden-coloured hairs on the thorax, and irregular light and dark gray areas on the abdomen. Cluster flies are typically slow-moving. Cluster flies have a widespread distribution. Eight species are found in Britain and 31 in Europe. ''Pollenia'' species are also numerous in Australia and New Zealand (over 30 species); they are a common pest in North America. ''P. rudis'' has spread widely in association with humans. ==Species== *''P. amentaria'' (Scopoli 1763) *''P. angustigena'' Wainwright 1940 *''P. atramentaria'' (Meigen 1826) *''P. bezziana'' Rognes 1992 *''P. bicolor'' Robineau-Desvoidy 1830 *''P. bulgarica'' Jacentkovsky 1939 *''P. contempta'' Robineau-Desvoidy 1863 *''P. dasypoda'' Portschinsky 1881 *''P. fulvipalpis'' Macquart 1835 *''P. griseotomentosa'' (Jacentkovsky 1944) *''P. hungarica'' Rognes 1987 *''P. labialis'' Robineau-Desvoidy 1863 *''P. leclercqiana'' (Lehrer 1978) *''P. luteovillosa'' Rognes 1987 *''P. mayeri'' Jacentkovsky 1941 *''P. mediterranea'' Grunin 1966 *''P. moravica'' (Jacentkovsky 1941) *''P. paupera'' Róndani 1862 *''P. pectinata'' Grunin 1966 *''P. pediculata'' Macquart 1834 *''P. ponti'' Rognes 1991 *''P. pseudintermedia'' Rognes 1987 *''P. pseudorudis'' Rognes, 1985 *''P. rudis'' (Fabricius 1794) *''P. ruficrura'' Róndani 1862 *''P. similis'' (Jacentkovsky 1941) *''P. tenuiforceps'' Róndani 1928 *''P. vagabunda'' (Meigen 1826) *''P. venturii'' Zumpt 1956 *''P. vera'' Jacentkovsky 1936 *''P. verneri'' Rognes 1992 *''P. viatica'' Robineau-Desvoidy 1830 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cluster fly」の詳細全文を読む スポンサード リンク
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