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“Larger and more clumsy in flight than house flies, these insects bumble about houses during the warm days of autumn and through out the winter. They come in through cracks around screens, louvres and eaves of buildings, especially on sunny exposures. Because attics are less carefully sealed large numbers may gather there. Clusters sometimes include thousands of flies,
“The cluster fly female lays single eggs in soil where earthworms are likely to be present. The maggot hatches and immediately enters the soil. It attacks the skin off an earthworm, burrows inside the body, and eats the internal organs of its host. The maggot feeds and grows for three to four weeks, generally killing the host. The fully grown larva leaves the worm and pupates beneath the surface of the soil. About a week later, the adult emerges to begin breeding activities. The total life cycle lasts 35 to 45 days. There may be from three to five generations per year.
“The cluster fly is most easily distinguished from other flies by a combination of features. There are no definite lines on the thorax, and the black hairs in this area are sprinkled with very fine yellow fleece. The abdomen has irregular Continued on page eight
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