The Calliphorid or blow flies are similar in general appearance to the common house fly, but they usually display metallic bodies of brilliant hues with colors such as blue, green, copper, and black (Fig. 5-53). The flies are called blow flies because the females hover over decaying flesh while they oviposit or larviposit, “blow”, eggs or larvae on the meat. Like the Sarcophagid flies, the Calliphorid flies are usually nonpathogenic species, most of which are important in that they feed on decaying animal tissue, but some species are important as facutative or primary myiasis producers.
Figure 5-53. A Calliphorid fly with the typical metallic body.