Parasitic flies

These stout flies are very variable in appearance. Many species look like bristly house flies (see p. 148), while some larger species can look almost beelike. The abdomen is especially bristly, particularly toward the rear end.

• life Cycle The larvae are mostly parasitic on insects. Eggs are laid either on the host, with the hatched larvae burrowing inside, or inside the host. Females of some species lay their eggs directly into the mouths of feeding insects or on plants that the hosts will eat.

• Occurrence Worldwide.

In a wide variety of habitats, wherever their hosts are found. j ,ARVAE arc white

• remark Many species arc ()r yellowish, perhaps used as biological control agents. with spines or hairs.

head appears much narrower than abdomen thick black spines or bristles on abdomen

A paradejeania rutieoides is found in northwestern parts of the [ IS. It attacks and parasitizes several different types of caterpillar.

formosia moneta is a stout fly with highly distinctive coloration. It attacks and parasitizes the larvae of scarab beetles (see pp. 128-29).

phas/a iiemiptera parasitizes shield bugs (see p.92). It is found in meadows and woodlands in parts of Europe, including the British Isles.

angular wings ™

bristles on body stout abdomen this species has a relatively hairless body brilliant blue and green markings

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