. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Revision of the Bombyliidae (Diptera) of Southern Africa. 17 packets of locusts, those of some Anthracinae destroy the larvae of solitary bees, fossorial wasps, and even beetles, and those of Exopro- sopinae are parasitic on the larvae of Hymenoptera, Diptera, Lepid- optera, Orthoptera, and even Coleoptera. Some species of Bombyliidae are thus of economic importance in that they parasitise species of insects which are injurious to man or his crops. Two species of Systoechus in South Africa have bee
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. A Revision of the Bombyliidae (Diptera) of Southern Africa. 17 packets of locusts, those of some Anthracinae destroy the larvae of solitary bees, fossorial wasps, and even beetles, and those of Exopro- sopinae are parasitic on the larvae of Hymenoptera, Diptera, Lepid- optera, Orthoptera, and even Coleoptera. Some species of Bombyliidae are thus of economic importance in that they parasitise species of insects which are injurious to man or his crops. Two species of Systoechus in South Africa have been proved to parasitise the egg- packets of the brown trek locust (Locustana pardalina), and, from an economic point of view, these insects may prove to be important agents in controlling this locust to a limited extent. Species of Thyridanthrax have also been bred from Tsetse Flies (Glossina), and species of Villa from destructive caterpillars. From complete life histories that have been worked out in other parts of the world it appears that the eggs. Text-fig. 4.—First instar of a Bombyliid larva (semidiagrammatic from Uvarov and after Portchinsky). are laid or deposited in the ground near or in the nest of the host, and in many cases it appears that the hatched first instar has to make its way into the egg-packet or nest of the host. The larva probably passes through at least two or three instars before it pupates. The first instar or newly hatched larva of some forms (cf. text-fig. 4 of a Bombylius (semidiagrammatic from Uvarov and after Portchinsky)) is, according to Chapman (Ent. Month. Mag. xiv, 1878, p. 196), Portchinsky (Dept. Agric. St Petersb., 1895, vide "Locusts and Grass- hoppers," p. 109, Uvarov, 1928), and Nielsen (p. 647, Zool. Jahrb., Bd. xviii, 1903), an active triungulin type, provided with three pairs of bristles instead of legs on the thorax and also a pair of terminal bristles by means of which it can move very rapidly and find its food. Accord
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