Economic entomology for the farmer Economic entomology for the farmer and fruit-grower economicentomolo01smit Year: 1906 THE INSECT WORLD. 369 A louse-fly, Olfersia species. be aired until no trace of odor remains before fires are again introduced. The last family in the Diptcra to which we need call attention are the 'louse-flies,' or HippoboscidcB, frequently separated as a sub-order under the term Pupipara, the latter being applied because of the curious method of reproduction. The flies are parasites, living largely upon birds, but sometimes upon animals, and the egg not only develops
Economic entomology for the farmer Economic entomology for the farmer and fruit-grower economicentomolo01smit Year: 1906 THE INSECT WORLD. 369 A louse-fly, Olfersia species. be aired until no trace of odor remains before fires are again introduced. The last family in the Diptcra to which we need call attention are the 'louse-flies,' or HippoboscidcB, frequently separated as a sub-order under the term Pupipara, the latter being applied because of the curious method of reproduction. The flies are parasites, living largely upon birds, but sometimes upon animals, and the egg not only develops within the Fig. 424. body of the female, but the larva becomes nearly full-grown in the same position, and practically attains the pupa state before it is extruded. In these species the ab- domen is somewhat flat- tened and oval in form, of a thick, leathery con- sistency, with a very large anal opening, and from the circumstances of the case only one larva at a time is produced, so that the flies produce young only at considerable intervals. The whole body is depressed or flattened, and birds of prey are most usually affected. It is rare to find a hawk, eagle, or owl upon which several specimens of these peculiar flies cannot be found. They move about rapidly, and their first impulse is always to seek shelter when driven from their original host. Thus, in handling hawks that have just been shot, the flies frequently dart upon the hunter and make their way under his clothing and to his body. A few species are wingless, and among them is the so-called 'sheep-tick,' Melophagus ovinus, which is usually looked upon as a louse, and resembles one in the prominent proboscis, the lack of wings, and the strongly developed legs, on which the claws are very prominent. This 'sheep-tick' is the only troublesome species, and it can best be kept in check 24 Fig.
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