. Elementary entomology. Insects. 240 ELEMENTARY ENTOMOLOGY Some of the louse-flies (Hippoboscidae) are winged, though some of them cast off or bite off their wings, and are frequently found on birds of prey, while others are common on various birds and mammals. The bodies are very much flattened, the head is joined to the thorax broadly, the antennas con- sist of a single segment, and the wing-venation is very simple. The best- known example of the ^ wingless forms is the com- FIG. 381. A louse-fly (Olfersia sp.). (Enlarged) mon sheep-tick (Melopha- gus ovinus), which should be carefully dist
. Elementary entomology. Insects. 240 ELEMENTARY ENTOMOLOGY Some of the louse-flies (Hippoboscidae) are winged, though some of them cast off or bite off their wings, and are frequently found on birds of prey, while others are common on various birds and mammals. The bodies are very much flattened, the head is joined to the thorax broadly, the antennas con- sist of a single segment, and the wing-venation is very simple. The best- known example of the ^ wingless forms is the com- FIG. 381. A louse-fly (Olfersia sp.). (Enlarged) mon sheep-tick (Melopha- gus ovinus), which should be carefully distinguished from the true ticks (belonging to the Arachnida), and which is the only troublesome member of the family. A nearly related family (Nycteribiidae), look- ing like small spiders, are known as bat-ticks and are even more degenerate in structure. The third family (Braulidae) consists of a single spe- cies, the bee-louse, a minute insect about one six-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882. Boston, New York [etc. ] Ginn and Company
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