. Entomology for medical officers. Insect pests; Insects as carriers of disease. CHAPTER IX Order Diptera (continued): The Aschiza In the flies of this division (Fig. 47) the frontal lunule is often indistinct and the frontal suture is not present at all. The antennae are usually composed of 3 simple segments and an arista which is generally dorsal, rarely terminal. The 3rd longitudinal vein is not forked, and there are never more than three posterior cells in the wing. The empodia are not pulvilliform. .fronTalhnuh. Fio. 47.—Head of a Syrpliid Fly. Four families are here included; not one of
. Entomology for medical officers. Insect pests; Insects as carriers of disease. CHAPTER IX Order Diptera (continued): The Aschiza In the flies of this division (Fig. 47) the frontal lunule is often indistinct and the frontal suture is not present at all. The antennae are usually composed of 3 simple segments and an arista which is generally dorsal, rarely terminal. The 3rd longitudinal vein is not forked, and there are never more than three posterior cells in the wing. The empodia are not pulvilliform. .fronTalhnuh. Fio. 47.—Head of a Syrpliid Fly. Four families are here included; not one of the species sucks blood, and few of them are of any importance from the medical standpoint. Family SYRPHlD^iE, Hover-flies. Many of the species of this very large family are bright coloured, some of them resemble wasps and bees, and a few look like blue-bottles or green-bottles. They live on nectar and pollen, and are generally seen poised over or settled on flowers. The antennae consist of 3 segments, usually with a dorsal arista. Between the 3rd and 4th longitudinal veins, more or less parallel with them, and crossing the anterior cross-vein, a 14i. 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 Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
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