. Entomology for medical officers. Insect pests; Insects as carriers of disease. 186 ENTOMOLOGY FOR MEDICAL OFFICERS but is generally flattened and broadly impacted or sunk against the thorax. The antennae are composed of a single segment, which is sunk in a pit on either side of the mouth, and bears a free bristle or a tuft of long hairs. The palpi are coarse and somewhat curved, and form a loose sheath for the proboscis when it is protruded. The proboscis, which is retractile, is much like that of Glossina, the labium consisting of a bulbous base and a slender shaft which forms a sheath for
. Entomology for medical officers. Insect pests; Insects as carriers of disease. 186 ENTOMOLOGY FOR MEDICAL OFFICERS but is generally flattened and broadly impacted or sunk against the thorax. The antennae are composed of a single segment, which is sunk in a pit on either side of the mouth, and bears a free bristle or a tuft of long hairs. The palpi are coarse and somewhat curved, and form a loose sheath for the proboscis when it is protruded. The proboscis, which is retractile, is much like that of Glossina, the labium consisting of a bulbous base and a slender shaft which forms a sheath for the acicular epipharynx and the filiform hypopharynx— these as in the Muscidea being the only mouth-parts, besides the palpi already mentioned, that are present. The thorax. Fio. 73.—Nycteribiid Fly from " Flying-fox " Bat. is flattened and strongly chitinised, its sterna being broad. The legs are, usually, not much elongated, but are stout and end in heavy and powerful claws ; these have the heel almost as prominent as the tip, and sometimes have a third cusp near the heel. The wings in some species are well developed, and have a venation quite like that of the Muscidea; in other cases the veins are incomplete and are a good deal crowded in the antero-internal part of the wing; in other cases again they are narrow, or short and narrow (vestigial); in Lipoptena they are, as the name implies, caducous, and in the " sheep- tick " {Melophagus) they are entirely wanting. The abdomen is a tough sack with no distinct segmentation. The HippoboscidcB are to be regarded as Muscidea nicely. 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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