MOSQUITOES AND FLIES
muscles. The true sucking organ lies within the head (Pmp), and does not differ in structure from that of other flies.
While our indictment of the flies has applied thus far only to the insects in the mature form, there are species which, though entirely innocent of any criminality in their
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Fig. 186. Head and mouth parts of the tsetse fly, Glossina
A, lateral view of the head and proboscis of Glossina fusca (from Vogel), showing the food canal (FC) inclosed by the labrum (Lm) and labium (Lb), and containing the tubular hypopharynx (Hphy) through which the saliva is injected into the wound
C, mouth parts of Glossina palpalis, with the parts of the proboscis separated. b, basal swelling of labium; La, the labella, or terminal lobes of the labium used for cutting into the skin of the victim; Lb, labium; Lm, labrum; Plp, maxillary papus (the maxillae are lacking); Pmp, mouth pump
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