. Entomology for medical officers. Insect pests; Insects as carriers of disease. ORDER SIPHONAPTERA (APHANIPTERA) : FLEAS 195 ["Club of antenna incompletely segmented; only one antepygidial bristle on each side = Hoplopsyllus. I Club of antenna completely segmented; more than one ante- pygidial bristle on each side = Ceratophyllus. ("None of the abdominal terga with combs = 7. -] One or more of the abdominal terga with a comb I = Hystricopsylla. f Bristles of hind border of tibise not in a close-set row = 8. \ Bristles of hind border of tibiae in a close-set row =CtenopsyUa. [Last ta
. Entomology for medical officers. Insect pests; Insects as carriers of disease. ORDER SIPHONAPTERA (APHANIPTERA) : FLEAS 195 ["Club of antenna incompletely segmented; only one antepygidial bristle on each side = Hoplopsyllus. I Club of antenna completely segmented; more than one ante- pygidial bristle on each side = Ceratophyllus. ("None of the abdominal terga with combs = 7. -] One or more of the abdominal terga with a comb I = Hystricopsylla. f Bristles of hind border of tibise not in a close-set row = 8. \ Bristles of hind border of tibiae in a close-set row =CtenopsyUa. [Last tarsal segment of first and second legs with five lateral bristles on either side, of third legs with four = Neopsylla. I Last tarsal segment of first and second legs with four lateral bristles, of third legs with three = Ctenophthalmus. Genus Pulex, L. (Fig. 76). In this genus there are no combs on head and pronotum, the eyes are large, and there. Fig. 76.—Common Flea {PuUx irritans). is only one pair of antepygidial bristles. The best known species is the human flea, P. irritans, L., which is as cosmo- politan as its host, and also attacks other animals, including the rat. Its principal specific characters are as follows:— there is no transverse row of bristles on the head, each abdominal tergum has only one belt of bristles, the labial palps are long and are composed of 3 segments, and there are numerous teeth in an irregular row on the inner side of the hind coxa. Genus Xenopsylla, Glink. (Fig. 'jj'). This genus differs very slightly from Pulex, the chief distinction being the presence of an internal chitinous thickening that runs from the coxal articulation of the second leg upwards through the. 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 & Jackso
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