Handbook of medical entomology . 89. Xenopsylla cheopis, male (x25). After Jordan and Rothschild. that fleas are the carriers of bubonic plague. Now over four hundredspecies are known. Of these, several species commonly attack most common hominoxious species are Pulex irritans, Xenopsyllacheopis, Ctenocephalus cams, Ctenocephalus felis, Ceratophyllusfasciatus and Dermatophilus penetrans, but many others will feedreadily on human blood if occasion arises. We shall treat in this place of the general biology and habits ofthe hominoxious forms and reserve for the systematic section thedisc
Handbook of medical entomology . 89. Xenopsylla cheopis, male (x25). After Jordan and Rothschild. that fleas are the carriers of bubonic plague. Now over four hundredspecies are known. Of these, several species commonly attack most common hominoxious species are Pulex irritans, Xenopsyllacheopis, Ctenocephalus cams, Ctenocephalus felis, Ceratophyllusfasciatus and Dermatophilus penetrans, but many others will feedreadily on human blood if occasion arises. We shall treat in this place of the general biology and habits ofthe hominoxious forms and reserve for the systematic section thediscussion of the characteristics of the different genera. I20 Parasitic Arthropoda. 90. Dog flea (xlo). After Howard. The most common fleas infesting houses in the Eastern UnitedStates are the cosmopoHtan dog and cat fleas, Ctenocephalus canis (fig. 90) and C. felis. Their lifecycles will serve as two species have untilrecently been considered as one,under the name Pulex figure 92. The eggs are oval, slightlytranslucent or pearly white, andmeasure about .5 mm. in theirlong diameter. They are de-posited loosely in the hairs ofthe host and readily drop off as the animal moves around. Howardfound that these eggs hatch in one to two days. The larvae areelongate, legless, white, worm-like creatures. They are exceed-ingly active, and avoid the light in every way possible. Theycast their first skin in from three to seven days and their secondin from three to four days. They commenced spinning in fromseven to fourteen days after hatching and the imago appearedfive days later. Thus in summer, at Washington, the entire lifecycle may be completed i
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