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The seasonal occurrence of Ctenocephalides felis felis (Bouché ) and Ctenocephalides canis (Curtis) infestation on dogs and cats in Cuernavaca City in Mexico, was determined by examining 1,803 dogs and 517 cats at two veterinary clinics during 1995Ð1997. The overall ßea infestation was 30.3 and 30.1% for dogs and cats, respectively. There were no signiÞcant differences (P Ͼ 0.05) in percentage of infestation among years for both hosts. The infestation was somewhat higher in spring, summer, and autumn than in winter, but no statistical differences was found among seasons (P Ͼ 0.05) for both pets. No relationship existed between percentage of ßea infestation and temperature or rainfall among seasons. On dogs, 81.1% were infested with only C. felis felis, 16.8% with C. canis, and 2% had both ßea species; whereas 92.3% of the cats were infested with C. felis felis and 7.7% with C. felis felis and C. canis. The cat ßea was the most prevalent ßea species found other than C. canis; no other species were found on the dogs and cats. It appeared that ßea life cycle development continued throughout the year.

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