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The head of Ctenocephalides sp is rounded on its upper and anterior surface. Ctenocephalide canis, the dog flea, has a sharp curve here; Ctenocephalides felis felis, the cat flea, has a shallow curve. Ctenocephalides canis usually has three or four setae on the metepisternum; the others species usually have only one or two.
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Between the postmedian and apical long setae on the trailing edge of the hind tibia of Ctenocephalides canis there are two notches bearing short, stout setae. All of the other species have only one notch that bears stout setae.