Given the patient's history and location on the scalp, these arthropods are most likely P. h. capitis, a.k.a. head lice. As pointed out by Olivier and Lee, we have both a male and female louse here - a nice pair! You can identify the male by its terminal (caudal) projecting spike-like aedeagus (reproductive organ), while the female has a terminal inward-facing 'notch' representing the opening to the reproductive tract.
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