On Fahrenholz's Purported New Species, Sub-Species and Varieties Of Pediculus

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Abstract
The object of this paper is to draw attention to certain grave sources of error underlying the present mode of differentiating Anoplura and more especially species of the sub-order Siphunculata. I am unable to say if the criticisms herewith advanced apply equally to the methods employed in differentiating members of the sub-order Mallophaga, because I am not familiar with the latter group, but the two sub-orders mentioned are in many respects so closely allied that it appears difficult to avoid the suspicion that the considerations herein contained may apply equally in both cases.

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