. Economic entomology . seminulum. Copied from ^"P^°"^'''"'S'lTati ^"P'^'^^'^^"* Kolenati. o-oo2 Parisian metres in length. ^.^^^3 p^^.^.^^ .^^j^^^ j^ ^^^^^^^ Peplonyssus pagurus {Kolen., loc. cit. p. 78), Yellowish brown. On Rhinopoma microphyllum, GeofFr., iii Egypt. Genus Listrophorus {Pagenstecher). The Listrophori are another type of parasitic mites found upon small mammals. Claparede speaks as if they were confined to the rodents such as field mice, but it would appear not to be wholly so. We have specimens of Listrophorus gibbus from the ferret, and

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. Economic entomology . seminulum. Copied from ^"P^°"^'''"'S'lTati ^"P'^'^^'^^"* Kolenati. o-oo2 Parisian metres in length. ^.^^^3 p^^.^.^^ .^^j^^^ j^ ^^^^^^^ Peplonyssus pagurus {Kolen., loc. cit. p. 78), Yellowish brown. On Rhinopoma microphyllum, GeofFr., iii Egypt. Genus Listrophorus {Pagenstecher). The Listrophori are another type of parasitic mites found upon small mammals. Claparede speaks as if they were confined to the rodents such as field mice, but it would appear not to be wholly so. We have specimens of Listrophorus gibbus from the ferret, and another species from the polecat; and seeing that these beasts of prey must often feed on field mice, it is not very difficult to imagine that they may more or less frequently be invaded by their parasites. This genus furnishes a scarcely less remarkable instance of modification of structure to purpose than Myobia. In Listro- phorus the maxillae are transformed into two flexible shovels or

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