Ectoparasitic insect pest controllers for animals and their usage

(Amended) An ectoparasitic insect pest controller for animals which contains, as active ingredient thereof, a hydrazine derivative represented by the following general formula (I):

• 11
• wherein A represents
• 12
• (in this formula, R4 represents a hydrogen atom or a C1-6alkyl group;
• X which may be the same or different represents one to five substituents selected from the group consisting of hydrogen atom, halogen atom, C1-6alkyl group and halo C1-6alkyl group);
• 13
• (in this formula, R4 and X are as defined above, and R5 represents a hydrogen atom, a C1-6alkylcarbonyl group or a phenylcarbonyl group which may optionally have one or two, the same or different substituents selected from C1-6alkyl groups);
• 14
• (in this formula, R4 and X are as defined above), or
• 15
• (in this formula, R4 and X are as defined above);
• R1 represents a hydrogen atom or a C1-6alkyl group;
• R2 and R3 which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C1-6alkyl group, a C1-6alkoxy group, a C1-6alkylcarbonyl group or a phenylcarbonyl group;
• Y which may be the same or different, represents one to five substituents selected from the group consisting of hydrogen atom, halogen atom, nitro group and cyano group;
• Z represents a halogen atom, a cyano group, a C1-6alkyl group, a halo C1-6alkyl group, a C1-6alkoxy group, a halo C1-6alkoxy group, a halo C1-6alkylthio group, a halo C1-6alkylsulfinyl group or a halo C1-6alkylsulfonyl group;
• and
• W represents an oxygen atom or a sulfur atom,
• provided that when A is
• 16
• then Y is not a hydrogen atom and 4-fluorine atom.