Composition and method for controlling harmful arthropods

A composition for controlling harmful arthropods comprising an amide compound represented by a formula (I);

• wherein
• n is 3 or 4;
• R1 represents a hydroxy group, an amino group or a C1-C6 alkoxy group;
• R2 represents an optionally substituted phenyl group, an optionally substituted 1-naphthyl group or an optionally substituted 3-indolyl group, and the phenyl group, the 1-naphthyl group or the 3-indolyl group being represented by the R2 may be substituted on the carbon atoms independently of each other with one or more substituents selected from a halogen atom, a hydroxy group, a nitro group, a C1-C6 alkyl group or a C1-C6 alkoxy group;
• or salts thereof and
• at least one kind of neonicotinoid compounds selected from the group (A) consisting of imidacloprid, clothianidin, thiamethoxiam, dinotefuran, acetamiprid, thiacloprid and nitenpyram.