Abstract: This invention provides an insecticidal and miticidal agent which contains as an effective ingredient an oxazoline derivative represented by the formula ##STR1## wherein, R.sup.1 represents a fluorine atom, a chlorine atom, a C.sub.1 to C.sub.3 alkyl group or a C.sub.1 to C.sub.3 alkoxy group, andR.sup.2 represents a fluorine atom or a chlorine atom.The insecticidal and miticidal agent exhibits an excellent insecticidal and miticidal activity against harmful insects and mites parasitic on useful plants.

Abstract: An N-alkoxymethyl benzamide derivative represented by Formula (I); ##STR1## (In the formula, reference X indicates a halogen atom, references Y.sub.1 and Y.sub.2 indicate hydrogen atoms or halogen atoms, and may be identical or different, and reference R indicates a lower alkyl group.) and a manufacturing method for this N-alkoxymethyl benzamide derivative in which a substituted benzamide and an .alpha.-haloacetal are reacted. Furthermore, a manufacturing method for benzamide derivatives in which the N-alkoxymethyl benzamide derivative represented by Formula (I) above and benzene or a derivative thereof are reacted, and a benzamide derivative is produced. The N-alkoxymethyl benzamide derivative of the present invention is a novel compound, and possesses utility as an intermediate in the manufacturing of oxazoline derivatives which possess insecticidal and anti-mite activity, and as a starting material for the synthesis of various organic compounds and the like.