Temperature and species mole fraction profiles were determined in atmospheric-pressure, premixed, laminar, flat flames of 1,1-C2H4Cl2and CH4under fuel-rich conditions at different Cl/H ratios. Samples were withdrawn from within the flame using a heated microprobe followed by gas analysis by on-line capillary gas chromatography-mass spectrometry (GC/MS). The mole fraction profiles were determined for all the reactants and for CO.CO2.HCl, H2O, H2.C2H6, C2H4, C2H2, CH3Cl, C2H3Cl, CH2CCl2, CH3CHClCH3, CH2CClCHCH2, C4H4, C4H2C6H6(benzene), and C10H8(napthalene). The role of these species, in view of the current ideas of the mechanism of combustion of 1,1-DCE is discussed and compared to earlier measurements made in l,2-C2H4C12flames.