Resonance fluorescence series in the B1Π- X1Σ + band system of the isotopic lithium hydrides were observed for the first time. Six series of 7LiD and eight of 6LiH were excited by a frequency-doubled dye laser pumped by a frequency-doubled YAG laser. These observations have provided experimental data to compare with previous theoretical transition probabilities (W. T. Zemke, K. R. Way, and W. C. Stawalley, J. Chem. Phys.69, 402-408 (1978)). Excellent correspondences between the observed fluorescence intensities and the theoretical results have been realized.