LA PAZ, Bolivia — A landslide caused by heavy rains after a prolonged drought in La Paz, the capital of Bolivia, flooded dozens of homes early Sunday, local authorities said. It swept away a young girl, spurred evacuations and left parts of the city without electricity. Torrential rain on Saturday caused a river to spill its banks, dislodging mud from a southwestern La Paz neighborhood where low-slung, shoddily built dwellings dot the hillside. The torrent of rocks and soil surged down a narrow ravine early Sunday, wrecking some two dozen homes and flooding another 40, said Juan Carlos Calvimontes, Bolivia’s