  We have investigated electrically-active magnetic excitations
(electromagnons) in perovskite manganites with the $E$-type (up-up-down-down)
spin structure by terahertz spectroscopy. Eu$_{1-x}$Y$_x$MnO$_3$ (0.1$\le
x\le$1) and Y$_{1-y}$Lu$_y$MnO$_3$ (0$\le y\le$1) without magnetic $f$-moments,
which host collinear sinusoidal, $A$-type, cycloidal, and $E$-type spin orders,
are used to examine the systematics of possible electromagnons. Three-peak
structures (23, 35, 45 cm$^{-1}$) of magnetic origin show up in the $E$-type
phase with little composition ($y$) dependence of frequencies, making a
contrast with the electromagnons observed in the cycloidal-spin ($x\le0.8$)
phases. One of these electromagnon is ascribed to the zone-edge magnon mode
based on the calculated magnon dispersions.
