We have observed two new decay modes of the charmed baryon
Ξ
c
+ into
Σ
+
K
−
π
+ and
Σ
+
K
∗0
using data collected with the CLEO II detector. We also present the first measurement of the branching ...fraction for the previously observed decay mode
Ξ
c
+ →
ΛK
−
π
+
π
+. The branching fractions for these three modes relative to
Ξ
c
+ →
Ξ
−
π
+
π
+ are measured to be 1.18 ± 0.26 ± 0.17, 0.92 ± 0.27 ± 0.14, and 0.58 ± 0.16 ± 0.07, respectively.