diff --git a/libsrc/core/mpi_wrapper.hpp b/libsrc/core/mpi_wrapper.hpp
index da5df796..c1fc47dd 100644
--- a/libsrc/core/mpi_wrapper.hpp
+++ b/libsrc/core/mpi_wrapper.hpp
@@ -174,10 +174,10 @@ namespace ngcore
     }
 
     template<typename T, typename T2 = decltype(GetMPIType<T>())> 
-    MPI_Request IRecv (T & val, int src, int tag) const
+    MPI_Request IRecv (T & val, int dest, int tag) const
     {
       MPI_Request request;
-      MPI_Irecv (&val, 1, GetMPIType<T>(), src, tag, comm, &request);
+      MPI_Irecv (&val, 1, GetMPIType<T>(), dest, tag, comm, &request);
       return request;
     }
     
@@ -227,6 +227,16 @@ namespace ngcore
       MPI_Bcast (&s[0], len, MPI_CHAR, root, comm);
     }
 
+    NgMPI_Comm SubCommunicator (FlatArray<int> procs) const
+    {
+      MPI_Comm subcomm;
+      MPI_Group gcomm, gsubcomm;
+      MPI_Comm_group(comm, &gcomm);
+      MPI_Group_incl(gcomm, procs.Size(), procs.Data(), &gsubcomm);
+      MPI_Comm_create_group(comm, gsubcomm, 4242, &subcomm);
+      return NgMPI_Comm(subcomm, true);
+    }
+
   }; // class NgMPI_Comm
 
   NETGEN_INLINE void MyMPI_WaitAll (FlatArray<MPI_Request> requests)
@@ -313,15 +323,7 @@ namespace ngcore
 
 #endif // PARALLEL
 
-
-
-
-
-
-  
-
-  
-}
+} // namespace ngcore
 
 #endif // NGCORE_MPIWRAPPER_HPP
 
diff --git a/libsrc/general/mpi_interface.hpp b/libsrc/general/mpi_interface.hpp
index 08a15662..b7de6d64 100644
--- a/libsrc/general/mpi_interface.hpp
+++ b/libsrc/general/mpi_interface.hpp
@@ -94,21 +94,6 @@ namespace netgen
   template <class T> inline MPI_Datatype MyGetMPIType ( ) { return 0; }
 #endif
 
-#ifdef PARALLEL
-  inline MPI_Comm MyMPI_SubCommunicator(MPI_Comm comm, NgArray<int> & procs)
-  {
-    MPI_Comm subcomm;
-    MPI_Group gcomm, gsubcomm;
-    MPI_Comm_group(comm, &gcomm);
-    MPI_Group_incl(gcomm, procs.Size(), &(procs[0]), &gsubcomm);
-    MPI_Comm_create_group(comm, gsubcomm, 6969, &subcomm);
-    return subcomm;
-  }
-#else
-  inline MPI_Comm MyMPI_SubCommunicator(MPI_Comm comm, NgArray<int> & procs)
-  { return comm; }
-#endif
-
 #ifdef PARALLEL
   enum { MPI_TAG_CMD = 110 };
   enum { MPI_TAG_MESH = 210 };
diff --git a/libsrc/meshing/python_mesh.cpp b/libsrc/meshing/python_mesh.cpp
index 3e55ff75..dc28bab1 100644
--- a/libsrc/meshing/python_mesh.cpp
+++ b/libsrc/meshing/python_mesh.cpp
@@ -88,13 +88,12 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
     .def("Min", [](NgMPI_Comm  & c, size_t x) { return MyMPI_AllReduceNG(x, MPI_MIN, c); })
     .def("Max", [](NgMPI_Comm  & c, size_t x) { return MyMPI_AllReduceNG(x, MPI_MAX, c); })
     .def("SubComm", [](NgMPI_Comm & c, std::vector<int> proc_list) {
-        NgArray<int> procs(proc_list.size());
+        Array<int> procs(proc_list.size());
         for (int i = 0; i < procs.Size(); i++)
-          procs[i] = proc_list[i];
+          { procs[i] = proc_list[i]; }
         if (!procs.Contains(c.Rank()))
-          throw Exception("rank "+ToString(c.Rank())+" not in subcomm");
-	MPI_Comm subcomm = MyMPI_SubCommunicator(c, procs);
-	return NgMPI_Comm(subcomm, true);
+          { throw Exception("rank "+ToString(c.Rank())+" not in subcomm"); }
+	return c.SubCommunicator(procs);
       }, py::arg("procs"));
   ;