In Hungarian a town named Nagy Becskerek and official name now is Zrenjanin, Yugoslavia. German name of the village was Betscherek.
There were 102 KLEMENS that passed thru Ellis Island and there is a family of five Lorenz, Maria, Michal, Katharina, and Elisabeth that were from Ris Beiskerek ( Kis Becskerek on the manifest)/Kleinbetscherek aka Becicherecul-Mic, Romania. Any relation to your ancestor?
The old 1910 Hungarian megye map is at : http://lazarus.elte.hu/hun/maps/1910http://lazarus.elte.hu/hun/maps/1910 It seems that a village named Kisbecskerek is in Temes megye and in Romania and Nagybecskerek is in Torontal megye and in Yugoslavia.
The spelling Clementz seems German.
Romania's phone site is at : www.whitepages.roand the name KLEMENS lists in Timisoara,Leibling.
The town of Dubrovnik is in Croatia. www.dubrovnik.hr