Muhammad Zahid. (2011) A REWIEW OF CAYSTRINE SUBGROUP CAYSTRUS LANGEI BREDDIN (1899) WITH SPECIAL REFERENCE TO THE SPECIES DESCRIBED BY LINNAVUORI I.E., C. HIPPONAX, C. NIOKANUS AND C. PSEUDOBRUNNESCENS (HEMIPTERA: PENTATOMIDAE: PENTATOMINAE) FROM ETHIOPIAN AND PALAEARCTIC REGIONS, , Volume 08, Issue 1.