An affix (one of those already taught) comes after a word in the Locative -7th case, in the sense of 'done there', 'obtained there', 'bought there' and 'dexterous therein'.,
Thus स्रौघ्नः may mean \done in, or bought in, or obtained in, or skillful in Srughna\. So also the words माथुरः, राष्ट्रियः ॥,