County treasurers of the several counties shall be the agents of the Commonwealth for the collecting and transmitting of money for the Commonwealth. Each county treasurer shall be entitled to deduct for the use of the county from the gross amount of moneys received by him for the use of the Commonwealth, on each separate account, he is required to keep and settle a commission in the following proportions, viz: where the whole sum accounted for and paid into the State Treasury, or otherwise, for the use of the Commonwealth, as directed by law, arising from either of the accounts specified in this act, does not exceed one thousand dollars, at the rate of five per cent; when it exceeds that sum and does not exceed two thousand dollars, one per cent for such excess over one thousand dollars; and on all beyond the sum of two thousand dollars, one-half of one per cent, except fees paid for fish, hunters, and dog licenses, which shall be the same as prescribed by law. Out of the commission deducted under the provisions of this section and the fees for issuing fish, hunters, and dog licenses, each county treasurer shall be entitled to retain for the use of the county for the collection and transmission of money under this act and any other acts of Assembly constituting county treasurers the agents of the Commonwealth for the collection and transmission of money, a sum equal to twenty per centum of the amount of his salary for acting as county treasurer as may now or hereafter be fixed and determined by law, and in addition thereto he shall be entitled to retain for the use of the county the amount of the premium or premiums on any bond or bonds which he is required to file in connection with the collection and transmission of money under this or any other act or acts of Assembly. County treasurers shall also be entitled to retain for the use of the county out of commissions received hereunder or out of fees for issuing fish, hunters, and dog licenses, amounts heretofore actually expended for premiums on bonds required by law to be filed for protection of the Commonwealth. All commissions heretofore or hereafter retained under the provisions of this act, and all fees for issuing fish, hunters, and dog licenses, shall be paid into the respective county treasuries.