In counties having a population of 150,000 and not more than 300,000, the sheriff shall appoint an under-sheriff, a chief deputy sheriff who shall be a competent accountant and shall keep the books of the office, and such number of deputy sheriffs as shall be fixed by resolution of the board of supervisors. The under-sheriff and the chief deputy sheriff in such counties shall each receive a salary of 2,000 dollars per year, payable monthly, in lieu of all fees or other compensation. The deputy sheriffs shall each receive a salary of 1,200 dollars per year, payable monthly, in lieu of all fees or other compensation. The board of supervisors in such counties may by resolution provide for increase in said salaries, when, in their judgment, deemed necessary.

     In counties having a population of more than 400,000, the sheriff shall appoint an undersheriff, who shall also be the chief deputy sheriff, and such number of deputy sheriffs, and other clerks and employees as may be fixed by the board of supervisors. The annual salary of the undersheriff inclusive of his duties as chief deputy sheriff, and the number of deputies, clerks and employees, and their annual salaries, shall be fixed by resolution of the board of supervisors, to be payable monthly in lieu of all fees or other compensation. The board of supervisors may provide that deputy sheriffs solely engaged in the service of civil process shall receive as compensation, fees for such service, in lieu of salary.