Picture of a brown recluse spider. Note the violin pattern on the cephalothorax and light-colored hairless abdomen. Picture of a brown recluse spider. Picture of a brown recluse spider head close-up. Generalized symptoms of bites from black widow and brown recluse spiders may include: 1  fever,  nausea,
Standard Mileage Rate Law and Legal Definition. The standard mileage rate (SMR), also known as mileage per diem, is the amount per mile that the Internal Revenue Service (IRS) allows small businesses and self-employed persons to use to calculate their vehicle expenses for tax deduction purposes.
1. (Units) Also called: statute mile a unit of length used in the UK, the US, and certain other countries, equal to 1760 yards. 1 mile is equivalent to 1.609 34 kilometres. 2. (Units) See nautical mile. 3. (Units) See Swedish mile.