Good advice, however here in Aus we use a constriction bandage from the bite site up the entire limb to the trunk of the body. Check circulation of blood in the digits.

As Susan points out, lymph is transported in a separate system by the action of the large muscle groups, so the leg/arm is immobilised (even splinted) and the patient is sat or laid down for transport to medical help.

The injection site / wound is not washed or cut. The bite site is marked on the bandage. This is so the medics at the hospital can save that portion of the bandage and "type and match" any venom on the limb or the bandage, to give the correct antivenom/antivenin. This means you don't have to touch or even see the snake.

Remember also that you will rarely get two perfect puncture wounds, and a small scratch may be the only evidence of potential envenomation.

For ant bites I have always found a baking soda paste to be effective.